stdeb - Python to Debian source package conversion utility
I would like to announce the initial public release of stdeb, which may
be found at http://stdeb.python-hosting.com/ . The rest of this post is
copied directly from that web-page.
stdeb - Python to Debian source package conversion utility
==
stdeb_ (setuptools debian) produces Debian source packages from
Python packages via a new distutils command, ``sdist_dsc``, which
produces a Debian source package of a Python package. Automatic
defaults are provided for the Debian package, but many aspects of the
resulting package can be customized via a configuration file.
.. _stdeb: http://stdeb.python-hosting.com/
News
2006-06-19: Version 0.1 Released. See the `download page`_.
Invocation
--
All methods eventually result in a call to the ``sdist_dsc`` distutils
command. You may prefer to do so directly::
python -c import stdeb; execfile('setup.py') sdist_dsc
Alternatively, two scripts are provided::
stdeb_run_setup [options] # calls python setup.py sdist_dsc [options]
py2dsc [options] mypackage-0.1.tar.gz # uses pre-built Python source
package
In all cases, a Debian source package is produced from unmodified
Python packages. The following files are produced:
* ``packagename_versionname.orig.tar.gz``
* ``packagename_versionname-debianversion.dsc``
* ``packagename_versionname-debianversion.diff.gz``
These can then be compiled into binary packages using the standard
Debian machinery (e.g. dpkg-buildpackage).
Download
Files are available at the `download page`_.
.. _download page: http://stdeb.python-hosting.com/wiki/Download
The subversion repository is available at
https://svn.stdeb.python-hosting.com/trunk
Background
--
For the average Python package, its source distribution
(python_package.tar.gz created with ``python setup.py sdist``)
contains nearly everything necessary to make a Debian source
package. This near-equivalence encouraged me to write this little
distutils extension, which executes the setup.py file to extract
relevant information. This process is made significantly easier
through the use of setuptools_.
.. _setuptools: http://peak.telecommunity.com/DevCenter/setuptools
setuptools is used because of the opportunities it provides, although
many of these features are currently un(der)-utilized. For example,
setuptools could make the job of Debianizing python console and gui
scripts much easier.
I wrote this initially to Debianize several Python packages of my own,
but I have the feeling it could be generally useful. It appears
similar, at least in theory, to easydeb_ and `Logilab's Devtools`_.
.. _easydeb: http://easy-deb.sourceforge.net/
.. _Logilab's DevTools: http://www.logilab.org/projects/devtools
Prerequisites
-
* Python_ 2.3 or greater
* setuptools_
* subprocess.py_ (included with Python 2.4, backwards compatible with
Python 2.3)
.. _Python: http://www.python.org/
.. _subprocess.py:
http://svn.python.org/view/python/trunk/Lib/subprocess.py?rev=46651view=log
Customizing the produced Debian source package
--
stdeb will attempt to provide reasonable defaults, but these are only
guesses.
To customize the Debian source package produced, you may write config
files of the format understood by ConfigParser_. When building each
package, stdeb looks for the existance of a ``stdeb.cfg`` file in the
``.egg-info`` directory. You may specify an additional config file
with the command-line option --extra-cfg-file.
.. _ConfigParser: http://docs.python.org/lib/module-ConfigParser.html
Here's an example .cfg file which builds several packages::
[DEFAULT]
Debian-Version: 0ads1
[setuptools]
Source: python-setuptools
[numpy]
Source: python-numpy
Upstream-Version-Prefix: 0.9.8+
Build-Depends: python-dev, refblas3-dev, lapack3-dev
Build-Conflicts: atlas3-base, atlas3-base-dev
[matplotlib]
# matplotlib doesn't incorporate its SVN version number into
sdist-built tarballs.
# Therefore, if building the SVN version, substitute the version into the
# Upstream-Version-Suffix variable and use py2dsc.
# (For some reason, debuild -sa won't build matplotlib because tk.h
isn't found.)
Source: python-matplotlib
Upstream-Version-Suffix: .dev2500
Build-Depends: python-dev, python-numpy, python-numarray,
python-numeric, python-gtk2-dev, tk8.4-dev, libwxgtk2.4-dev
Depends: python-gtk2, python-numpy, python-numeric, python-numarray
Suggests: gs-gpl
[scipy]
Source: python-scipy
Upstream-Version-Prefix: 0.4.9+
Build-Depends: python-numpy
Depends: python-numpy
.. _numpy: http://scipy.org/NumPy
Using stdeb on stdeb
There is a chicken-and-egg problem when trying to make a Debian
package of stdeb with stdeb. Here's a recipe to avoid it::
# in the stdeb distribution directory (with setup.py)
python setup.py sdist
python setup.py build
PYTHONPATH=build/lib python stdeb/py2dsc.py dist/stdeb-VERSION.tar.gz
Pydev 1.2.0 Released
Hi All, Pydev and Pydev Extensions 1.2.0 have been released Details on Pydev Extensions: http://www.fabioz.com/pydev Details on Pydev: http://pydev.sf.net Details on its development: http://pydev.blogspot.com Release Highlights in Pydev Extensions: - - This is the first version supporting Eclipse 3.2. - Interactive console: content is now changed so that blocks are closed with the interactive interpreter 'rules' (so that you don't have invalid syntax errors when passing code-blocks to the interactive console). - An action was added to the menu so that you can use the Open Declaration Quick-outline without needing focus on the pydev editor. Release Highlights in Pydev: -- - Eclipse 3.2 supported (and 3.1 support is now discontinued) - Lot's of optimizations to make pydev faster - Ctrl+Click now works with the find definition engine - Comments that start with #--- are shown in the outline - Attributes are shown in the outline - Parse errors are now shown (again) in the editor - Many other bugs fixed What is PyDev? --- PyDev is a plugin that enables users to use Eclipse for Python and Jython development -- making Eclipse a first class Python IDE -- It comes with many goodies such as code completion, syntax highlighting, syntax analysis, refactor, debug and many others. Cheers, -- Fabio Zadrozny -- Software Developer ESSS - Engineering Simulation and Scientific Software http://www.esss.com.br Pydev Extensions http://www.fabioz.com/pydev Pydev - Python Development Enviroment for Eclipse http://pydev.sf.net http://pydev.blogspot.com -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
The First Pune Python meet is scheduled on 24th June.
The First Pune Python meet organized by PythonThreads.com is scheduled on 24th June. The main purpose of the meet is to introduce Python to the developers and encourage them to use it in their daily tasks also to raise the acceptance level of the non-Python developers by introducing them to the Python world. Python is used everywhere in almost all the sectors, however its not yet popular in this part of the world (India) . Considering the growing importance of scripting languages like Python, awareness of Python is today a must for even non-Python developers. There are very few groups in India (like Bangpypers) who are working with great efficiency and contributing in the growth of Python. We are planning to conduct the Python meets on every last Saturday of each month, it will help in spreading the Python language in Pune and across the country. We are targeting the Pune based software developers, freshers in the IT sector for this meet. In this meet we will introduce Python, its strengths, scope, in which sectors it can be implemented also an open discussion on Python. IndicThreads.com Java meets are held on the last Saturday of each month. The Python meets are also expected to follow the same schedule. Sandeep Gohad will speak on the basics of the Python language, sectors in which Python is being used and about using and promoting Python. His session will be followed by an open discussion on Python. Date and Time: Saturday, 24th June 2006 4.30 pm - 6.00 pm: Java Server Faces session - By Swarraj Kulkarni 6.00 pm - 7.00 pm: PythonThreads.com Pune Python Meet - Introduction To Python - By Sandeep Gohad. Venue: Symbiosis Institute of Computer Studies and Research (SICSR), 7th floor, Atur Center, Model Colony, Pune (Event supported by SICSR) * Entry is free of cost. Entry on first come first served basis. *Please share the meet details or this file on your college / company mailing lists or notice boards so that others could also benefit.* -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
[ANN] PyYAML-3.03: YAML parser and emitter for Python
Announcing PyYAML-3.03
A new bug-fix release of PyYAML is now available:
http://pyyaml.org/wiki/PyYAML
Changes
===
* Fix Python 2.5 compatibility issues.
* Fix numerous bugs in the float handling.
* Fix scanning some ill-formed documents.
* Other minor fixes.
Resources
=
PyYAML homepage: http://pyyaml.org/wiki/PyYAML
PyYAML documentation: http://pyyaml.org/wiki/PyYAMLDocumentation
TAR.GZ package: http://pyyaml.org/download/pyyaml/PyYAML-3.03.tar.gz
ZIP package: http://pyyaml.org/download/pyyaml/PyYAML-3.03.zip
Windows installer: http://pyyaml.org/download/pyyaml/PyYAML-3.03.win32.exe
PyYAML SVN repository: http://svn.pyyaml.org/pyyaml
Submit a bug report: http://pyyaml.org/newticket?component=pyyaml
YAML homepage: http://yaml.org/
YAML-core mailing list: http://lists.sourceforge.net/lists/listinfo/yaml-core
About PyYAML
YAML is a data serialization format designed for human readability and
interaction with scripting languages. PyYAML is a YAML parser and
emitter for Python.
PyYAML features a complete YAML 1.1 parser, Unicode support, pickle
support, capable extension API, and sensible error messages. PyYAML
supports standard YAML tags and provides Python-specific tags that allow
to represent an arbitrary Python object.
PyYAML is applicable for a broad range of tasks from complex
configuration files to object serialization and persistance.
Example
===
import yaml
yaml.load(
... name: PyYAML
... description: YAML parser and emitter for Python
... homepage: http://pyyaml.org/wiki/PyYAML
... keywords: [YAML, serialization, configuration, persistance, pickle]
... )
{'keywords': ['YAML', 'serialization', 'configuration', 'persistance',
'pickle'], 'homepage': 'http://pyyaml.org/wiki/PyYAML', 'description':
'YAML parser and emitter for Python', 'name': 'PyYAML'}
print yaml.dump(_)
name: PyYAML
homepage: http://pyyaml.org/wiki/PyYAML
description: YAML parser and emitter for Python
keywords: [YAML, serialization, configuration, persistance, pickle]
Copyright
=
The PyYAML module is written by Kirill Simonov [EMAIL PROTECTED].
PyYAML is released under the MIT license.
--
http://mail.python.org/mailman/listinfo/python-announce-list
Support the Python Software Foundation:
http://www.python.org/psf/donations.html
Re: Change value of element in list
Hi, I'm doing python tutorial, http://docs.python.org/tut/node5.html and I have these, lists = ['spam', 'eggs', 100, 1234] lists[2] = lists[2] + 23 I expected this, lists = ['spam', 'eggs', 123, 1234] but got this, lists = ['spam', 'eggs', 100, 1234] What's my problem here ? I have Fedora C5 with python2.4. Thanks. O Plameras Don't think so Microsoft Windows XP [version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:\Documents and Settings\Administrateurpython Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32 Type help, copyright, credits or license for more information. list=['spam','egg',100,1234] list ['spam', 'egg', 100, 1234] list[2]=list[2]+23 list[2] 123 list ['spam', 'egg', 123, 1234] Rony -- --- Rony Steelandt BuCodi rony dot steelandt (at) bucodi dot com Visit the python blog at http://360.yahoo.com/bucodi -- http://mail.python.org/mailman/listinfo/python-list
Re: aligning SGML to text
Steven Bethard wrote: Gerard Flanagan wrote: Steven Bethard wrote: I have some plain text data and some SGML markup for that text that I need to align. (The SGML doesn't maintain the original whitespace, so I have to do some alignment; I can't just calculate the indices directly.) For example, some of my text looks like: [...] Steve This is probably an abuse of itertools... [snip hammering] Thanks for taking a look. Yeah, the alignment's a big part of the problem. It'd be really nice if the thing that gives me SGML didn't add whitespace haphazardly. ;-) STeVe I see, the problem was different than I thought. When all you have is a hammer... :-) Gerard -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython GUI designer
[EMAIL PROTECTED] a écrit : I am newbie learning wxPython. I tried using GUI designer called wxGlade. When it generated code I couldnt get the same level of flexibility as writing the code by oneself. Any view on what you think about using GUI designer tools. Every help is appreciated. Boa is excellent if you stay at a primary level. It's a visual design tool, and it can help you to learn how to manage wx classes. It works on windows and linux as well. My understanding of wxglade is that you need skills about sizers to be confident with it. So if you know how to use sizers, you don't really need a tool. Regards, jm -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython GUI designer
I am newbie learning wxPython. I tried using GUI designer called wxGlade. When it generated code I couldnt get the same level of flexibility as writing the code by oneself. Any view on what you think about using GUI designer tools. Every help is appreciated. Boa is excellent if you stay at a primary level. It's a visual design tool, and it can help you to learn how to manage wx classes. It works on windows and linux as well. My understanding of wxglade is that you need skills about sizers to be confident with it. So if you know how to use sizers, you don't really need a tool. Regards, jm I use wxDesigner -- --- Rony Steelandt BuCodi rony dot steelandt (at) bucodi dot com Visit the python blog at http://360.yahoo.com/bucodi -- http://mail.python.org/mailman/listinfo/python-list
Re: any subway web dev experiences
a wrote:
subway is pythons ruby on rails competitor
Nope - it's a Python MVC web framework. Like Django, Pylons and
Turborgears. And FWIW, there have been recently some discussions about
merging Subway and Turbogears.
pls tell me if u hav any expereinces
Please take time to learn and write readable english sentences.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Raffael Cavallaro [EMAIL PROTECTED]'espam-s'il-vous-plait-mac.com writes: This is purely a matter of programming style. For explorative programming it is easier to start with dynamic typing and add static guarantees later rather than having to make decisions about representation and have stubs for everything right from the start. I think you are confusing static typing with having to write types everywhere. With type inference, you only have to write a minimum of type information (such as datatype declarations), so you can easily do explorative progrmming in such languages -- I don't see any advantage of dynamic typing in this respect. The lisp programming style is arguably all about using heterogenous lists and forward references in the repl for everything until you know what it is that you are doing, then choosing a more appropriate representation and filling in forward references once the program gels. Having to choose representation right from the start and needing working versions (even if only stubs) of *every* function you call may ensure type correctness, but many programmers find that it also ensures that you never find the right program to code in the first place. If you don't have definitions (stubs or complete) of the functions you use in your code, you can only run it up to the point where you call an undefined function. So you can't really do much exploration until you have some definitions. I expect a lot of the exploration you do with incomplete programs amount to the feedback you get from type inference. This is because you don't have the freedom to explore possible solutions without having to break your concentration to satisfy the nagging of a static type checker. I tend to disagree. I have programmed a great deal in Lisp, Scheme, Prolog (all dynamically typed) and SML and Haskell (both statically typed). And I don't find that I need more stubs etc. in the latter. In fact, I do a lot of explorative programming when writing programs in ML and Haskell. And I find type inference very helpful in this, as it guides the direction of the exploration, so it is more like a safari with a local guide than a blindfolded walk in the jungle. Torben -- http://mail.python.org/mailman/listinfo/python-list
Re: Python is fun (useless social thread) ;-)
bruno at modulix wrote: Or did you just like what you saw and decided to learn it for fun? Well, I haven't be really impressed the first time - note that it was at the very end of the last century, with v1.5.2. 1.5.2 was an excellent version. Not really that different in use than current version. -- hilsen/regards Max M, Denmark http://www.mxm.dk/ IT's Mad Science Phone: +45 66 11 84 94 Mobile: +45 29 93 42 96 -- http://mail.python.org/mailman/listinfo/python-list
Re: [OT] code is data
Anton Vredegoor wrote:
With the inclusion of ElementTree (an XML-parser) in Python25 and recent
developments concerning JSON (a very Pythonesque but somewhat limited
XML notation scheme, let's call it statically typed XML)
JSON stands for JavaScript Object Notation, and has *nothing* to do with
XML - except for the fact that it's more and more used instead of XML
for AJAX stuff.
Python seems to
have reached a stage where it now seems to be possible to completely
swallow lesser languages code, modify it, and spit out new source code
targeting the original language the code was written in, or even make a
translation to other languages.
If you mean parsing source in a given format and outputting another -
modified or not - representation, in the same or another format, Python
as always been able to do so.
The idea is that we now have a fast parser (ElementTree) with a
reasonable 'API' and a data type (XML or JSON) that can be used as an
intermediate form to store parsing trees. Especially statically typed
little languages seem to be very swallow-able. Maybe I will be able to
reimplement GFABasic (my first love computer language, although not my
first relationship) someday, just for fun.
Then there are things like cTypes (calling functions from native DLL's)
and PyPy (implementing Python in Python).
All this taken together, to me it starts looking like we're now entering
a territory that traditionally was exclusively in the Lisp domain.
Sorry, but I just don't get the point. Parsing, working with trees and
calling native code are in no way exclusively in the Lisp domain.
Yes, Python had eval and exec for a long time already, and metatypes and
generators are having some strange unexplored possibilities too, but the
day will come soon (and at last when PyPy is reaching execution speeds
close to cPython) where Python will be able to swallow smaller
languages, and finally it will be able to swallow its own tail, like
Lisp but then more powerful
I'm afraid Python is still very far from Lisp - and will never get there
(FWIW, this seems not to be the goal anyway).
(because of the widely used standard data
types and the code exchange between languages that that makes possible).
I still don't get the point.
Your thoughts please.
Anton
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: code is data
BJörn Lindqvist wrote:
Personally, I would like to see macros in Python (actually Logix
succeeding is good enough). But I am no language designer and the
community has no interest in it. When I absolutely need macros, I will
go elsewhere.
One must wonder, when is that? When do you absolutely need macros?
One must wonder, when do you absolutely need HOFs, closures, OO,
functions, or even structured programming. All we 'absolutely' need is
tests and gotos... (and love, of course !-).
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: code is data
Ravi Teja wrote:
BJörn Lindqvist wrote:
Personally, I would like to see macros in Python (actually Logix
succeeding is good enough). But I am no language designer and the
community has no interest in it. When I absolutely need macros, I will
go elsewhere.
One must wonder, when is that? When do you absolutely need macros?
Whenever there is significant boiler plate code that functions and
classes cannot eliminate alone.
Whenever there is a more elegant way to express your code.
Python 2.5 introduced conditional expressions and with statement. With
macros, one would not have to wait for the language team to implement
them. More so for features which only a small part of the community has
an interest in.
I *like* 1..5 (ada, ruby) instead of range(5). If I had macros, I would
have done it myself for *my* code.
And that's the downside with macros - and with anything that's not
officially part of the language or it's standard lib : everybody
implements it it's own way, and you end up with dozens non-standard ways
of doing the same thing.
Not to say this is absolutely bad, but there's a balance to be found
here. One could do function decorators long before we had official
syntactic sugar for it, but it only started to be a common idiom with
the @decorator syntax. Python 2.5 introduces a 'partial' type, that is
quite easy to implement with 2.4 (and probably with older versions too),
but having it in the builtins or standard lib means it will become the
standard way to do it - no need to deal with half a dozen half-backed
implementations of it no more.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: any subway web dev experiences
bruno at modulix wrote: Nope - it's a Python MVC web framework. Like Django, Pylons and Turborgears. And FWIW, there have been recently some discussions about merging Subway and Turbogears. recently? was that before or after the developer picked up his marbles and went home to complain to his mother? (according to the subway wiki, only porn sites use the framework these days. hint to developers: if you're shutting down a project, make sure you lock down the project site). /F -- http://mail.python.org/mailman/listinfo/python-list
Check if a file is closed
How to check if a file is closed? On Win32 you can call CreateFile with write and share write and if it raises an error, the file is closed. How to do it in Python??? Thanks, Camillo -- http://mail.python.org/mailman/listinfo/python-list
Re: code is data
Ravi Teja wrote:
(snip)
Annoted variables, symbols and code
layout visually cue more efficiently to the object nature than do
explicit text definitions. Of course, this is only sensible when there
aren't too many of any of those. In that case, the cognitive cost of
notation outweighs the representational cost of text.
Representational minimalism is troublesome in general code (ala Perl),
but not so in a DSL where the context is constrained.
This still impose the need to learn a new language.
I would also like to symbolize field types since they occur so commonly
in a definition file and only a few of them are commonly used. I admit
though that I find the code below a bit visually jarring and I might
use something else. But it serves to illustrate the point. I chose the
respective symbols based on their colloquial use and association with
the field types.
@Poll:
$question: length 200
%pub_date('date published')
@Choice:
poll - Poll
$choice: length 200
#votes
IMHOYuck/IMHO.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: Tetris
pygame.org is what you need it has tutorials it's cool -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Torben Ægidius Mogensen wrote: Rob Thorpe [EMAIL PROTECTED] writes: Torben Ægidius Mogensen wrote: That's the point: Bugs that in dynamically typed languages would require testing to find are found by the compiler in a statically typed language. So whil eit may take onger to get a program thatgets past the compiler, it takes less time to get a program that works. In my experience the opposite is true for many programs. Having to actually know the precise type of every variable while writing the program is not necessary, it's a detail often not relevant to the core problem. The language should be able to take care of itself. In complex routines it can be useful for the programmer to give types and for the compiler to issue errors when they are contradicted. But for most routines it's just an unnecessary chore that the compiler forces on the programmer. Indeed. So use a language with type inference. Well, for most purposes that's the same as dynamic typing since the compiler doesn't require you to label the type of your variables. I occasionally use CMUCL and SBCL which do type inference, which is useful at improving generated code quality. It also can warn the programmer if they if they reuse a variable in a context implying that it's a different type which is useful. I see type inference as an optimization of dynamic typing rather than a generalization of static typing. But I suppose you can see it that way around. -- http://mail.python.org/mailman/listinfo/python-list
Re: Seeking regex optimizer
Mirco,
with special characters I mentioned control characters of regular
expressions i.e. one of .^$()?[]{}\|+* but not non ascii-127
characters.
For a workaround you simply have to mangle those using an escape
control character:
REGEXCHAR = .^$()?[]{}\\|+*
def mangle(s):
pattern = []
for c in s:
if c in REGEXCHAR:
pattern.append(\\)
pattern.append(c)
return .join(pattern)
Regards,
Kay
--
http://mail.python.org/mailman/listinfo/python-list
Re: Check if a file is closed
[EMAIL PROTECTED] wrote:
How to check if a file is closed?
f = open('trashme.txt', 'w')
f
open file 'trashme.txt', mode 'w' at 0x2ab66e40
dir(f)
['__class__', '__delattr__', '__doc__', '__getattribute__', '__hash__',
'__init__', '__iter__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__setattr__', '__str__', 'close', 'closed', 'encoding',
'fileno', 'flush', 'isatty', 'mode', 'name', 'newlines', 'next', 'read',
'readinto', 'readline', 'readlines', 'seek', 'softspace', 'tell',
'truncate', 'write', 'writelines', 'xreadlines']
f.closed
False
f.close()
f.closed
True
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Does anyone find what is fun in programming...?
You all suck. Am a programmer, and I must confess that I am dumb since am a programmer. Stop being silly and talk about programming as if youre writing a beautiful story. Youre not more than coding generators. Its the most boring work that anybody can imagine. Am a computer sciences graduate, and I am now a programmer, but I hope that soon I can escape from this shit. Am studying Business management right now, and I want to change the whole previous orientation of my career, you know why, because programming sucks the same as the programmers suck. Were a bunch of freaks, we dont have social life, actually I have a social life and that is why I cant go on with programming, and sure I wont let programming corrupt my head. You all, start the change and escape from programming. That is for your own benefit. And unfortunately now after clicking on the send button, I have to go back to my program and start this shit again. Go all to hell -- http://mail.python.org/mailman/listinfo/python-list
RE: Check if a file is closed
[EMAIL PROTECTED] | How to check if a file is closed? | | On Win32 you can call CreateFile with write and share write and if it | raises an error, the file is closed. | | How to do it in Python??? It's not clear whether you want a cross-platform Python-only solution. But if all you want is a way to use the Win32 CreateFile API in Python, then: http://aspn.activestate.com/ASPN/docs/ActivePython/2.4/pywin32/win32file __CreateFile_meth.html TJG This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk -- http://mail.python.org/mailman/listinfo/python-list
Just out of curiosity: Which languages are they using at Google and what for?
I know Google are using Python for testing purposes. But for the rest ? is it PHP or Java or .NET? Which technology is rendering the google main page? And of course th obvious question, why not Python? Alain -- http://mail.python.org/mailman/listinfo/python-list
Re: Noob script needs some input: CVS PatchMaker
John Machin wrote: Any feedback on what would be the pythonic way to do this would be much appreciated! --snip-- IMHO that flight of geese heading equatorwards for winter is not Xic for any language X. Compare with: He he, good point. 2nd comment: Make a habit of NOT using the names of built-ins like file for your own names. Pretend they are reserved words. Doesn't matter in this case, but will save you grief some day soon. Agree. 3rd comment: Read the section in the re manual that explains the difference between search and match. Searching for ^foo will give the same results as using match() with foo or the redundantly anchored ^foo. However some regex engines when presented with Good point. 4th comment: what you have called regx is a match object. mobj might be a better choice. The term regex is applied to a pattern, or sometimes to the compiled re object. ] HTH, John Thank you for taking the time :-) All points are noted. Holger, -- http://mail.python.org/mailman/listinfo/python-list
memory-leak in pysqlite 2.3.0 ?
After upgrading from pysqlite 2.0.5 to pysqlite 2.3.0 writing into a sqlite database increases memory consumption heavily. A similar program with Ruby and sqlite-ruby 1.1.0 does not affect memory consumption at all. Here a short example: --- #!/usr/bin/env python import os from pysqlite2 import dbapi2 print dbapi2.version db = dbapi2.connect(bla.db) c = db.cursor() c.execute(create table b (c integer)) for i in xrange(1000): c.execute(insert into b values (%d) % i) -- System in use: Python 2.4.1, Sqlite3 3.3.6, Pysqlite 2.3.0 Regards, Michael -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Rob Thorpe [EMAIL PROTECTED] writes: Torben Ægidius Mogensen wrote: Rob Thorpe [EMAIL PROTECTED] writes: Torben Ægidius Mogensen wrote: Indeed. So use a language with type inference. Well, for most purposes that's the same as dynamic typing since the compiler doesn't require you to label the type of your variables. That's not really the difference between static and dynamic typing. Static typing means that there exist a typing at compile-time that guarantess against run-time type violations. Dynamic typing means that such violations are detected at run-time. This is orthogonal to strong versus weak typing, which is about whether such violations are detected at all. The archetypal weakly typed language is machine code -- you can happily load a floating point value from memory, add it to a string pointer and jump to the resulting value. ML and Scheme are both strongly typed, but one is statically typed and the other dynamically typed. Anyway, type inference for statically typed langauges don't make them any more dynamically typed. It just moves the burden of assigning the types from the programmer to the compiler. And (for HM type systems) the compiler doesn't guess at a type -- it finds the unique most general type from which all other legal types (within the type system) can be found by instantiation. I occasionally use CMUCL and SBCL which do type inference, which is useful at improving generated code quality. It also can warn the programmer if they if they reuse a variable in a context implying that it's a different type which is useful. I see type inference as an optimization of dynamic typing rather than a generalization of static typing. But I suppose you can see it that way around. Some compilers for dynamically typed languages will do a type analysis similar to type inference, but they will happily compile a program even if they can't guarantee static type safety. Such type inference can be seen as an optimisation of dynamic typing, as it allows the compiler to omit _some_ of the runtime type checks. I prefer the term soft typing for this, though, so as not to confuse with static type inference. Soft typing can give feedback similar to that of type inference in terms of identifying potential problem spots, so in that respect it is similar to static type inference, and you might get similar fast code development. You miss some of the other benefits of static typing, though, such as a richer type system -- soft typing often lacks features like polymorphism (it will find a set of monomorphic instances rather than the most general type) and type classes. Torben -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
On 19 Jun 2006 10:19:05 +0200, [EMAIL PROTECTED] (Torben Ægidius Mogensen) wrote: If you don't have definitions (stubs or complete) of the functions you use in your code, you can only run it up to the point where you call an undefined function. So you can't really do much exploration until you have some definitions. Well in Lisp that just drops you into the debugger where you can supply the needed return data and continue. I agree that it is not something often needed. I expect a lot of the exploration you do with incomplete programs amount to the feedback you get from type inference. The ability to write functions and test them immediately without writing a lot of supporting code is _far_ more useful to me than type inference. I'm not going to weigh in on the static v dynamic argument ... I think both approaches have their place. I am, however, going to ask what information you think type inference can provide that substitutes for algorithm or data structure exploration. George -- for email reply remove / from address -- http://mail.python.org/mailman/listinfo/python-list
Re: Python with Eclipse
Stan Cook wrote: I've been trying to use Eclipse with Python on Linux for a while and have noticed something odd. After running the code or debugging a few times, its responsiveness gets really bad. Upon checking the equivalent of the task manager, I find several instances of Python running. When I kill these instances, the responsiveness comes back. I'm not sure if there is a better place to post this, but it is Python related. Is this just an issue with Eclipse or is there something else I should inspect? Any help would be appreciated. Regards, S Cook Which Python plugin are you using? PyDev? Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Yet Another Python Blog
Hello All, Decided that there are not enough blogs out there so http://pythonwise.blogspot.com/ is up :) This blog will feature a weekly (or about) Python code examples. I'll be glad to hear your comments. Miki, http://pythonwise.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Just out of curiosity: Which languages are they using at Google and what for?
[EMAIL PROTECTED] wrote:
I know Google are using Python for testing purposes.
Not only:
Where is Python used?
* The Google build system is written in python. All of Google's
corporate code is checked into a repository and the dependency and
building of this code is managed by python. Greg mentioned that to
create code.google.com took about 100 lines of python code. But since
it has so many dependencies, the build system generated a 3 megabyte
makefile for it!
* Packaging. Google has an internal packaging format like RPM.
These packages are created using python.
* Binary Data Pusher. This is the area where Alex Martelli is
working, on optimizing pushing bits between thousands of servers
* Production servers. All monitoring, restarting and data
collection functionality is done with python
* Reporting. Logs are analyzed and reports are generated using Python.
* A few services including code.google.com and google groups. Most
other front ends are in C++ (google.com) and Java (gmail). All web
services are built on top of a highly optimizing http server wrapped
with SWIG.
http://panela.blog-city.com/python_at_google_greg_stein__sdforum.htm
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: Simple script to make .png thumbnails from .zip archive...
Thanks a lot. I'm really new to python, and haven't coded in over a decade, so please be patient. :-) I'm able to read a .jpg from a .zip archive, but can't seem to manipulate it. If I do this: zip=zipfile.ZipFile(inURL,mode=r) picture=zip.read(00.jpg) I get the image, but it is of type ZipFile. How can I change it to type Image? Or am I thinking about this in the wrong way? I would like to follow this with something like: picture.thumbnail((128, 128), Image.ANTIALIAS) But obviously I can't do this directly. What am I missing? hdante wrote: Hi, I don't know zipfile by heart, but python official documentation is always good ( docs.python.org ). You need a loop in the file list like this: for file in zip: process(file) Unfortunatelly, there are too many ways to create a thumbnail from an image. I'll cite one, using the python image external module, that I've found to be very easy: import Image def process(file): try: image = Image.open(file) image.thumbnail ((128,128), Image.ANTIALIAS) image.save (file + '.thumb.png') except: print 'Skipping file', file Links: http://docs.python.org/lib/lib.html - Python Library Reference http://www.pythonware.com/library/pil/handbook/image.htm - The Image Module K P S wrote: Hi. I'm looking for a small script that will take a .zip archive and pull the first .jpg from the archive and convert it to a .png. The reason for this is I want to have tuhmbnails for these archives in nautilus under gnome. I would like something similar to the following code, which will pull a thumbnail from an openoffice.org (oasis) document. What I want is a little more involved, I guess, since I don't know the name of the file (for the zip.read command), and I need to convert the file from .jpg to .png once I get it. Any help would be appreciated. Including a pointer to a web page of a manual with examples. :-) #!/usr/bin/python import zipfile import sys import gnomevfs inURL=gnomevfs.get_local_path_from_uri(sys.argv[1]) outURL=sys.argv[2] zip=zipfile.ZipFile(inURL,mode=r) picture=zip.read(Thumbnails/thumbnail.png) thumbnail=open(outURL,w) thumbnail.write(picture) thumbnail.write(/n) zip.close() thumbnail.close() -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple script to make .png thumbnails from .zip archive...
Try adapting the other posters example with something like: import Image, StringIO zip=zipfile.ZipFile(inURL,mode=r) picture=zip.read(00.jpg) image = Image.open(StringIO(picture)) image.thumbnail ((128,128), Image.ANTIALIAS) image.save (file + '.thumb.png') I haven't tested it, but something like this should work. -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple script to make .png thumbnails from .zip archive...
K P S wrote: I'm able to read a .jpg from a .zip archive, but can't seem to manipulate it. If I do this: zip=zipfile.ZipFile(inURL,mode=r) picture=zip.read(00.jpg) I get the image, but it is of type ZipFile. string, more likely (zip is a ZipFile object, picture is a string of bytes). PIL expects a file name or a file object, so you need to use the StringIO adapter: picture = zip.read(name) # returns a string file = StringIO.StringIO(picture) # wrap string in file-like object image = Image.open(file) # create image object from file-like object /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple script to make .png thumbnails from .zip archive...
K P S wrote: What I want is a little more involved, I guess, since I don't know the name of the file (for the zip.read command) the first example on this page shows you how to get the names of all files in a zip file: http://effbot.org/librarybook/zipfile.htm /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Python with Eclipse
On 6/18/06, Stan Cook [EMAIL PROTECTED] wrote: I've been trying to use Eclipse with Python on Linux for awhile and have noticed something odd.After running thecode or debugging a few times, its responsiveness getsreally bad.Upon checking the equivalent of the task manager, I find several instances of Python running.When Ikill these instances, the responsiveness comes back.I'mnot sure if there is a better place to post this, but it isPython related.Is this just an issue with Eclipse or is there something else I should inspect? If you're using pydev, the problem might be that you have PyLint enabled. Having it enabled might have the effect of spawning several shells for doing code-analysis. You can try disabling it or using pydev extensions that gives you a faster code-analysis. You might also restrict the number of shells that PyDev can spawn at a given time in the pylint preferences (if that's not it, please report it as a bug in the pydev tracker at sourceforge, so that we can check other possibilities -- https://sourceforge.net/tracker/?group_id=85796atid=577329). Cheers, Fabio -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
George Neuner gneuner2/@comcast.net writes: On 19 Jun 2006 10:19:05 +0200, [EMAIL PROTECTED] (Torben Ægidius Mogensen) wrote: I expect a lot of the exploration you do with incomplete programs amount to the feedback you get from type inference. The ability to write functions and test them immediately without writing a lot of supporting code is _far_ more useful to me than type inference. I can't see what this has to do with static/dynamic typing. You can test individula functions in isolation is statically typed languages too. I'm not going to weigh in on the static v dynamic argument ... I think both approaches have their place. I am, however, going to ask what information you think type inference can provide that substitutes for algorithm or data structure exploration. None. But it can provide a framework for both and catch some types of mistakes early. Torben -- http://mail.python.org/mailman/listinfo/python-list
Amara installation
O/S WinXP Home Vsn of Python: 2.4 Wish to install Amara. Using amara-allinone-1.0.win32-py2.4.exe (2965KB) Forder structure before installation: c: python24 DLLs Doc Include Lib site-packages [previously installed stuff] libs scripts tcl tools When I run install, the install program indicates: Python directory: c:\python24\ Installation directory: c:\python24\lib\site-packages\ After install, folder structrue is: Vsn of Python: 2.4 Wish to install Amara. Using amara-allinone-1.0.win32-py2.4.exe (2965KB) Forder structure after installation: c: python24 DLLs Doc Include Lib site-packages [previously installed stuff] libs python24 -- lib -- site-packages-- new amara files/folders appear amara -- to be installed here ft -- scripts-- share -- scripts tcl tools I was expecting the new amara files/folders to be installed within the existing c:\python24\ folder structure...wasn't expecting it to create a new ...\python24\ folder within the parent ...\python24\ folder. My questions: 1) has anyone else observed this when installing? 2) should I move the newly installed files/folders into the previously-existing folder structure? as long as I don't remove files/folders, is there any risk of causing a previously installed site package that worked to no longer work? -- http://mail.python.org/mailman/listinfo/python-list
Re: Passing data to system command
Hi,
Holy mackerel, this really works; thanks a lot, guys. I played
around a little bit with the
suggestions by faulkner and hdante and pieced together the following
script. I like this
very much because I can write a bunch of data to the pipe, rather
than making one big
string containing perhaps several thousand lines of x-y pairs. I've
tested the script for
up to 100,000 data pairs and it works; passing a single string with
that many lines to
the psxy command generally leads to problems (?), I'm told...
For any other newbie's out there that are trying to use python and
GMT together:
The script uses GMT's psxy command (with the required arguments),
generates some
x-y data (just a sine function), and writes each x-y pair as a string
to the pipe. This should
work equally for any other GMT-commands.
I'm still trying to work out some of the details myself; I don't
understand, yet, what exactly
the command communicate does; but it seems to be needed.
chris
=
#! /usr/bin/python
from subprocess import Popen, PIPE
from math import *
from os import system
psfile = 'output1.ps'
cmd = 'psxy -R0/100/0/10 -JX10 -B10/1'
my_output = file(psfile, 'w')
p1 = Popen(cmd,stdin = PIPE,stdout=my_output,shell=True)
for i in range(1):
x = float(i)/100.0
y = 4.*sin(x/10.)+5.0
msg = str(x)+ +str(y)+\n
p1.stdin.write(msg)
p1.communicate()
my_output.close()
cmd = 'gv '+psfile
print cmd
p2 = Popen(cmd,shell=True)
p2.communicate()
=
On Jun 18, 2006, at 11:27 PM, hdante wrote:
Should be like this:
from subprocess import Popen, PIPE
my_output = file('output1.ps', 'w')
p1 = Popen([psxy], stdin = PIPE, stdout=my_output)
p1.stdin.write(my_format(array))
p1.communicate()
my_output.close()
I've never used that, though, please tell us if it worked.
Chris Hieronymus wrote:
Hi,
I have a bunch of x-y data contained in an array. I would like to
plot the data using an
external program (psxy in GMT). The plotting program takes x-y
couples as standard
input. How do I get the data into the system call? I used to do
things in csh and awk,
i.e., something like
awk '{some manipulations here; print $1, $2}' filename | psxy some
options ! output.ps
The reason I'm trying to use python is because the manipulations are
getting too cumbersome
in awk. Now I have all the manipulations done in python, but I'm
missing that last step.
I've tried various things with os.system, popen, and subprocess, but
so far without success.
Does anyone know how to do this?
chris
-
---
---
Christoph
Hieronymus
[EMAIL PROTECTED]
Associate
Professor
phone: (+46) 18-471 2383
Uppsala
University
fax: (+46) 18-501 110
Dept. of Earth Sciences (Geophysics)
Villavägen 16
SE-752 36 Uppsala, Sweden
--
http://mail.python.org/mailman/listinfo/python-list
---
Christoph
Hieronymus
[EMAIL PROTECTED]
Associate
Professor
phone: (+46) 18-471 2383
Uppsala
University
fax: (+46) 18-501 110
Dept. of Earth Sciences (Geophysics)
Villavägen 16
SE-752 36 Uppsala, Sweden
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python is fun (useless social thread) ;-)
Bruno wrote: 8(snip)-- | The answer is 42. That's all you need to know. Right on, Ford Prefect !!! What's for Lunch? - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: pyfcp
http://www.python.org/pyfcp It gets me to Error 404. -- http://mail.python.org/mailman/listinfo/python-list
Re: pyfcp
On Mon, 19 Jun 2006 14:45:19 +0800, Thomas Moore wrote: http://www.python.org/pyfcp It gets me to Error 404. Apologies - that URL should have been: http://www.python.org.nz/pyfcp -- Cheers aum -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting key presses
Not a stupid question at all - its something I was looking for, and was
(and still am) surprised not to find a cross platform implementation.
It must be possible - for a short while I dabbled with yabasic and
there the same source code would recognise a keypress in both Windows
and Linux.
My solution was:-
# Await key and return code - dos only
def _keycode_msvcrt(self):
#Loop till key pressed
while 1:
if msvcrt.kbhit():
k=ord(msvcrt.getch())
if k==0 or k==224:#Special keys
k=1000+ord(msvcrt.getch()) #return 1000+ 2nd code
pass
break
pass
pass
return k
# Await key and return code - linux only
def _keycode_linux2(self):
# Loop till key pressed
# Set up keycode list
a=[0,0,0,0,0,0]
# Press a key and populate list
try:
os.system('stty -icanon')
os.system('stty -echo')
a[0]=ord(sys.stdin.read(1))
if a[0]==27:
a[1]=ord(sys.stdin.read(1))
if a[1]==91:
a[2]=ord(sys.stdin.read(1))
if (a[2]=49 and a[2]=54) or a[2]==91:
a[3]=ord(sys.stdin.read(1))
if a[3]=48 and a[3]=57:
a[4]=ord(sys.stdin.read(1))
finally:
os.system('stty echo')
os.system('stty icanon')
# Decode keypress
if a==[ 10, 0, 0, 0, 0, 0]: k= 13 # Enter
elif a==[ 27, 27, 0, 0, 0, 0]: k= 27 # Esc (double
press)
elif a==[ 27, 91, 91, 65, 0, 0]: k=1059 # F1
elif a==[ 27, 91, 91, 66, 0, 0]: k=1060 # F2
elif a==[ 27, 91, 91, 67, 0, 0]: k=1061 # F3
elif a==[ 27, 91, 91, 68, 0, 0]: k=1062 # F4
elif a==[ 27, 91, 91, 69, 0, 0]: k=1063 # F5
elif a==[ 27, 91, 49, 55, 126, 0]: k=1064 # F6
elif a==[ 27, 91, 49, 56, 126, 0]: k=1065 # F7
elif a==[ 27, 91, 49, 57, 126, 0]: k=1066 # F8
elif a==[ 27, 91, 50, 48, 126, 0]: k=1067 # F9
elif a==[ 27, 91, 50, 49, 126, 0]: k=1068 # F10
elif a==[ 27, 91, 50, 51, 126, 0]: k=1133 # F11
elif a==[ 27, 91, 50, 52, 126, 0]: k=1134 # F12
elif a==[ 27, 91, 50, 126, 0, 0]: k=1082 # Ins
elif a==[ 27, 91, 51, 126, 0, 0]: k=1083 # Del
elif a==[ 27, 91, 49, 126, 0, 0]: k=1071 # Home
elif a==[ 27, 91, 52, 126, 0, 0]: k=1079 # End
elif a==[ 27, 91, 53, 126, 0, 0]: k=1073 # Pg Up
elif a==[ 27, 91, 54, 126, 0, 0]: k=1081 # Pg Dn
elif a==[ 27, 91, 65, 0, 0, 0]: k=1072 # Up
elif a==[ 27, 91, 66, 0, 0, 0]: k=1080 # Down
elif a==[ 27, 91, 68, 0, 0, 0]: k=1075 # Left
elif a==[ 27, 91, 67, 0, 0, 0]: k=1077 # Right
elif a==[127, 0, 0, 0, 0, 0]: k= 8 # Backspace
else: k=a[0] # Ascii code
# Done
return k
# Return key code
def key(self,case='NONE'):
# Get OS name and call platform specific function
a=sys.platform
if a=='linux2': #Linux (works on Fedora
Core 1 and 3)
k=self._keycode_linux2()
elif a=='win32': #windows
k=self._keycode_msvcrt()
else: #unknown
k=ord(raw_input())
# Adjust case
if case=='UPPER':
if k=97 and k=122:
k=k-32
if case=='LOWER':
if k=65 and k=90:
k=k+32
# Done
return k
A bit clumsy, I know (for example it needs a a double press to
recognise the escape key), and I'm not sure I understand why it works,
but for me it was a passable solution.
Peter
--
http://mail.python.org/mailman/listinfo/python-list
comparing two arrays
Hi, I have two arrays that are identical and contain 1s and zeros. Only the ones are valid and I need to know where both arrays have ones in the same position. I thought logical_and would work but this example proves otherwise: a = [0,1,2,5,6,6] b = [5,4,1,6,4,6] Numeric.logical_and(a==6,b==6) 0 Numeric.where(a==b,1,0) 0 Numeric.where(a==6 and b==6,1,0) 0 The where() statement is also worhtless here. Does anyone have any suggestion on how to do this? Thanks in advance, Sheldon -- http://mail.python.org/mailman/listinfo/python-list
Re: Seeking regex optimizer
On 19/06/2006 7:06 PM, Kay Schluehr wrote:
Mirco,
with special characters I mentioned control characters of regular
expressions i.e. one of .^$()?[]{}\|+* but not non ascii-127
characters.
For a workaround you simply have to mangle those using an escape
control character:
REGEXCHAR = .^$()?[]{}\\|+*
def mangle(s):
pattern = []
for c in s:
if c in REGEXCHAR:
pattern.append(\\)
pattern.append(c)
return .join(pattern)
What's wrong with re.escape()?
Have you not read (a) my response to Paddy's first posting (b) the manual?
--
http://mail.python.org/mailman/listinfo/python-list
Re: [OT] code is data
bruno at modulix wrote: I still don't get the point. Well, I've got to be careful here, lest I'd be associated with the terr.., eh, the childp..., eh the macro-enablers. The idea is to have a way to transform a Python (.py) module into XML and then do source code manipulations in XML-space using ElementTree. But rest assured, there is no such module, nor will we ever need it for anything. Anton use cases are for the faint-hearted -- http://mail.python.org/mailman/listinfo/python-list
Re: comparing two arrays
Sheldon wrote: Hi, I have two arrays that are identical and contain 1s and zeros. Only the Obviously they aren't identical. They may be of same size. ones are valid and I need to know where both arrays have ones in the same position. I thought logical_and would work but this example proves otherwise: a = [0,1,2,5,6,6] b = [5,4,1,6,4,6] Numeric.logical_and(a==6,b==6) 0 Numeric.where(a==b,1,0) 0 Numeric.where(a==6 and b==6,1,0) 0 The where() statement is also worhtless here. Does anyone have any suggestion on how to do this? print [i for i, _ in enumerate((None for v in zip(a, b) where v == (1,1)))] should give you the list of indices. Diez -- http://mail.python.org/mailman/listinfo/python-list
crawlers in python with graphing?
Hi I'm wondering if there is a toolkit in python anywhere for doing at a high level web crawling, dumping links to a data set that could be imported into R relatively easy or used in python natively to generate a graph over the website. It should hopefully be as high level as Wget, not download the pages but just follow the links, and output graphs. Cheers Bryan Rasmussen -- http://mail.python.org/mailman/listinfo/python-list
interactive multi-file search and replace
I need to do some searching and replacing in about 10 latex files. Does anyone have an existing script that does this on an interactive basis? I would like to show each match and ask whether or not it should be replaced. This seems like a fairly common task and I don't want to re-invent the wheel. Ryan -- http://mail.python.org/mailman/listinfo/python-list
Re: code is data
John Roth wrote: I saw the make statement as a breath of fresh air. Then it got shot down for what were, to me, totally trivial reasons. Which reasons? I as I recall, Guido cut it out without giving any reason. Of course Guido has the right to do so, but it is not respectful of all the work people like Steven Bethard and others did :-( Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] The baby and the bathwater (Re: Scoping, augmented assignment, 'fast locals' - conclusion)
Hello, just a couple points On 6/17/06, Josiah Carlson [EMAIL PROTECTED] wrote: [errors involving the shadowing of a variable by another] Of course everybody makes errors, but it doesn't follow from this, that all make the same errors, or should. If I implied that everyone has made this particular mistake, I'm sorry. I was trying to say that I made error X, and that I don't believe that I'm a unique butterfly to have made error X. Well, don't be so certain you aren't the exceptional butterfly as regards the general issue - if not the error itself, perhaps the onlook. It deemed on me over the week-end that all three of me, you, and Guido indeed, have been acting out our own names in some way. Guido van Rossum's case is most direct : The guide by red lights. Me, well, the issue of comparing slightly different versions is kind of written in the relationship of my first name and my family name. As for you, your name is exceptional in that it makes your initials shadow those of Jesus-Christ (a builtin if any); and if you go to the bottom of it, that collision of identifiers goes slightly further than just the initials. Is the idea that people may get subtly influenced by their own names, new to you ? One's name is to language and thought as one's home is to space... Bill Gates has always struck me as an injunction... ... One consequence of either a fixed or variable set of non-shadowables is that you would need to use arbitrarily unique names for lexically nested for loops, and/or specify that such variables are not referencing parent scopes. def foo(...): for i in ...: ... def bar(...): ... for i in ...: #unallowed ... ... You can replace the 'i' with a name of your choosing. Is such desireable? I would say no for the same reasons why I said no in regards to being able to explicitly name variables in different levels within lexically nested scopes: I would argue that one shouldn't be using closures in the first place, so encouraging its use with a syntax is right out the door. But that's my opinion, and not really relevant to the current discussion. I am surprised you would count the obligation of picking distinct names as an encouragement to use lexically nested scopes; compared to the current situation, it is in fact more -restrictive- and should thus count as -discouraging-. And imo picking different names for loop variables in such a case is rather a good thing. But, again, more good ain't more ease. Nit : retrospectively I believe I let you push me into equating closures with lexically nested function scopes, but am I right in believing closures in fact implies functions defined with nested scopes be exported/returned outside of the parent scope ? ... I don't believe that Guido is the end-all-be-all of language design, but I do find that I agree with him more often than not (though perhaps not vv), and at least in regards to this particular functionality, I side with the 'status quo' end of things. I dont understand the (though perhaps not vv). Is the vv intended to stand for you (eg, myself) ? I've always liked Guido's Python a lot, and part of it has to do with the ante-Bill-Gates magic of programming. For a looong while, my consistent experience with the Where do you want to go today ? MS slogan - as illustrated by MS products - has been that whenever you tried to find imaginative programming solutions (as opposed to obeying the designer's obvious expectation despite his claim he lets you free) you would collide with glass walls... or end up at a billing gate (=some commercial extension product). I've had slightly better experience in later years. Python always had a completely different feel, more like the restitution of the old magic to new generations. (btw, Prolog is the language that most gave me that feeling of allowing spectacular escapes from the designer's obvious expectations, so it is not a matter of constraints - prolog is quite constraining. I think it has to do with consistency and humbleness of a design that is not trying to out-think its users). As concerns the case in point, I think it was unfortunate that you would not let come into the open that the (risk of) inadvertent capture of builtins by un-nested function scopes was critical to the shape of the feature. Indeed, speaking of status quo ante : augmented assignments arrived with Python 2.0, while nested scopes where first introduced with 2.1. Have a good weekend, Thank you. I had a good weekend. I hope you too. And together with my thanks for your efforts, please recieve my apologies for temper... - Josiah [1] http://www.csmonitor.com/2006/0515/p13s01-stct.html ...as this seems to imply you would. Boris -- On naît tous les mètres du même monde -- http://mail.python.org/mailman/listinfo/python-list
Re: copyfile avoiding overwrites and race conditions
[EMAIL PROTECTED] wrote:
Here is a code fragment, where I am trying to copy a file, avoiding
overwrites and race conditions. The filename gets a '02','03','04' etc
appended to the end if a file with that name already exists.
I know the writing of the single space is overkill, but I am surprised
I cannot find an example of this floating around the web and newsgroups
my understanding of 'os.open' and 'os.fdopen' is minimal
## start fragment
i = 0
while True:
if i = 100: raise RanOutFileNamesError(fullpath)
i += 1
if i 1:
name0 = '%s_%02i%s' % (suggested_name, i, file_extension)
else:
assert i == 1
name0 = '%s%s' % (suggested_name, file_extension)
fullpath = os.path.join(path0, name0)
# create dummy file, force overwrite
try:
fd = os.open(
fullpath,
os.O_CREAT | os.O_EXCL | os.O_WRONLY)
except OSError:
continue
# is this really necessary?
file = os.fdopen(fd, w)
file.write(' ')
file.close()
shutil.copyfile(original_filepath, fullpath)
return fullpath
## end fragment
I guess my approach would be different. To eliminate any race
conditions, I would keep a small text file that always contained
the next filename that is to be written. Something like:
nextfiletowrite=/path/filename006.dat
I would try to get a lock on this file, read it, extract next
filename, increment the counter portion of the filename,
write it back out and unlock it. Now I have the name of the
file to write that is unique to my instance and I can write it
without worrying about other processes.
Hope this helps.
-Larry Bates
--
http://mail.python.org/mailman/listinfo/python-list
Tix Tree / HList widget?
Hi, I need to display some hierarchical data, and because I don't want to force users to install too many things beyond Python itself, I'm hoping to use Tix which is at least included with Python. I've managed to use the Tix HList widget to display a tree of items (at least in a proof-of-concept miniprogram) but I actually need to display 2 columns -- perhaps more. I figured out that I can specify the number of columns and the headers of the columns, but I haven't yet figured out how to set the values of the columns independantly. I tried using a tuple for the value of 'text' attribute, but that doesn't really seem to work. My second column never seems to be filled - all text goes into the first column. Also, the header for the second column never shows. I must be overlooking something rather basic in the manuals but for the moment I'm stumped. I'm also trying to figure out how to create a Tix 'Tree' widget instead of a HList, and make it do the same, but I don't know how to pass it the option for 2 columns: the 'Tree' widget refuses the option 'columns'. The samples in the Tix manual are for Tcl. I don't know how to translate their samples into Python/TkInter. How should I tell the Tix 'Tree' mega-widget that I need to pass an option to it's sub-widget? (At creation-time of that sub-widget, because that's the only time you can set the nr. of columns) Any clues? Anyone who can help? Are there any samples -- there's supposed to be a 'Demo' directory but I can't find it in my (windows) Python installation. Cheers, --Tim -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting key presses
Someone suggested using curses, but that does crazy things with my output, and leaves the terminal unusable after the program closes. It's very good suggestion but you should use also initscr and endwin functions. Regards, Rob -- http://mail.python.org/mailman/listinfo/python-list
Re: [OT] code is data
Anton Vredegoor wrote:
bruno at modulix wrote:
I still don't get the point.
Well, I've got to be careful here, lest I'd be associated with the
terr.., eh, the childp..., eh the macro-enablers.
The idea is to have a way to transform a Python (.py) module into XML
and then do source code manipulations in XML-space using ElementTree.
My my my... I'm not against the idea of dynamic source code
transformation, but for heaven's sake, *why* would one put XML in the
mix ???
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: comparing two arrays
You are comparing a normal python list to a constant, which are obviously unequal. Try converting your lists to arrays first (untested): import numeric/numpy as N a =N.array([0,1,2,5,6,6]) b = N.array([5,4,1,6,4,6]) print a==6 and b==6 print N.where(a==6 and b==6) hth, Bas Sheldon wrote: Hi, I have two arrays that are identical and contain 1s and zeros. Only the ones are valid and I need to know where both arrays have ones in the same position. I thought logical_and would work but this example proves otherwise: a = [0,1,2,5,6,6] b = [5,4,1,6,4,6] Numeric.logical_and(a==6,b==6) 0 Numeric.where(a==b,1,0) 0 Numeric.where(a==6 and b==6,1,0) 0 The where() statement is also worhtless here. Does anyone have any suggestion on how to do this? Thanks in advance, Sheldon -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython GUI designer
Take a look at pythoncard , we use it to produce database frontends , but apparently it also can be used for simple graphics apps and others. However if you are used to things like the Delphi IDE to build a gui app , then prepare to shed lots of tears before overcoming the initial disbelieve, that there is nothing better available for python. -- http://mail.python.org/mailman/listinfo/python-list
Re: comparing two arrays
Diez B. Roggisch wrote: print [i for i, _ in enumerate((None for v in zip(a, b) where v == (1,1)))] should give you the list of indices. I musunderstood your question. Use print [i for i, _ in enumerate((None for x, y in zip(a, b) where x == y))] instead. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython GUI designer
[EMAIL PROTECTED] wrote: I am newbie learning wxPython. I tried using GUI designer called wxGlade. When it generated code I couldnt get the same level of flexibility as writing the code by oneself. Any view on what you think about using GUI designer tools. Every help is appreciated. Try PythonCard. It's based on wxPython, and it's more higher level than Boa. Very simple and very easy to learn and use. -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
Roberto Bonvallet ha scritto: imho [EMAIL PROTECTED]: map(lambda x: , [i for i in [a,b,c] if i in (None,None) ]) You don't need map when using list comprehensions: [ for i in [a, b, c] if i in (None, None)] I know that... I tried to match the idiom used by the o.p. :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: [OT] code is data
bruno at modulix a écrit : Anton Vredegoor wrote: bruno at modulix wrote: I still don't get the point. Well, I've got to be careful here, lest I'd be associated with the terr.., eh, the childp..., eh the macro-enablers. The idea is to have a way to transform a Python (.py) module into XML and then do source code manipulations in XML-space using ElementTree. My my my... I'm not against the idea of dynamic source code transformation, but for heaven's sake, *why* would one put XML in the mix ??? Because its à la mode, and is better for a commercial point of view, even if inefficient for this problem. -- http://mail.python.org/mailman/listinfo/python-list
Re: Amara installation
[EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] O/S WinXP Home Vsn of Python: 2.4 Wish to install Amara. Using amara-allinone-1.0.win32-py2.4.exe (2965KB) Forder structure before installation: c: python24 DLLs Doc Include Lib site-packages [previously installed stuff] libs scripts tcl tools When I run install, the install program indicates: Python directory: c:\python24\ Installation directory: c:\python24\lib\site-packages\ After install, folder structrue is: Vsn of Python: 2.4 Wish to install Amara. Using amara-allinone-1.0.win32-py2.4.exe (2965KB) Forder structure after installation: c: python24 DLLs Doc Include Lib site-packages [previously installed stuff] libs python24 -- lib -- site-packages-- new amara files/folders appear amara -- to be installed here ft -- scripts-- share -- scripts tcl tools I was expecting the new amara files/folders to be installed within the existing c:\python24\ folder structure...wasn't expecting it to create a new ...\python24\ folder within the parent ...\python24\ folder. That is probably because you told it to, without knowing what exactly was being asked. It looks like this installer was intended for someone who does not already have Python installed. You might inquire as to whether there is one for people who do. My questions: 1) has anyone else observed this when installing? 2) should I move the newly installed files/folders into the previously-existing folder structure? as long as I don't remove files/folders, is there any risk of causing a previously installed site package that worked to no longer work? I don't think so. As long as the installer did not register file locations, this should work. If there are any shortcuts or start menu entries, you will have to edit. tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: Just out of curiosity: Which languages are they using at Google and what for?
bruno at modulix [EMAIL PROTECTED] wrote: ... * Packaging. Google has an internal packaging format like RPM. These packages are created using python. * Binary Data Pusher. This is the area where Alex Martelli is working, on optimizing pushing bits between thousands of servers * Production servers. All monitoring, restarting and data collection functionality is done with python Yep, Greg did say that at SDForum, but in fact I'm working on a much wider range of problems than just the datapush -- I lead Production Systems, which includes parts of all of the above and yet more stuff (account management, network verification, etc etc) -- done mostly in Python, but with substantial helpers in C++ as well (not so much for CPU efficiency reasons, as for keeping memory use under strict control when necessary, the area where C/C++ really shines;-). Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: Just out of curiosity: Which languages are they using at Google and what for?
[EMAIL PROTECTED] wrote: I know Google are using Python for testing purposes. ...and many more besides, as per the other response. But for the rest ? is it PHP or Java or .NET? Which technology is rendering the google main page? I think you can get a reasonable idea by perusing the 800+ job offers we currently have open;-), and eyeballing the several papers published by Googlers -- between one and the other, it becomes pretty clear that we use mostly Python, C++ and Java, plus of course a host of others for special purposes (Javascript for AJAX purposes, C and Assembly for kernel-hacking of various sort, SQL for relational databases, etc, etc), including some highly specialized ones invented within Google for highly specialized purposes (e.g., Rob Pike's sawzall for log-processing). And of course th obvious question, why not Python? You can read Pike et al's paper on sawzall to see why we would want a special-purpose language for that specialized, very-high-volume task, for example; I hope the reason for the other specialized ones, from Javascript to Assembly to SQL, is pretty obvious in each case;-). As among the three big ones -- Python, C++, Java -- there are good reasons why the overall job is best done by a mix of them. I won't address Java (we don't use any in my group, nor any of the groups we interact with intensely), but the tradeoffs between Python and C++ should, again, be pretty clear. For example, C++ allows (and demands) close control of where all your memory is going -- much harder to achieve in garbage collected languages such as Python or Java (managing memory IS a chore, but, under potentially heavy load, an important one). Also, a consideration I also made at SDForum: at Google's volumes of traffic, we need load-balancing among many machines, of course, but we _also_ are unwilling to let user experience suffer from high latencies. Now, you can scale the bandwidth of a cluster by throwing more servers at the problem -- but latency does not work the same way: you can't make a baby in 1 month by load-balancing among 9 mothers, as the saying goes. So, having as few machine-instructions as feasible on the critical paths that determine the user-perceived latency is important; even the very first paper by Page and Brin describing what would later become Google made the point indirectly -- they describe the crawling (where latency is no big deal) as being implemented in Python, but the processing of queries (where latency is crucial) in C++. Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Torben Ægidius Mogensen [EMAIL PROTECTED] wrote: That's not really the difference between static and dynamic typing. Static typing means that there exist a typing at compile-time that guarantess against run-time type violations. Dynamic typing means that such violations are detected at run-time. This is orthogonal to strong versus weak typing, which is about whether such violations are detected at all. The archetypal weakly typed language is machine code -- you can happily load a floating point value from memory, add it to a string pointer and jump to the resulting value. ML and Scheme are both strongly typed, but one is statically typed and the other dynamically typed. Knowing that it'll cause a lot of strenuous objection, I'll nevertheless interject my plea not to abuse the word type with a phrase like dynamically typed. If anyone considers untyped to be perjorative, as some people apparently do, then I'll note that another common term is type-free, which is marketing-approved but doesn't carry the misleading connotations of dynamically typed. We are quickly losing any rational meaning whatsoever to the word type, and that's quite a shame. By way of extending the point, let me mention that there is no such thing as a universal class of things that are called run-time type violations. At runtime, there is merely correct code and incorrect code. To the extent that anything is called a type at runtime, this is a different usage of the word from the usage by which we may define languages as being statically typed (which means just typed). In typed OO languages, this runtime usage is often called the class, for example, to distinguish it from type. This cleaner terminology eliminates a lot of confusion. For example, it clarifies that there is no binary division between strongly typed languages and weakly typed languages, since the division between a type error and any other kind of error is arbitrary, depending only on whether the type system in a particular language happens to catch that error. For example, type systems have been defined to try to catch unit errors in scientific programming, or to catch out-of-bounds array indices... yet these are not commonly called type errors only because such systems are not in common use. This also leads us to define something like language safety to encapsulate what we previously would have meant by the phrase strongly dynamically typed language. This also is a more general concept than we had before. Language safety refers to a language having well-defined behavior for as many operations as feasible, so that it's less likely that someone will do something spectacularly bad. Language safety may be achieved either by a type system or by runtime checks. Again, it's not absolute... I'm aware of no language that is completely determinate, at least if it supports any kind of concurrency. This isn't just a matter of preference in terminology. The definitions above (which are, in my experience, used widely by most non-academic language design discussions) actually limit our understanding of language design by pretending that certain delicate trade-offs such as the extent of the type system, or which language behavior is allowed to be non-deterministic or undefined, are etched in stone. This is simply not so. If types DON'T mean a compile-time method for proving the absence of certain program behaviors, then they don't mean anything at all. Pretending that there's a distinction at runtime between type errors and other errors serves only to confuse things and artificially limit which problems we are willing to concieve as being solvable by types. Anyway, type inference for statically typed langauges don't make them any more dynamically typed. Indeed it does not. Unless it weakens the ability of a compiler to prove the absence of certain program behaviors (which type inference does not), it doesn't move anything on the scale toward a type-free language. That being said, though, it is considered a feature of some programming languages that the programmer is asked to repeat type information in a few places. The compiler may not need the information, but for precisely the reason that the information is redundant, the compiler is then able to check the consistency of the programmer in applying the type. I won't get into precisely how useful this is, but it is nevertheless present as an advantage to outweigh the wordiness. -- Chris Smith - Lead Software Developer / Technical Trainer MindIQ Corporation -- http://mail.python.org/mailman/listinfo/python-list
Installing Python on Windows Vista
Hi all, Just a quick question... when I try to install Python on Windows Vista Beta 2 the installer seems to hang after I select the destination folder, saying that it will return when it has finished calculating disk space requirements. I just can't seem to get past that step. I've also tried installing both 2.4.3 and 2.4.2 with no luck. Any help would be very much appreciated. Many thanks P -- http://mail.python.org/mailman/listinfo/python-list
Formatted string to object
Hi,
can such a thing be done somehow?
aaa = self.aaa
bbb = %s.%s % ('parent', 'bbb')
Can you use strings or %s strings like in the above or
aaa = 'string'
aaa.%s() % 'upper'
Somehow?
Thanks for taking a look at this
Regards
Janama
--
http://mail.python.org/mailman/listinfo/python-list
Re: crawlers in python with graphing?
In [EMAIL PROTECTED], bryan rasmussen wrote: It should hopefully be as high level as Wget, not download the pages but just follow the links, and output graphs. How do you get at the links without downloading the page!? Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: memory-leak in pysqlite 2.3.0 ?
In [EMAIL PROTECTED], Michael Husmann wrote: After upgrading from pysqlite 2.0.5 to pysqlite 2.3.0 writing into a sqlite database increases memory consumption heavily. […] Here a short example: --- #!/usr/bin/env python import os from pysqlite2 import dbapi2 print dbapi2.version db = dbapi2.connect(bla.db) c = db.cursor() c.execute(create table b (c integer)) for i in xrange(1000): c.execute(insert into b values (%d) % i) Just a guess: Commit the changes from time to time. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Chris Smith wrote: Torben Ægidius Mogensen [EMAIL PROTECTED] wrote: That's not really the difference between static and dynamic typing. Static typing means that there exist a typing at compile-time that guarantess against run-time type violations. Dynamic typing means that such violations are detected at run-time. This is orthogonal to strong versus weak typing, which is about whether such violations are detected at all. The archetypal weakly typed language is machine code -- you can happily load a floating point value from memory, add it to a string pointer and jump to the resulting value. ML and Scheme are both strongly typed, but one is statically typed and the other dynamically typed. Knowing that it'll cause a lot of strenuous objection, I'll nevertheless interject my plea not to abuse the word type with a phrase like dynamically typed. If anyone considers untyped to be perjorative, as some people apparently do, then I'll note that another common term is type-free, which is marketing-approved but doesn't carry the misleading connotations of dynamically typed. We are quickly losing any rational meaning whatsoever to the word type, and that's quite a shame. I don't think dynamic typing is that nebulous. I remember this being discussed elsewhere some time ago, I'll post the same reply I did then .. A language is statically typed if a variable has a property - called it's type - attached to it, and given it's type it can only represent values defined by a certain class. A language is latently typed if a value has a property - called it's type - attached to it, and given it's type it can only represent values defined by a certain class. Some people use dynamic typing as a word for latent typing, others use it to mean something slightly different. But for most purposes the definition above works for dynamic typing also. Untyped and type-free mean something else: they mean no type checking is done. -- http://mail.python.org/mailman/listinfo/python-list
Re: [OT] code is data
Laurent Pointal wrote: The idea is to have a way to transform a Python (.py) module into XML and then do source code manipulations in XML-space using ElementTree. My my my... I'm not against the idea of dynamic source code transformation, but for heaven's sake, *why* would one put XML in the mix ??? because lots of people know how to describe XML transformations, and there are plenty of tools that implement such transformations efficiently ? Because its à la mode, and is better for a commercial point of view, even if inefficient for this problem. why would XML be inefficient ? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: pyfcp
In [EMAIL PROTECTED], aum wrote: On Mon, 19 Jun 2006 14:45:19 +0800, Thomas Moore wrote: http://www.python.org/pyfcp It gets me to Error 404. Apologies - that URL should have been: http://www.python.org.nz/pyfcp I get: Unknown host www.python.org.nz Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Python on Windows Vista
Padraig wrote: Hi all, Just a quick question... when I try to install Python on Windows Vista Beta 2 the installer seems to hang after I select the destination folder, saying that it will return when it has finished calculating disk space requirements. I just can't seem to get past that step. I've also tried installing both 2.4.3 and 2.4.2 with no luck. Any help would be very much appreciated. Many thanks P I've heard that Windows Vista has many restrictions on reading/writing to the disk, perhaps you do not have an admin account? -- http://mail.python.org/mailman/listinfo/python-list
Re: Which compiler will Python 2.5 / Windows (Intel) be built with?
Roel Schroeven wrote: [EMAIL PROTECTED] schreef: * The code created by the Windows GCC is not as good as the one created by the Microsoft compiler Isn't Python for other platforms built with GCC? Seems to me that if it GCC is good enough for other platforms, it's good enough for Windows. Actually, GCC on Linux does provide worse machine code than say, the Intel compiler for Linux. This is not a bug of GCC, but a feature, because GCC was created for maximum portability and flexibility, not for maximum performance on one single platform like the Intel compiler. But GCC is truly free and can be distributed easily (because it's GPL), so it is the default compiler for most (if not all) distros at the moment. Also, there are many free software programs that use special features of GCC and cannot be compiled using another compiler. Of course I do acknowledge that often in the real world the IO forms the bottleneck of a system and the efficiency of the machine code is somewhat neglegible (other posters pointed that out already). Markus -- http://mail.python.org/mailman/listinfo/python-list
Re: comparing two arrays
Bas wrote: You are comparing a normal python list to a constant, which are obviously unequal. Try converting your lists to arrays first (untested): import numeric/numpy as N a =N.array([0,1,2,5,6,6]) b = N.array([5,4,1,6,4,6]) print a==6 and b==6 print N.where(a==6 and b==6) Careful there. The and keyword cannot be overloaded and so neither Numeric nor numpy does. Either N.logical_and() should be used or (since the results of a==6 and b==6 are known to be boolean arrays) the operator works fine as well. In [9]: import numpy as np In [10]: a = np.array([0,1,2,5,6,6]) In [11]: b = np.array([5,4,1,6,4,6]) In [12]: (a==6) (b==6) Out[12]: array([False, False, False, False, False, True], dtype=bool) In [13]: np.where((a==6) (b==6)) Out[13]: (array([5]),) The OP may also find that numpy questions are best handled on numpy-discussion rather than comp.lang.python . https://lists.sourceforge.net/lists/listinfo/numpy-discussion -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Python on Windows Vista
[EMAIL PROTECTED] wrote: Padraig wrote: Hi all, Just a quick question... when I try to install Python on Windows Vista Beta 2 the installer seems to hang after I select the destination folder, saying that it will return when it has finished calculating disk space requirements. I just can't seem to get past that step. I've also tried installing both 2.4.3 and 2.4.2 with no luck. Any help would be very much appreciated. Many thanks P I've heard that Windows Vista has many restrictions on reading/writing to the disk, perhaps you do not have an admin account? I don't think there is such a thing as an admin account under vista but I'm sure that the account I'm using is the Vista-equivalent of an admin account. Perhaps running it in compatibility mode might help. Will try that this evening... Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: pyfcp
Marc 'BlackJack' Rintsch wrote: http://www.python.org.nz/pyfcp I get: Unknown host www.python.org.nz for future announcements, I'd recommend using: http://www.google.com/search?q=pyfcp /F -- http://mail.python.org/mailman/listinfo/python-list
Re: [pysqlite] memory-leak in pysqlite 2.3.0 ?
Michael Husmann wrote: Michael Husmann wrote: After upgrading from pysqlite 2.0.5 to pysqlite 2.3.0 writing into a sqlite database increases memory consumption heavily. A similar program with Ruby and sqlite-ruby 1.1.0 does not affect memory consumption at all. [...] Python 2.4.1, Sqlite3 3.3.6, Pysqlite 2.3.0 You never COMMIT your changes here, that's probably what's causing memory consumption on the SQLite side of things. [...] I also tried that commit(). Memory consumption still grows permanently. Thanks for the report. Upon debugging this a little, there's indeed a bug which crept in in pysqlite 2.2.1 because of incorrect usage of the weak references (*). This leads to the list of weak references per connection to always grow and never shrink. I'll try to provide a fix real soon. -- Gerhard (*) A missing PyWeakref_GetObject(), but I'll have to take a more careful look. -- http://mail.python.org/mailman/listinfo/python-list
Re: Formatted string to object
Can you use strings or %s strings like in the above or aaa = 'string' aaa.%s() % 'upper' Somehow? Looks like you want to play with the eval() function. aaa = 'hello' result = eval(aaa.%s() % 'upper') result 'HELLO' Works for your second example. May work on your first example too. -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Chris Smith wrote: Torben Ægidius Mogensen [EMAIL PROTECTED] wrote: That's not really the difference between static and dynamic typing. Static typing means that there exist a typing at compile-time that guarantess against run-time type violations. Dynamic typing means that such violations are detected at run-time. This is orthogonal to strong versus weak typing, which is about whether such violations are detected at all. The archetypal weakly typed language is machine code -- you can happily load a floating point value from memory, add it to a string pointer and jump to the resulting value. ML and Scheme are both strongly typed, but one is statically typed and the other dynamically typed. Knowing that it'll cause a lot of strenuous objection, I'll nevertheless interject my plea not to abuse the word type with a phrase like dynamically typed. If anyone considers untyped to be perjorative, as some people apparently do, then I'll note that another common term is type-free, which is marketing-approved but doesn't carry the misleading connotations of dynamically typed. We are quickly losing any rational meaning whatsoever to the word type, and that's quite a shame. The words untyped or type-free only make sense in a purely statically typed setting. In a dynamically typed setting, they are meaningless, in the sense that there are _of course_ types that the runtime system respects. Types can be represented at runtime via type tags. You could insist on using the term dynamically tagged languages, but this wouldn't change a lot. Exactly _because_ it doesn't make sense in a statically typed setting, the term dynamically typed language is good enough to communicate what we are talking about - i.e. not (static) typing. By way of extending the point, let me mention that there is no such thing as a universal class of things that are called run-time type violations. At runtime, there is merely correct code and incorrect code. No, there is more: There is safe and unsafe code (i.e., code that throws exceptions or that potentially just does random things). There are also runtime systems where you have the chance to fix the reason that caused the exception and continue to run your program. The latter play very well with dynamic types / type tags. To the extent that anything is called a type at runtime, this is a different usage of the word from the usage by which we may define languages as being statically typed (which means just typed). In typed OO languages, this runtime usage is often called the class, for example, to distinguish it from type. What type of person are you to tell other people what terminology to use? ;) Ha! Here I used type in just another sense of the word. ;) It is important to know the context in which you are discussing things. For example, we Common Lispers use the term type as defined in http://www.lispworks.com/documentation/HyperSpec/Body/26_glo_t.htm . You cannot possibly argue that our use of the word type is incorrect because in our context, when we talk about Common Lisp, the use of the word type better be consistent with that definition. (You can say that you don't like the definition, that it is unsound, or whatever, but that doesn't change anything here.) This cleaner terminology eliminates a lot of confusion. For example, it clarifies that there is no binary division between strongly typed languages and weakly typed languages, since the division between a type error and any other kind of error is arbitrary, depending only on whether the type system in a particular language happens to catch that error. For example, type systems have been defined to try to catch unit errors in scientific programming, or to catch out-of-bounds array indices... yet these are not commonly called type errors only because such systems are not in common use. What type system catches division by zero? That is, statically? Would you like to program in such a language? This isn't just a matter of preference in terminology. The definitions above (which are, in my experience, used widely by most non-academic language design discussions) actually limit our understanding of language design by pretending that certain delicate trade-offs such as the extent of the type system, or which language behavior is allowed to be non-deterministic or undefined, are etched in stone. This is simply not so. If types DON'T mean a compile-time method for proving the absence of certain program behaviors, then they don't mean anything at all. Pretending that there's a distinction at runtime between type errors and other errors serves only to confuse things and artificially limit which problems we are willing to concieve as being solvable by types. Your problem doesn't exist. Just say types when you're amongst your own folks, and static types when you're amongst a broader audience, and everything's fine. Instead
Re: code is data
Ravi Teja wrote: People have however written various language interpreters (Scheme, Forth and yes, even Basic) in Python, just for kicks. Still does not make it a DSL language anymore than it makes C a DSL language. At present, the closest thing to writing a DSL in Python is Logix http://livelogix.net/logix/ Too bad though, the project is defunct and there has never been enough interest in it. You might be interested in EasyExtend: http://www.fiber-space.de/EasyExtend/doc/EE.html Unlike Logix there are no macros defined in application code and there are no runtime macro expansions. So extension language semantics is always fixed at compile time. Personally, I would like to see macros in Python (actually Logix succeeding is good enough). But I am no language designer and the community has no interest in it. When I absolutely need macros, I will go elsewhere. Although Logix was written in Python and compiled to CPython bytecodes it was a language on its own right: a Python / Lisp hybrid. Opposed to this EasyExtend is a Python framework for language extensions and not itself a language. A quite typical use case may not involve any new grammar rules or terminals, but just generates code. See the coverage fiber as an example. -- http://mail.python.org/mailman/listinfo/python-list
Re: transfer rate limiting in socket.py
I looked at twisted briefly. It looks like it is server oriented. Does it work in for clients initiating connections? Jean-Paul Calderone wrote: On 16 Jun 2006 13:53:48 -0700, Peter Silva [EMAIL PROTECTED] wrote: Hi folks, I have a need in a network data distribution application to send out data to folks who want it using the protocol of their choice. I´d like it to support a variety of protocols and I don´t want to implement any of them :-) http, ftp (via ftplib) , https (dunno how yet), ssl, ssh, sftp (via paramiko) The thing is... I want rate-limiting so that in the case of a failure of a single client I don´t penalize the other clients, or if my server (which is acting as a client pushing to remote servers.) goes down, it doesn´t saturate the link when it comes back. So I want to have all the protocols limit the number of bytes they send per second. It looks like the easiest way to do this is to dive into socket.py... and look! it says: # Wrapper module for _socket, providing some additional facilities # implemented in Python. note the ´additional facilities implemented in python´ ... so we just add logic to: -- add a ´maxrate´ argument to the constructor and/or an attribute to modify the setting... -- tally bytes, and time, and know when we are going ´too fast´ -- when too fast.. in the ´flush´ routine, in the synchronous case, sleep for the correct time to come back under budget. in the async, return without writing. -- do something similar for reading. Anybody think this would be fun? Use Twisted instead. It supports every protocol you mentioned, and rate limiting too. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
multithreading windows and embedding python
I have posted about this problem before. SInce then I found a much
better article to help with embedding python in a multithreaded
application:
http://www.linuxjournal.com/article/3641
I found this article very good and it clarified for me what needs
doing. Now I have an example application that almost works, but it is
far from reliable. If I run this several times I get crashes telling me
that the heap is modified after deallocation. Can anybody else
reproduce this?
At the bottom of this file I left a debug dump, and a stack dump.
Here is my application, compile in windows using a standard windows
application project.
#include afxmt.h
#include afxwin.h
#include stdio.h
#include Python.h
#include Windows.h
#include process.h
static int threadnum = 0;
UINT MyThread(LPVOID lpParam)
{
ASSERT(Py_IsInitialized());
threadnum++;
PyThreadState* mainThreadState = (PyThreadState *)lpParam;
// get the global lock
PyEval_AcquireLock();
// get a reference to the PyInterpreterState
PyInterpreterState * mainInterpreterState = mainThreadState-interp;
PyThreadState_Swap(mainThreadState);
// create a thread state object for this thread
PyThreadState * myThreadState =
PyThreadState_New(mainInterpreterState);
// free the lock
PyEval_ReleaseLock();
// lock - swap in thread state - swap out thread state - unlock
PyEval_AcquireLock();
PyThreadState_Swap(myThreadState);
int num = 0;
int ret = 0;
ret = PyRun_SimpleString(x = []);
ret = PyRun_SimpleString(for i in range(10):\n x.append(i));
char cmd[100];
sprintf(cmd, f = open('c:/windows/temp/test%d.txt', 'w'),
threadnum);
ret = PyRun_SimpleString(cmd);
ret = PyRun_SimpleString(f.write('%s\\n' % x.__str__()));
sprintf(cmd, f.write('0x%d\\n'), myThreadState);
ret = PyRun_SimpleString(cmd);
ret = PyRun_SimpleString(f.close());
PyThreadState_Swap(NULL);
PyEval_ReleaseLock();
// clean up
// grab the lock
PyEval_AcquireLock();
// swap my thread state out of the interpreter
PyThreadState_Swap(NULL);
// clear out any cruft from thread state object
PyThreadState_Clear(myThreadState);
// delete my thread state object
PyThreadState_Delete(myThreadState);
// release the lock
PyEval_ReleaseLock();
return 0;
}
class CMyWinApp : public CWinApp
{
public:
CMyWinApp() { }
BOOL InitInstance()
{
Py_Initialize();
PyEval_InitThreads();
// save a pointer to the main PyThreadState object
PyThreadState * mainThreadState = PyThreadState_Get();
// release the lock
PyEval_ReleaseLock();
const int nhandles = 100;
HANDLE hnd[nhandles];
CWinThread* pThread[nhandles];
for (int ih = 0; ih nhandles; ih++)
{
pThread[ih] = AfxBeginThread(MyThread, mainThreadState,
THREAD_PRIORITY_NORMAL, CREATE_SUSPENDED);
pThread[ih]-m_bAutoDelete = false;
pThread[ih]-ResumeThread();
hnd[ih] = pThread[ih]-m_hThread;
}
int nwaits, nfails;
do
{
nwaits = 0;
nfails = 0;
for (int ih = 0; ih nhandles; ih++)
{
DWORD ret = WaitForSingleObject(hnd[ih],
INFINITE);
switch (ret)
{
case WAIT_OBJECT_0:
printf(WAIT_OBJECT_0\n);
break;
case WAIT_TIMEOUT:
++nwaits;
printf(WAIT_TIMEOUT\n);
break;
case WAIT_FAILED:
++nfails;
printf(WAIT_FAILED\n);
break;
}
}
}
while (nwaits 0);
ASSERT(nfails == 0);
// delete all windows threads
for (int ih = 0; ih nhandles; ++ih)
delete pThread[ih];
PyEval_AcquireLock();
PyThreadState_Swap(mainThreadState);
Py_Finalize();
return TRUE;
};
};
CMyWinApp app;
Debug dump:
'pyembed_test.exe': Loaded
Re: What is Expressiveness in a Computer Language
Rob Thorpe [EMAIL PROTECTED] wrote: A language is latently typed if a value has a property - called it's type - attached to it, and given it's type it can only represent values defined by a certain class. I'm assuming you mean class in the general sense, rather than in the sense of a specific construct of some subset of OO programming languages. Now I define a class of values called correct values. I define these to be those values for which my program will produce acceptable results. Clearly there is a defined class of such values: (1) they are immediately defined by the program's specification for those lines of code that produce output; (2) if they are defined for the values that result from any expression, then they are defined for the values that are used by that expression; and (3) for any value for which correctness is not defined by (1) or (2), we may define its correct values as the class of all possible values. Now, by your definition, any language which provides checking of that property of correctness for values is latently typed. Of course, there are no languages that assign this specific class of values; but ANY kind of correctness checking on values that a language does (if it's useful at all) is a subset of the perfect correctness checking system above. Apparently, we should call all such systems latent type systems. Can you point out a language that is not latently typed? I'm not trying to poke holes in your definition for fun. I am proposing that there is no fundamental distinction between the kinds of problems that are type problems and those that are not. Types are not a class of problems; they are a class of solutions. Languages that solve problems in ways that don't assign types to variables are not typed languages, even if those same problems may have been originally solved by type systems. Untyped and type-free mean something else: they mean no type checking is done. Hence, they don't exist, and the definitions being used here are rather pointless. -- Chris Smith - Lead Software Developer / Technical Trainer MindIQ Corporation -- http://mail.python.org/mailman/listinfo/python-list
Re: Formatted string to object
Tim Chase wrote:
Can you use strings or %s strings like in the above or
aaa = 'string'
aaa.%s() % 'upper'
Somehow?
Looks like you want to play with the eval() function.
aaa = 'hello'
result = eval(aaa.%s() % 'upper')
result
'HELLO'
Using eval() or exec should be really avoided whenever possible IMHO.
This one is best done with getattr(obj, attribute_name [,default]), ie:
aaa = string
getattr(aaa, 'upper')()
'STRING'
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: Getting output from external programs...
On Monday 19 June 2006 03:44, Cameron Laird wrote: In article [EMAIL PROTECTED], Ten [EMAIL PROTECTED] wrote: You can do this in various ways, ranging from the very simple and not very good from commands import getoutput x=getoutput(command) - to your more common and better popens. ie: import popen2 (stdOut, stdIn) = popen2.popen4(command) x=stdOut.readlines() - asynchronously if appropriate. How are you running the command at the moment? . . . Why deprecate commands.getoutput()? Are you merely observing that it's applicable in fewer circumstances? Absolutely so. Commands.getoutput is simple, quick and useful, just less versatile. Maybe not very good is a pretty vague, almost emotive-sounding way of putting it. My bad. :-) Cheers, Ten -- There are 10 types of people in this world, those who understand binary, and those who don't. -- http://mail.python.org/mailman/listinfo/python-list
Re: Which compiler will Python 2.5 / Windows (Intel) be built with?
[EMAIL PROTECTED] wrote: Also, there are many free software programs that use special features of GCC and cannot be compiled using another compiler. This is precisely what bothers me about standardizing on GCC -- lock-in is lock-in whether you must pay cash or not. --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Formatted string to object
janama wrote:
can such a thing be done somehow?
aaa = self.aaa
bbb = %s.%s % ('parent', 'bbb')
Can you use strings or %s strings like in the above or
aaa = 'string'
aaa.%s() % 'upper'
Use the getattr() function::
class parent(object):
... class bbb(object):
... pass
...
module_ns = __import__(__name__)
getattr(getattr(module_ns, 'parent'), 'bbb')
class '__main__.bbb'
import string
getattr(getattr(module_ns, 'string'), 'upper')
function upper at 0x00B502B0
I've imported the module itself here so you can use getattr, but you
could also use globals() instead of the inner getattr() call::
getattr(globals()['parent'], 'bbb')
class '__main__.bbb'
getattr(globals()['string'], 'upper')
function upper at 0x00B502B0
HTH,
STeVe
--
http://mail.python.org/mailman/listinfo/python-list
Re: Formatted string to object
janama wrote:
Hi,
can such a thing be done somehow?
aaa = self.aaa
bbb = %s.%s % ('parent', 'bbb')
Given the first line, I assume this is inside a method body, and parent
is a local var. Then the answer is:
bbb = getattr(locals()['parent'], 'bbb')
read the doc for these two functions to get more infos.
Can you use strings or %s strings like in the above or
aaa = 'string'
aaa.%s() % 'upper'
Somehow?
Not directly - but here again, getattr() is your friend.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
On 19 Jun 2006 13:53:01 +0200, [EMAIL PROTECTED] (Torben Ægidius Mogensen) wrote: George Neuner gneuner2/@comcast.net writes: On 19 Jun 2006 10:19:05 +0200, [EMAIL PROTECTED] (Torben Ægidius Mogensen) wrote: I expect a lot of the exploration you do with incomplete programs amount to the feedback you get from type inference. The ability to write functions and test them immediately without writing a lot of supporting code is _far_ more useful to me than type inference. I can't see what this has to do with static/dynamic typing. You can test individul functions in isolation is statically typed languages too. It has nothing to do with static/dynamic typing and that was the point ... that support for exploratory programming is orthogonal to the language's typing scheme. George -- for email reply remove / from address -- http://mail.python.org/mailman/listinfo/python-list
Pydev 1.2.0 Released
Hi All, Pydev and Pydev Extensions 1.2.0 have been released Details on Pydev Extensions: http://www.fabioz.com/pydev Details on Pydev: http://pydev.sf.net Details on its development: http://pydev.blogspot.com Release Highlights in Pydev Extensions: - - This is the first version supporting Eclipse 3.2. - Interactive console: content is now changed so that blocks are closed with the interactive interpreter 'rules' (so that you don't have invalid syntax errors when passing code-blocks to the interactive console). - An action was added to the menu so that you can use the Open Declaration Quick-outline without needing focus on the pydev editor. Release Highlights in Pydev: -- - Eclipse 3.2 supported (and 3.1 support is now discontinued) - Lot's of optimizations to make pydev faster - Ctrl+Click now works with the find definition engine - Comments that start with #--- are shown in the outline - Attributes are shown in the outline - Parse errors are now shown (again) in the editor - Many other bugs fixed What is PyDev? --- PyDev is a plugin that enables users to use Eclipse for Python and Jython development -- making Eclipse a first class Python IDE -- It comes with many goodies such as code completion, syntax highlighting, syntax analysis, refactor, debug and many others. Cheers, -- Fabio Zadrozny -- Software Developer ESSS - Engineering Simulation and Scientific Software http://www.esss.com.br Pydev Extensions http://www.fabioz.com/pydev Pydev - Python Development Enviroment for Eclipse http://pydev.sf.net http://pydev.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Pascal Costanza [EMAIL PROTECTED] wrote: Types can be represented at runtime via type tags. You could insist on using the term dynamically tagged languages, but this wouldn't change a lot. Exactly _because_ it doesn't make sense in a statically typed setting, the term dynamically typed language is good enough to communicate what we are talking about - i.e. not (static) typing. Okay, fair enough. It's certainly possible to use the same sequence of letters to mean two different things in different contexts. The problem arises, then, when Torben writes: : That's not really the difference between static and dynamic typing. : Static typing means that there exist a typing at compile-time that : guarantess against run-time type violations. Dynamic typing means : that such violations are detected at run-time. This is clearly not using the word type to mean two different things in different contexts. Rather, it is speaking under the mistaken impression that static typing and dynamic typing are varieties of some general thing called typing. In fact, the phrase dynamically typed was invented to do precisely that. My argument is not really with LISP programmers talking about types, by which they would mean approximately the same thing Java programmers mean by class. My point here concerns the confusion that results from the conception that there is this binary distinction (or continuum, or any other simple relationship) between a statically typed and a dynamically typed language. Torben's (and I don't mean to single out Torben -- the terminology is used quite widely) classification of dynamic versus static type systems depends on the misconception that there is some universal definition to the term type error or type violation and that the only question is how we address these well-defined things. It's that misconception that I aim to challenge. No, there is more: There is safe and unsafe code (i.e., code that throws exceptions or that potentially just does random things). There are also runtime systems where you have the chance to fix the reason that caused the exception and continue to run your program. The latter play very well with dynamic types / type tags. Yes, I was oversimplifying. What type system catches division by zero? That is, statically? I can define such a type system trivially. To do so, I simply define a type for integers, Z, and a subtype for non-zero integers, Z'. I then define the language such that division is only possible in an expression that looks like z / z' , where z has type Z and z' has type Z'. The language may then contain an expression: z 0? t1 : t2 in which t1 is evaluated in the parent type environment, but t2 is evaluated in the type environment augmented by (z - Z'), the type of the expression is the intersection type of t1 and t2 evaluated in those type environments, and the evaluation rules are defined as you probably expect. Would you like to program in such a language? No. Type systems for real programming languages are, of course, a balance between rigor and usability. This particular set of type rules doesn't seem to exhibit a good balance. Perhaps there is a way to achieve it in a way that is more workable, but it's not immediately obvious. As another example, from Pierce's text Types and Programming Languages, Pierce writes: Static elimination of array-bounds checking is a long-standing goal for type system designers. In principle, the necessary mechanisms (based on dependent types) are well understood, but packaging them in a form that balances expressive power, predictability and tractability of typechecking, and complexity of program annotations remains a significant challenge. Again, this could quite validly be described as a type error, just like division by zero or ANY other program error... it's just that the type system that solves it doesn't look appealing, so everyone punts the job to runtime checks (or, in some cases, to the CPU's memory protection features and/or the user's ability to fix resulting data corruption). Why aren't these things commonly considered type errors? There is only one reason: there exists no widely used language which solves them with types. (I mean in the programming language type theory sense of type; since many languages tag arrays with annotations indicating their dimensions, I guess you could say that we do solve them with types in the LISP sense). Your problem doesn't exist. Just say types when you're amongst your own folks, and static types when you're amongst a broader audience, and everything's fine. I think I've explained why that's not the case. I don't have a complaint about anyone speaking of types. It's the confusion from pretending that the two definitions are comparable that I'm pointing out. -- Chris Smith - Lead Software Developer / Technical Trainer MindIQ Corporation --
operator comparison for php vs python
Hi All, Ive already done a large amount of searching on Google to find out this information, but to no avale. Does anyone here know of a list of operators in python and there counterparts in php, or a website with this information? It would also be helpful to have this information along with perls syntax. Im going to be trying to port some php and perl stuff to python, and this information would be extremely useful, rather than going through all the documentation and reinventing the wheel. Thanks, -- Brandon McGinty Email:b[EMAIL PROTECTED] Skype:brandon.mcginty Msn:[EMAIL PROTECTED] Aim:brandonmcginty0 (Not currently available.) Cell:4802025790 (Weekends and nights only, please.) Languages:python, php, autoit; Currently Learning:perl Kindness is a language that the deaf can hear and the blind can see. Mark Twain -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Python on Windows Vista
[EMAIL PROTECTED] wrote: Padraig wrote: Hi all, Just a quick question... when I try to install Python on Windows Vista Beta 2 the installer seems to hang after I select the destination folder, saying that it will return when it has finished calculating disk space requirements. I just can't seem to get past that step. I've also tried installing both 2.4.3 and 2.4.2 with no luck. Any help would be very much appreciated. Many thanks P I've heard that Windows Vista has many restrictions on reading/writing to the disk, perhaps you do not have an admin account? I've managed to install it by using the msiexec command to manipulate windows installer directly. Running the installer in any mode that requires user input makes the installer hang when you choose the installation dir. I did an automated install with the following command: msiexec /i python-2.4.3.msi TARGETDIR=C:\Program Files\Python24 ALLUSERS=1 /qb The '/qb' only displays a progress bar and cancel button. This seems to bypass the installer problem. Wierd! I was going to try compatibility mode but it doesn't work for msi packages. -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
George Neuner gneuner2/@comcast.net writes: I am, however, going to ask what information you think type inference can provide that substitutes for algorithm or data structure exploration. Nobody wants to do such a substitution, of course. In /my/ experience, however, I find that doing algorithm and data structure exploration is greatly aided by a language with static types and type inference. YMMV. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python with Eclipse
Dennis Benzinger wrote: Stan Cook wrote: I've been trying to use Eclipse with Python on Linux for a while and have noticed something odd. After running the code or debugging a few times, its responsiveness gets really bad. Upon checking the equivalent of the task manager, I find several instances of Python running. When I kill these instances, the responsiveness comes back. I'm not sure if there is a better place to post this, but it is Python related. Is this just an issue with Eclipse or is there something else I should inspect? Any help would be appreciated. Regards, S Cook Which Python plugin are you using? PyDev? Bye, Dennis Hi, What other plugins are there ? Regards, Philippe -- http://mail.python.org/mailman/listinfo/python-list
Re: [OT] code is data
Fredrik Lundh wrote:
Laurent Pointal wrote:
Bruno Desthuilliers wrote:
Anton Vredegoor wrote:
The idea is to have a way to transform a Python (.py) module into XML
and then do source code manipulations in XML-space using ElementTree.
My my my... I'm not against the idea of dynamic source code
transformation, but for heaven's sake, *why* would one put XML in the
mix ???
because lots of people know how to describe XML transformations, and
there are plenty of tools that implement such transformations efficiently ?
Efficiently enough for dynamic (runtime) use ?
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Chris Smith [EMAIL PROTECTED] wrote in news:[EMAIL PROTECTED]: Rob Thorpe [EMAIL PROTECTED] wrote: A language is latently typed if a value has a property - called it's type - attached to it, and given it's type it can only represent values defined by a certain class. Now I define a class of values called correct values. I define these to be those values for which my program will produce acceptable results. Clearly there is a defined class of such values: (1) they are immediately defined by the program's specification for those lines of code that produce output; ... I'm not trying to poke holes in your definition for fun. I am proposing that there is no fundamental distinction between the kinds of problems that are type problems and those that are not. That sounds like a lot to demand of a type system. It almost sounds like it's supposed to test and debug the whole program. In general, defining the exact set of values for a given variable that generate acceptable output from your program will require detailed knowledge of the program and all its possible inputs. That goes beyond simple typing. It sounds more like contracts. Requiring an array index to be an integer is considered a typing problem because it can be checked based on only the variable itself, whereas checking whether it's in bounds requires knowledge about the array. -- YAD -- http://mail.python.org/mailman/listinfo/python-list
Re: Need Help comparing dates
I kept getting a Python error for the following line: month = m[webMonth] I changed it to month = month_numbers[webMonth] and that did the trick. Tim Chase wrote: I am new to Python and am working on my first program. I am trying to compare a date I found on a website to todays date. The problem I have is the website only shows 3 letter month name and the date. Example: Jun 15 No year, right? Are you making the assumption that the year is the current year? How would I go about comparing that to a different date? Once you've got them as dates, from datetime import date you can just compare them as you would any other comparable items. If you need to map the month-strings back into actual dates, you can use this dictionary: month_numbers = dict([(date(2006, m, 1).strftime(%b), m) for m in range(1,13)]) It happens to be locale specific, so you might have to tinker a bit if you're mapping comes out differently from what the website uses. I also made the assumption the case was the same (rather than trying to normalize to upper/lower case) Then, you can use webpageDateString = Mar 21 webMonth, webDay = webpageDateString.split() month = m[webMonth] day = int(webDay) webpageDate = date(date.today().year, month, day) compareDate = date.today() compareDate webpageDate False compareDate webpageDate True You can wrap the load in a function, something like def isNewer(dateString, year = date.today().year): ... monthString, dayString = dateString.split() ... month = month_numbers[monthString] ... day = int(dayString) ... return date.today() date(year, month, day) which will allow you to do isNewer(Jul 1) True isNewer(Apr 1) False and the like. There's plenty of good stuff in the datetime module. -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: What is Expressiveness in a Computer Language
Rob Thorpe [EMAIL PROTECTED] writes: I don't think dynamic typing is that nebulous. I remember this being discussed elsewhere some time ago, I'll post the same reply I did then .. A language is statically typed if a variable has a property - called it's type - attached to it, and given it's type it can only represent values defined by a certain class. By this definition, all languages are statically typed (by making that certain class the set of all values). Moreover, this definition, when read the way you probably wanted it to be read, requires some considerable stretch to accommodate existing static type systems such as F_\omega. Perhaps better: A language is statically typed if its definition includes (or ever better: is based on) a static type system, i.e., a static semantics with typing judgments derivable by typing rules. Usually typing judgmets associate program phrases (expressions) with types given a typing environment. A language is latently typed if a value has a property - called it's type - attached to it, and given it's type it can only represent values defined by a certain class. This definition makes little sense. Any given value can obviously only represent one value: itself. Dynamic types are nothing more than sets of values, often given by computable predicates. Untyped and type-free mean something else: they mean no type checking is done. Look up untyped lambda calculus. -- http://mail.python.org/mailman/listinfo/python-list
