[issue39120] pyodbc dll load failed
New submission from Neil Faulkner : Please can someone advise as to the root cause of this error? -- components: Library (Lib) files: DLL.PNG messages: 358796 nosy: nf00038 priority: normal severity: normal status: open title: pyodbc dll load failed type: compile error versions: Python 3.8 Added file: https://bugs.python.org/file48800/DLL.PNG ___ Python tracker <https://bugs.python.org/issue39120> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Best method for a menu in a command line program?
Sorry, I wasn't aware it was doing that but... I've removed it :-) Sorry about that, Braden Faulkner -- http://mail.python.org/mailman/listinfo/python-list
Best method for a menu in a command line program?
I'm using a menu for my command line app using this method. choice = foobar while choice != q: if choice == c: temp = input(Celsius temperature:) print Fahrenheit:,celsius_to_fahrenheit(temp) elif choice == f: temp = input(Fahrenheit temperature:) print Celsius:,fahrenheit_to_celsius(temp) elif choice != q: print_options() choice = raw_input(option:) Just wondering if there is another or more efficient way I should be doing it? Thanks -- Braden Faulkner -- http://mail.python.org/mailman/listinfo/python-list
RE: text file reformatting
I also am having issues with this.
Date: Sun, 31 Oct 2010 14:48:09 -0500
From: python.l...@tim.thechases.com
To: iwawi...@gmail.com
Subject: Re: text file reformatting
CC: python-list@python.org
PRJ01001 4 00100END
PRJ01002 3 00110END
I would like to pick only some columns to a new file and put them to a
certain places (to match previous data) - definition file (def.csv)
could be something like this:
VARIABLEFIELDSTARTS FIELD SIZE NEW PLACE IN NEW DATA FILE
ProjID ; 1 ; 5 ; 1
CaseID ; 6 ; 3 ; 10
UselessV ; 10 ; 1 ;
Zipcode ; 12 ; 5 ; 15
So the new datafile should look like this:
PRJ01001 00100END
PRJ01002 00110END
How flexible is the def.csv format? The difficulty I see with
your def.csv format is that it leaves undefined gaps (presumably
to be filled in with spaces) and that you also have a blank new
place in new file value. If instead, you could specify the
width to which you want to pad it and omit variables you don't
want in the output, ordering the variables in the same order you
want them in the output:
Variable; Start; Size; Width
ProjID; 1; 5; 10
CaseID; 6; 3; 10
Zipcode; 12; 5; 5
End; 16; 3; 3
(note that I lazily use the same method to copy the END from the
source to the destination, rather than coding specially for it)
you could do something like this (untested)
import csv
f = file('def.csv', 'rb')
f.next() # discard the header row
r = csv.reader(f, delimiter=';')
fields = [
(varname, slice(int(start), int(start)+int(size)), width)
for varname, start, size, width
in r
]
f.close()
out = file('out.txt', 'w')
try:
for row in file('data.txt'):
for varname, slc, width in fields:
out.write(row[slc].ljust(width))
out.write('\n')
finally:
out.close()
Hope that's fairly easy to follow and makes sense. There might
be some fence-posting errors (particularly your use of 1 as the
initial offset, while python uses 0 as the initial offset for
strings)
If you can't modify the def.csv format, then things are a bit
more complex and I'd almost be tempted to write a script to try
and convert your existing def.csv format into something simpler
to process like what I describe.
-tkc
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RE: text file reformatting
Sorry to clarify, I was having issues getting this to work. I'm relatively new
to Python. Sorry for the miscommunication.
Date: Sun, 31 Oct 2010 16:13:42 -0500
From: python.l...@tim.thechases.com
To: brad...@hotmail.com
CC: python-list@python.org
Subject: Re: text file reformatting
On 10/31/10 14:52, Braden Faulkner wrote:
import csv
f = file('def.csv', 'rb')
f.next() # discard the header row
r = csv.reader(f, delimiter=';')
fields = [
(varname, slice(int(start), int(start)+int(size)), width)
for varname, start, size, width
in r
]
f.close()
out = file('out.txt', 'w')
try:
for row in file('data.txt'):
for varname, slc, width in fields:
out.write(row[slc].ljust(width))
out.write('\n')
finally:
out.close()
I also am having issues with this.
[top-posting fixed -- it's generally frowned upon in this
newsgroup/mailing-list and adherence to the preferences will tend
to get you a wider audience]
Are your issues with my code, or with the topic at hand? If it's
my code, note my comment about it being untested. If it's the
topic at hand, I recommend trying my code (or a variation
there-of after you've tested it).
-tkc
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[Beginer Question] I heard about python needing some sort of _VariableName_ boiler plate?
Can anyone explain to me how this works, I don't seem to have to do it in IDLE? Thanks! -- http://mail.python.org/mailman/listinfo/python-list
RE: Python 2.7 or 3.1
I personally would take only one bite at a time. Meaning only do one then do the other later. But to each it own :) Date: Fri, 29 Oct 2010 17:48:11 -0500 To: python-list@python.org From: jbiq...@icsmx.com Subject: Re: Python 2.7 or 3.1 Hello all Would you consider a not so intelligent move for a newsbie to Python to have maybe version 2.7 and 3.x (if that's possible to be running together on the same machine) to have them run and be learning mainly in 2.7 and see differences in 3.x? In my case I am interested mainly in web applications with a database and if possible being accesing dbase since a projects still runs a big system under dbase format, or definitely stay with 2.7 for a while until most in migrate it t o 3.x? Thanks in advance Jorge Biquez At 05:21 p.m. 29/10/2010, geremy condra wrote: On Wed, Oct 27, 2010 at 7:18 PM, Braden Faulkner brad...@hotmail.com wrote: Would it be safe to say that 2.6 would be even better for beginners than? Let me just come out with a contrary point of view before you go down that path. If you're seriously considering using sqlite, then you may be just as well off using Python3 as 2.7 or 2.6- it's in all of the above, and Python3 is a big cleanup over previous versions of the language. Geremy Condra -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Create a GUI and EXE for a python app?
Having trouble with my mail client, so sorry if this goes through more than once. I'm worknig on a simple math program as my first application. I would like to make a cross-platform pretty GUI for it and also package it up in a EXE for distribution on Windows. What are the best and easiest ways I can do this?Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.7 or 3.1
Would it be safe to say that 2.6 would be even better for beginners than? -- http://mail.python.org/mailman/listinfo/python-list
Python 2.7 or 3.1
Which is better for a beginner to get started in Python with? Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: pydoc enforcement.
Hi Yeah, I was thinking about something at commit time for a VCS... catch is, soo many VCS's out there. And I wasn't thinking of the default action throwing compile errors, but would only do that if a particular flag was given. Still, just an idea. I'm just finding more and more public modules/API's/libraries that have so little documentation that it really does force reading a LOT of the source to figure out whats going on. Sure, a lot of the time thats required, but some modules are just painful.. oh well... was just a thought. Ken On Tue, Dec 2, 2008 at 3:03 AM, J. Cliff Dyer [EMAIL PROTECTED] wrote: On Sun, 2008-11-30 at 16:27 -0800, [EMAIL PROTECTED] wrote: I've been thinking about implementing (although no idea yet *HOW*) the following features/extension for the python compile stage and would be interested in any thoughts/comments/flames etc. Basically I'm interested adding a check to see if: 1) pydoc's are written for every function/method. 2) There are entries for each parameter, defined by some predetermined syntax. My idea is that as much as I love dynamic typing, there are times when using some modules/API's that have less than stellar documentation. I was thinking that if it was possible to enable some switch that basically forced compilation to fail if certain documentation criteria weren't met. Yes, it should be up to developers to provide documentation in the first place. Or, the client developer might need to read the source (IF its available)... but having some forced documentation might at least ease the problem a little. For example (half borrowing from Javadoc). class Foo( object ): def bar( self, ui ): pass Would fail, since the bar method has an unknown parameter called ui. What I think could be interesting is that the compiler forces some documentation such as: class Foo( object ): def bar( self, ui ): @Param: ui : blah blah blah. pass The compiler could check for @Param matching each parameter passed to the method/function. Sure, a lot of people might just not put a description in, so we'd be no better off. But at least its getting them *that* far, maybe it would encourage them to actually fill in details. Now ofcourse, in statically typed language, they might have the description as Instance of UIClass or something like that. For Python, maybe just a description of Instance of abstract class UI or List of Dictionaries... or whatever. Sure, precise class names mightn't be mentioned (since we mightn't know what is being used then), but having *some* description would certainly be helpful (I feel). Even if no-one else is interested in this feature, I think it could help my own development (and would be an interested first change into Python itself). Apart from bagging the idea, does anyone have a suggestion on where in the Python source I would start for implementing such an idea? Thanks Ken For the reasons already stated, I think it's probably a bad idea to enforce this at compile time. I think it's a great idea to make sure that this information is present in all your code, but unless you want to see useless stubs, the correct time to enforce this is at commit time. Don't accept any improperly documented patches. Syntax is not enough to ensure what you want to ensure. The semantics have to be right as well. Cheers, Cliff -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I programmatically find the name of a method from within that method?
On Aug 8, 12:45 am, kj7ny [EMAIL PROTECTED] wrote: Is there a way that I can programmatically find the name of a method I have created from within that method? I would like to be able to log a message from within that method (def) and I would like to include the name of the method from which it was written without having to hard-code that value in every message string. While we're at it, is there a way to programmatically get the name of the class and the module while I'm at it? Thanks, def foo(): print sys._getframe(0).f_code.co_name most of the darkest magic of python is in the frames returned by sys._getframe. -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I programmatically find the name of a method from within that method?
On Aug 8, 10:43 pm, faulkner [EMAIL PROTECTED] wrote: On Aug 8, 12:45 am, kj7ny [EMAIL PROTECTED] wrote: Is there a way that I can programmatically find the name of a method I have created from within that method? I would like to be able to log a message from within that method (def) and I would like to include the name of the method from which it was written without having to hard-code that value in every message string. While we're at it, is there a way to programmatically get the name of the class and the module while I'm at it? Thanks, def foo(): print sys._getframe(0).f_code.co_name most of the darkest magic of python is in the frames returned by sys._getframe. sorry for the double-post. i forgot to answer the rest of the question. class a: def b(self, *a): print sys._getframe(0).f_code.co_name print self.__class__.__name__ print getattr(self, sys._getframe(0).f_code.co_name).im_class.__name__ print self.__class__.__module__ def log(f): def newf(*a, **kw): if a and f.func_code.co_varnames[0] == 'self': print '%s.%s.%s %r %r' % (a[0].__class__.__module__, a[0].__class__.__name__, f.func_name, a, kw) else: print '%s.%s %r %r' % (f.func_globals['__name__'], f.func_name, a, kw) f(*a, **kw) newf.__name__ = f.__name__ newf.__doc__ = f.__doc__ return newf you can find more interesting attributes of frame and function objects using the builtin dir function. -- http://mail.python.org/mailman/listinfo/python-list
Re: Heterogeneous lists
On Aug 7, 2:53 pm, Gordon Airporte [EMAIL PROTECTED] wrote: This is one of those nice, permissive Python features but I was wondering how often people actually use lists holding several different types of objects. It looks like whenever I need to group different objects I create a class, if only so I can use more meaningful names than '[2]' for the items. How often do these show up in your code? Is this simply the upshot of the underlying arrays holding only object references of some sort? how else would you implement an n-ary tree? eg, AST, CST, minimax, GP. -- http://mail.python.org/mailman/listinfo/python-list
Re: custom plugin architecture: how to see parent namespace?
On Jul 22, 10:06 am, escalation746 [EMAIL PROTECTED] wrote:
I've got a namespace query that amounts to this: How can an imported
function see data in the parent custom namespace? I have read through
numerous posts which skirt this issue without answering it.
To illustrate, create plugin.py with a couple of functions. The second
will obviously fail.
def Hello():
print 'hello'
def ViewValuable():
print VALUABLE
Then create master.py which loads the plugin at runtime, later running
various code fragments against it.
# location of plugin module
filespec = '/path/to/plugins/plugin.py'
filepath, filename = os.path.split(filespec)
filename = os.path.splitext(filename)[0]
# add to system path
if filepath not in sys.path:
sys.path.append(filepath)
# import into our namespace
space = __import__(filename, globals(), locals(), [])
namespace = space.__dict__
# sometime later in the code... define a new function
def _plus():
print 'plus'
# add that to our namespace
namespace.update({'Plus': _plus, 'VALUABLE': 'gold'})
# run custom code
code =
Hello()
Plus()
Valuable()
exec code in namespace
This code will echo the lines:
hello
plus
Followed by a traceback for:
NameError: global name 'VALUABLE' is not defined
The question is: How do I get a function in plugin.py to see VALUABLE?
Using external storage of some sort is not viable since many different
instances of plugin.py, all with different values of VALUABLE, might
be running at once. (In fact VALUABLE is to be a key into a whole
whack of data stored in a separate module space.)
Extensive modifications to plugin.py is also not a viable approach,
since that module will be created by users. Rather, I need to be able
to pass something at execution time to make this happen. Or create an
access function along the lines of _plus() that I can inject into the
namespace.
Any help, please? I've been losing sleep over this one.
-- robin
sys._getframe(1).f_locals
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Re: bash-style pipes in python?
On Jul 11, 8:56 pm, Dan Stromberg - Datallegro
[EMAIL PROTECTED] wrote:
I'm constantly flipping back and forth between bash and python.
Sometimes, I'll start a program in one, and end up recoding in the
other, or including a bunch of python inside my bash scripts, or snippets
of bash in my python.
But what if python had more of the power of bash-style pipes? I might not
need to flip back and forth so much. I could code almost entirely in python.
The kind of thing I do over and over in bash looks like:
#!/usr/bin/env bash
# exit on errors, like python. Exit on undefind variables, like
python.
set -eu
# give the true/false value of the last false command in a pipeline
# not the true/false value of the lat command in the pipeline - like
# nothing I've seen
set -o pipefail
# save output in output, but only echo it to the screen if the
command fails
if ! output=$(foo | bar 21)
then
echo $0: foo | bar failed 12
echo $output 12
exit 1
fi
Sometimes I use $PIPESTATUS too, but not that much.
I'm aware that python has a variety of pipe handling support in its
standard library.
But is there a similarly-simple way already, in python, of hooking the stdout
of
process foo to the stdin of process bar, saving the stdout and errors from
both
in a variable, and still having convenient access to process exit values?
Would it be possible to overload | (pipe) in python to have the same behavior
as in
bash?
I could deal with slightly more cumbersome syntax, like:
(stdout, stderrs, exit_status) = proc('foo') | proc('bar')
...if the basic semantics were there.
How about it? Has someone already done this?
class P(subprocess.Popen):
def __or__(self, otherp):
otherp.stdin.write(self.stdout.read())
otherp.stdin.close()
return otherp
def __init__(self, cmd, *a, **kw):
for s in ['out', 'in', 'err']: kw.setdefault('std' + s, -1)
subprocess.Popen.__init__(self, cmd.split(), *a, **kw)
print (P('cat /etc/fstab') | P('grep x')).stdout.read()
of course, you don't need to overload __init__ at all, and you can
return otherp.stdout.read() instead of otherp, and you can make
__gt__, __lt__ read and write files. unfortunately, you can't really
fudge , , |, or any of the more useful pipes, but you can make
more extensive use of __or__:
class Pipe:
def __or__(self, other):
if isinstance(other, Pipe): return ...
elif isinstance(other, P): return ...
def __init__(self, pipe_type): ...
k = Pipe(foo)
m = Pipe(bar)
P() |k| P()
P() |m| P()
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Re: Get a filename list of a web site
On Jul 10, 5:12 am, [EMAIL PROTECTED] wrote: Hi all, is it possible to get a filename directory list of a website (possibly with full path indication)? Using python possibly wget? Bye. HTTP does not provide a command for this. you need to acquire a shell account on the specific server you're interested in. generally, this requires emailing the addresses in the whois database, explaining why you need a shell account. generally, they will deny your request. then you can say `ssh [EMAIL PROTECTED] ls DIRECTORY`. a few directories on a few servers are configured such that they list themselves when queried. iirc, there's a google trick to let you find these directories. -- http://mail.python.org/mailman/listinfo/python-list
Re: Too many 'self' in python.That's a big flaw in this language.
On Jun 27, 7:02 am, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: HI I'm currently using Python. I find that a instance variable must confined with self, for example: class a: def __init__(self): self.aa=10 def bb(self): print self.aa # See .if in c++,I could use aa to change that variable That's a big inconvenience in coding ,especially when you have lot of variable If you method need 10 variables ,you have to type self for 10 times and that also makes your variable longer. From My point,I think this only help python interpreter to deside where to look for. Is there anyone know's how to make the interpreter find instance name space first? Or any way to make programmer's life easier? http://www.voidspace.org.uk/python/weblog/arch_d7_2006_12_16.shtml#e584 -- http://mail.python.org/mailman/listinfo/python-list
Re: labeled break/continue
On Jun 18, 12:35 am, Matt Chisholm [EMAIL PROTECTED] wrote: Hi. I was wondering if there had ever been an official decision on the idea of adding labeled break and continue functionality to Python. I've found a few places where the idea has come up, in the context of named code blocks: http://groups.google.com/group/comp.lang.python/browse_thread/thread/... and in the context of discussing do/while loops and assignments in conditionals: http://groups.google.com/group/comp.lang.python/browse_thread/thread/... Both of those discussions just kind of petered out or changed direction without any conclusion. There's also this Python 2.6 which has a similar syntax (although different semantics) to one of the syntaxes proposed in the first discussion above: http://sourceforge.net/tracker/index.php?func=detailaid=1714448grou... I would be willing to help make a case and then write a PEP for labeled break and continue, as long as the community or the BDFL hasn't already decided against it. -matt P.S. My apologies about cross posting; python-ideas seems like a better place to post this, but PEP 1 says to post to python-list. python-dev just mentioned that the BDFL vetoed it a while ago. they're writing a PEP just to document why it was vetoed. -- http://mail.python.org/mailman/listinfo/python-list
Re: getting scancodes
On Apr 23, 8:39 pm, [EMAIL PROTECTED] wrote: Anyone knows if its possible to get scan codes ??? I tried with getch () but with no success, just keycodes. May be using the something in the sys.stdin module ?? is this what you're looking for? http://cheeseshop.python.org/pypi/sysio/1.0 and sys.stdin isn't a module. it's a file. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Feature Request: Allow changing base of member indices to 1
On Apr 14, 6:27 am, [EMAIL PROTECTED] wrote:
This is like the previous one. Please check for sanity and approve for
posting at python-dev.
I would like to have something like option base in Visual Basic.
IIRC it used to allow me to choose whether 0 or 1 should be used as
the base of member indices of arrays. In Python, the same can be used
with strings, lists, tuples etc.
This would mean:
foo = foo
= foo[1] == 'f'
foo = ['foo', 'bar', 'spam' ]
= foo[1] == 'foo'
foo = ('spam', 'eggs')
= foo[1] == 'spam'
For convenience it should also affect the range function so that:
range(3) = [1, 2, 3]
because this is often used where arrays would be used in VB.
Finally, when the programmer does not specify his choice of base at
the beginning of the program, the current behaviour of using 0 as base
should continue so that there is no problem with backward
compatibility.
__future__ is used to access upcoming features, and changing the base
offset is not [and never will be] slated for future development. zero
has been used as the base offset in all real languages since the dawn
of time, and isn't something that can be changed without seriously
breaking heads.
i can't believe nobody's posted this yet:
http://www.xkcd.com/c163.html
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Re: Python Feature Request: (?) Group all file-directory-related stdlib functions in one place
On Apr 14, 6:30 am, [EMAIL PROTECTED] wrote: Please check for sanity and approve for posting at python-dev. Currently file-directory-related functionality in the Python standard library is scattered among various modules such as shutil, os, dircache etc. So I request that the functions be gathered and consolidated at one place. Some may need renaming to avoid conflicts or for clarification. checkout the py3k svn branch and submit a patch [extending or conforming to pep355] to python-dev. -- http://mail.python.org/mailman/listinfo/python-list
Re: tkinter how to write
On Mar 8, 7:07 pm, Gigs_ [EMAIL PROTECTED] wrote: as I write my first gui program (text editor) I wanna ask you guys how to separate code in classes.? Should I put in one class my menu and in another class text and scorllbars etc? or something else? thanks Use the force. Do whatever feels most right. Remember that you can always refactor. A good rule of thumb for GUIs is MVC [a class or set of classes to encapsulate the abstract relationships known as the Model, another class or set of classes to handle translating changes to the model into changes in the GUI aka View, and another class or set of classes to encapsulate the Controlling of everything], but do not pursue this to its extreme inanity as Java does. Follow guidelines only so long as they clarify the code. The second you can no longer keep the overall structure of the code in your head at once, hit control+z until you can. When I wrote my text editor, I wanted to keep everything in one class because I thought it would be cleaner. Several thousand lines later, I realized that the notion of a Tab is a significant and powerful abstraction, as is the UndoStack and the entries in it [UndoEntry]. Right now, I'm thinking about separating all the menuitem callbacks into their own class because they are different in kind from the methods which encapsulate the Tabs, menubar, statusbar, etc. into an application. The reason that I probably won't do this is that a class is not for grouping methods, it's for representing objects. UML is another expounded tool for achieving OOP zen before you set fingertips to keyboard. i've never grokked it, but you should try it at least once, if only so you can say that you have in a job interview. -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin set literal
On Feb 14, 11:55 am, Schüle Daniel [EMAIL PROTECTED] wrote: Hello, lst = list((1,2,3)) lst = [1,2,3] t = tupel((1,2,3)) t = (1,2,3) s = set((1,2,3)) s = ... it would be nice feature to have builtin literal for set type maybe in P3 .. what about? s = 1,2,3 Regards, Daniel sets aren't quite that useful or common. just use a list. and '' and '' already have syntactic meanings. and that would make python look more like C++, which nobody wants. -- http://mail.python.org/mailman/listinfo/python-list
Re: Something like the getattr() trick.
On Feb 10, 3:34 pm, Ayaz Ahmed Khan [EMAIL PROTECTED] wrote:
I'm working with the following class heirarchy (I've snipped out the code
from the classes):
class Vuln:
def __init__(self, url):
pass
def _parse(self):
pass
def get_link(self):
pass
class VulnInfo(Vuln):
pass
class VulnDiscuss(Vuln):
pass
def main(url):
vuln_class = ['Info', 'Discuss']
vuln = Vuln(url)
vuln._parse()
for link in vuln.get_link():
i = VulnInfo(link)
i._parse()
d = VulnDiscuss(link)
d._parse()
Is there a way to get references to VulnInfo and VulnDiscuss objects using
something like the getattr trick? For example, something like:
for _class in vuln_class:
class_obj = getattr('Vuln%s' % (_class,) ..)
a = class_obj(link)
a._parse()
getattr() takes an object as its first argument. I can't seem to figure
out how to make it work here.
--
Ayaz Ahmed Khan
A witty saying proves nothing, but saying something pointless gets
people's attention.
eval('Vuln' + _class)
or,
Vuln.Discuss = VulnDiscuss
getattr(Vuln, _class)
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Lython
I have Lython! I want to make sure that anybody else who wants it can access it, so, unless Mr. Egan objects, I'm hosting it here: http://home.comcast.net/~faulkner612/programming/python/lython.zip I had to patch it a bit because the number of arguments to compiler.ast.Function.__init__ changed between 2.3 and 2.4, when decorators were introduced. I haven't tested it on 2.5 because the last time I upgraded python, my gentoo died. I also took the liberty of adding some features such as primitive interactivity, a '-c code' option, a '-h' option, an rc file '~/.lythonrc.ly', and a '-o file' option which dumps bytecode to file. I've slated developing support for *args, **kwargs, default arguments, += and -= etc., reader macros ala common lisp, classes, try...except...finally, and raise. For the curious, here are some other implementations of lisp in python: http://ibiblio.org/obp/py4fun/lisp/lisp.html http://hkn.eecs.berkeley.edu/~dyoo/python/pyscheme/ http://www.xs4all.nl/~yduppen/site/psyche.html http://www.biostat.wisc.edu/~annis/creations/PyLisp/ These implementations are great, but Lython has macro capabilities, generates python byte code, and demonstrates the use of spark, a fantastic parsing package. -- http://mail.python.org/mailman/listinfo/python-list
Re: question on pygtk and accessibility on windows.
if by 'accessibility' you mean 'usable' (like python and firefox are usable), then yes. there are pygtk bindings for windows, and they work. http://python-forum.org/py/viewtopic.php?t=116 if by 'accessibility' you mean 'usable for the blind/deaf', then i think that is up to you as an application developer. krishnakant Mane wrote: has any one tried py gtk on windows? I tried to do a google search for accessibility related issues but did not find any thing specific to pygtk and windows accessibility. I even tried to search for just gtk and windows accessibility but again no result. so I am now posting this message as a last hope to at least get a yes or no answer on whether py gtk is accessible with windows. thanks. Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
Re: why would anyone use python when java is there?
functional programming, list comprehensions, decorators, duck typing, generators, dynamism, introspection, prettier code, simpler grammar [see digg and /. for the graphs], and, of course, the trolls. gavino wrote: wtf -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple question to split
def splits(seq, cs):
if not cs: return seq
elif isinstance(seq, str): return splits(seq.split(cs[0]), cs[1:])
else: return splits(sum([elem.split(cs[0]) for elem in seq], []),
cs[1:])
or
a = re.split('(\ |\,)', a)
a.remove(' ')
a.remove(',')
Matthias Winterland wrote:
Hi,
I have a simple question. When I read in a string like:
a='1,2,3,4,5 6 7,3,4', can I get the list l=[1,2,3,4,5,6,7,3,4] with a
single split-call?
Thx,
Matthias
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Re: Computer locks up when running valid stand alone Tkinter file.
But, when I call it from another module it locks
methinks this other module has the answer.
jim-on-linux wrote:
py help,
The file below will run as a stand alone file.
It works fine as it is.
But, when I call it from another module it locks
my computer, The off switch is the only
salvation.
This module when run as a stand alone, it will
open a jpeg image and add a vertical and
horizontal scrollbar to the canvass.
That's all it does.
Replace the img9.jpg file with one of your own,
put the image in the current working dir., and
run.
If you think you can help, I would appreciate it.
jim-on-linux
#!/usr/bin/env python
#
import Tkinter as Tk
Do not do
( from Tkinter import * )
because of name space conflict with
Image.open
##
below imports Image and ImageTk are from
Imaging-1.1.5, PIL in Python
import Image
import ImageTk
import Tkinter as Tk
import os
vpath = os.getcwd()+os.sep+'img9.jpg'
class Kshow_0 :
def __init__(self ) :
self.Fimgshow0()
def Fimgshow0(self ) :
window = Tk.Tk()# used for stamd alone
# window = Tk.Toplevel()
# Above Toplevel call used when running
# from another file
window.title(' Image Location '+vpath )
window.protocol('WM_DELETE_WINDOW',
window.destroy)
vcanvas = Tk.Canvas(window, width = 375,
height=375,
borderwidth = 1, bg=
'white')
sbarY=Tk.Scrollbar()
sbarX = Tk.Scrollbar( orient='horizontal')
sbarY.config(command= vcanvas.yview)
sbarX.config(command= vcanvas.xview)
vcanvas.config(yscrollcommand=sbarY.set)
vcanvas.config(xscrollcommand=sbarX.set)
sbarY.pack(side='right', fill='y')
sbarX.pack(side='bottom', fill='x')
vcanvas.pack(expand='yes', fill='both')
im= Image.open( vpath)
tkim = ImageTk.PhotoImage(im)
imgW = tkim.width()
print imgW, '## imgW, jpg 58\n'
imgH = tkim.height()
print imgH, '## imgH, jpg 61\n'
# Draw the image on the canvas
vcanvas.create_image(0, 0, image=tkim,
anchor = 'nw' )
vcanvas.config(scrollregion= (0, 0, imgW,
imgH))
window.mainloop ()
if __name__ == '__main__' :
Kshow_0()
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Re: Painless way to do 3D visualization
http://www.vpython.org/ Peter Beattie wrote: Hey folks, I need to do the following relatively simple 3D programming: I want to convert data from four-item tuples into 3D co-ordinates in a regular tetrahedron. Co-ordinates come in sequences of 10 to 20, and the individual dots in the tetrahedron need to be connected into discontinuous lines. A single tetrahedron should contain at least two, possibly more, such lines. I would like to show certain similarities in the sequences/lines, eg by changing color, thickness, or maybe attaching indeces to certain points in a particular sequence. I'd welcome suggestions as to what might be the most painless way to achieve this in Python. So far, I've only tinkered a little with VPython, but the lack of any decent documentation has proved to be a major turn-off. TIA! -- Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I make a class that can be converted into an int?
__int__ __long__ __float__ Matthew Wilson wrote: What are the internal methods that I need to define on any class so that this code can work? c = C(three) i = int(c) # i is 3 I can handle the part of mapping three to 3, but I don't know what internal method is called when int(c) happens. For string conversion, I just define the __str__ method. What's the equivalent for int? For float, too, while I'm at it? TIA Matt -- A better way of running series of SAS programs: http://overlook.homelinux.net/wilsonwiki/SasAndMakefiles -- http://mail.python.org/mailman/listinfo/python-list
Re: python gtk based file manager
http://www.google.com/search?q=emelfm2 awesome file manager written in C using gtk. i've been meaning to write something like emelfm in pygtk, but emelfm already exists... Fabian Braennstroem wrote: Hi, I am looking for a file manager based on pygtk. It seems that there does not exist any!? Maybe, someone has a hint or already some starting code lines for such a 'thing'!? Greetings! Fabian -- http://mail.python.org/mailman/listinfo/python-list
Re: does anybody earn a living programming in python?
both my last summer jobs consisted entirely of python, and the jobs i'm looking at for next summer all involve python. and one of my profs makes a living teaching python. and the office i worked for 2 summers ago was 5 old guys who did nothing but python and stock trade analysis all day. if i'm lucky, my career employer after i get out of grad school will let me play with python and lisp all day everyday. [so, google, please don't start sucking any time soon.] walterbyrd wrote: If so, I doubt there are many. I wonder why that is? -- http://mail.python.org/mailman/listinfo/python-list
Re: does anybody earn a living programming in python?
where do you find these contract jobs, if you don't mind my asking? Christian wrote: walterbyrd wrote: If so, I doubt there are many. I wonder why that is? Previously I used Python while earning a living working in IT at a college. Currently it is putting food on the table via contract jobs. I imagine there are many out there like me, doing just that. Christian http://www.dowski.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Best practice for large source code projects
several of my programs are thousands of lines long, and i don't think they're extravagantly large. i'd say you should use modules the same way you use classes and functions: to separate code logically. if it makes sense to think of a group of statements as a function, you make it a function. if it makes sense to think of a group of functions as data as a single object, you make a class. if it makes sense to think of a collection of classes and functions and data as a collective unit, make a module. and so on for packages. if it makes sense for a single function to be hundreds or thousands of lines long, so be it. follow the modern poet's rule: ignore restrictions that don't make sense, and follow closely the restrictions you choose. [EMAIL PROTECTED] wrote: I'm developing a web system and based on some patterns I've seen elsewhere, I made a single file (model.py) to hold all of the functions and classes that define the model porition of the application. Hence the code in the controller looks like: import model def Display(req,id): # It works and things make sense to me. Yet, I feel uneasy that my model.py file is starting to approach 500 lines. What's the best practice or community opinion on this? Do I keep everything in a single file or do I start dividing things into separate files? TIA -- http://mail.python.org/mailman/listinfo/python-list
Re: How to find number of characters in a unicode string?
are you sure you're using unicode objects? len(u'\u') == 1 the encodings module should help you turn '\xff\xff' into u'\u'. Preben Randhol wrote: Hi If I use len() on a string containing unicode letters I get the number of bytes the string uses. This means that len() can report size 6 when the unicode string only contains 3 characters (that one would write by hand or see on the screen). Is there a way to calculate in characters and not in bytes to represent the characters. The reason for asking is that PyGTK needs number of characters to set the width of Entry widgets to a certain length, and it expects viewable characters and not number of bytes to represent them. Thanks in advance Preben -- http://mail.python.org/mailman/listinfo/python-list
Re: Webbrowser written totally in Python
this was just on digg: ## import wx from urllib import urlopen import wx.html class Frame(wx.Frame): def userPageButton(self, event): goToPage=self.userPage.GetValue() goToPage='http://www.' + goToPage webpage=urlopen(goToPage).read() displayPage=self.html.SetPage(webpage) def __init__(self): wx.Frame.__init__(self, parent=None, id=-1, title='microBrowser', size=(800, 600), pos=(50, 50)) panel=wx.Panel(self) self.userPage=wx.TextCtrl(panel, pos=(400, 5)) # self.html = wx.html.HtmlWindow(panel, id=-1, size=(780, 530), pos=(10, 35), style=wx.html.HW_SCROLLBAR_AUTO) userPageButton=wx.Button(panel, label='Go!', pos=(300, 5)) userPageButton.Bind(wx.EVT_BUTTON, self.userPageButton) class App(wx.App): def OnInit(self): self.frame=Frame() self.frame.Show() self.SetTopWindow(self.frame) return True if __name__=='__main__': app=App() app.MainLoop() # there are also python bindings for gtkmozembed in gnome-python-extras and here: http://sourceforge.net/projects/pygtkmoz Franz Steinhaeusler wrote: Hello NG, is there any (GUI) webbrowser written completly in Python? in pyGtk, pyQt, wxPython or TkInter? -- Franz Steinhaeusler -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform application restart?
asynchronously start a process which waits for the parent to close, then starts your script. cmd = python -c 'import time,os;time.sleep(2);os.system(YOUR_SCRIPT)' if os.name == 'nt': cmd = 'start ' + cmd else: cmd += ' ' subprocess.Popen(cmd, shell=True) sys.exit() Heikki Toivonen wrote: Is there any way to restart a Python (GUI) application that would work on Windows, Mac OS X and Linux? I'd like to provide a restart button to a dialog that would restart the application to pick new changes or start with different options. -- Heikki Toivonen -- http://mail.python.org/mailman/listinfo/python-list
Re: looking for data on csv files
import re if re.search(nome, row[rowcsv], re.I): ... that's re.I [capital i] as in ignorecase. flit wrote: Hi! I am using the csv modules.. when I use the command: if nome in row[rowcsv]: print \n print row[rowcsv] + \n + row[11] + \n print there is this case: 1- data on file PUItarr If the user try to find for puitarr or PUITARR it doesn´t find. I tried the string.upper and .lower , but there is a a way to look far all possible combinations? And yes, i am a newbie.. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python daemon process
process = subprocess.Popen(gnuchess) ... os.kill(process.pid, signal.SIGKILL) Thomas Dybdahl Ahle wrote: Hi, I'm writing a program, using popen4(gnuchess), The problem is, that gnuchess keeps running after program exit. I know about the atexit module, but in java, you could make a process a daemon process, and it would only run as long as the real processes ran. I think this is a better way to stop gnuchess, as you are 100% sure, that it'll stop. Can you do this with popen? -- Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie programmer question: How do parsers work?(Python examples?)
http://pages.cpsc.ucalgary.ca/~aycock/spark/ http://www-128.ibm.com/developerworks/library/l-spark.html bio_enthusiast wrote: I was wondering exactly how you create a parser. I'm learning Python and I recently have come across this material. I'm interested in the method or art of writing a parser. If anyone has some python code to post for an abstract parser, or links to some informative tutorials, that would be great. -- http://mail.python.org/mailman/listinfo/python-list
Re: callable to disappear?
what's wrong with hasattr(obj, '__call__')? Antoon Pardon wrote: I have been reading http://www.python.org/dev/peps/pep-3100/ en there is written: To be removed: ... callable(): just call the object and catch the exception ... But that doesn't seem to be a generally available option. The place where you want to check if something is callable doens't need to be the place where you actually want to call it. Removing callable will mean that you can't check whether or not something is callable without incurring the side-effects of calling it. I also think code will become more ugly How do you suggest I would code the following: if callable(func): for i, el in lst: lst[i] = func(el) othercode() I can code as follows: try: for i, el in lst: lst[i] = func(el) othercode() except TypeError: pass But this has the problem that othercode could throw a TypeError: So it seems I would need at least two try statements try: for i, el in lst: try: lst[i] = func(el) except TypeError raise LoopBreak othercode() except LoopBreak: pass And this still has problems because the TypeError could be raised because lst is an unsubscriptable object. Is there a chance this will be reconsidered? -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: swapping numeric items in a list
for i in xrange(0, len(your_list), 2): your_list[i], your_list[i + 1] = your_list[i + 1], your_list[i] Jiang Nutao wrote: Hi, I simplify my problem like below To convert list aa = [0x12, 0x34, 0x56, 0x78] into [0x34, 0x12, 0x78, 0x56] How to do it fast? My real list is huge. Thanks a lot. Jason -- http://mail.python.org/mailman/listinfo/python-list
Re: [NEWB]: List with random numbers
what you want is impossible. step back a second. you want 7 distinct ints all between 0 and 5 inclusive. of course you'll loop forever. once you get all 6 numbers, no matter what you get will already be in your list. if you want floats between 0 and 6, say '6 * random.random()'. random.randrange is equivalent to random.choice(range(*arguments)), which only deals with whole numbers. eltower wrote: Hey all, I'm trying to write a program in Python for learning purposes which is meant to: Generate a random number from 0 to 6 Insert this random number to the end of a list unless the number is already there finish with a len(list) = 7 so far, I have this: import random random_list = [] while len(random_list) 8: j = random.randrange(6) if (j in random_list): continue else: random_list.append(j) continue print random_list however, I get stuck in an infinite loop. Any suggestions? Thank you in advance, Adri -- http://mail.python.org/mailman/listinfo/python-list
Re: TypeError: 'module' object is not callable (newby question)
works for me. do you do anything in your script besides that?
Charles Russell wrote:
Why does this work from the python prompt, but fail from a script?
How does one make it work from a script?
#! /usr/bin/python
import glob
# following line works from python prompt; why not in script?
files=glob.glob('*.py')
print files
Traceback (most recent call last):
File ./glob.py, line 2, in ?
import glob
File /home/cdr/python/glob.py, line 5, in ?
files=glob.glob('*.py')
TypeError: 'module' object is not callable
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Re: seeking the Hello World of Packages
yep, that's all a package is. if you have trouble importing, check your PYTHONPATH environment variable, or sys.path. Bell, Kevin wrote: I'm trying to get an idea of how packages work and I've read about it in the Py Tutorial and Nutshell, but I'm still craving a concrete example that I can poke through. Does anyone have a really basic package that does very little that I could look at? What I've gathered thus far is that a package is simply a directory, say C:\MyPackage, that would contain __init__.py which tells Python to be aware of all the other modules in C:\MyPackage. Am I correct? C:\MyPackage\ \__init__.py \justPrintHelloWorld.py \multiply5By10.py Would I expect the following behavior?: import MyPackage MyPackage.justPrintHelloWorld Hello World MyPackage.multiply5by10 50 -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem reading/writing files
have you been using text mode? [EMAIL PROTECTED] wrote: This is a bit of a peculiar problem. First off, this relates to Python Challenge #12, so if you are attempting those and have yet to finish #12, as there are potential spoilers here. I have five different image files shuffled up in one big binary file. In order to view them I have to unshuffle the data, which means moving bytes around. Currently my approach is to read the data from the original, unshuffle as necessary, and then write to 5 different files (2 .jpgs, 2 .pngs and 1 .gif). The problem is with the read() method. If I read a byte valued as 0x00 (in hexadecimal), the read method returns a character with the value 0x20. When printed as strings, these two values look the same (null and space, respectively), but obviously this screws with the data and makes the resulting image file unreadable. I can add a simple if statement to correct this, which seems to make the .jpgs readable, but the .pngs still have errors and the .gif is corrupted, which makes me wonder if the read method is not doing this to other bytes as well. Now, the *really* peculiar thing is that I made a simple little file and used my hex editor to manually change the first byte to 0x00. When I read that byte with the read() method, it returned the correct value, which boggles me. Anyone have any idea what could be going on? Alternatively, is there a better way to shift about bytes in a non-text file without using the read() method (since returning the byte as a string seems to be what's causing the issue)? Thanks in advance! -- http://mail.python.org/mailman/listinfo/python-list
Re: gaierror: (8, 'hostname nor servname provided, or not known')
my boss has a similar problem with his home internet connection in
general. he traced it back to his router, which was in the first couple
generations of routers. how old are the routers you tested this on?
aside from upgrading them, if they are the problem, i can suggest a
workaround.
the first time this exception is raised, your script can automatically
restart itself.
os.system('python -c import time, os; time.sleep(2);
os.system(\'python yourscriptname.py \') ')
sys.exit(1)
Laszlo Nagy wrote:
Hello,
I asked this question about a week ago, but I did not provide a
traceback. Here is the traceback:
File /usr/local/lib/python2.4/xmlrpclib.py, line 1096, in __call__
return self.__send(self.__name, args)
File /usr/local/lib/python2.4/xmlrpclib.py, line 1383, in __request
verbose=self.__verbose
File /usr/local/lib/python2.4/xmlrpclib.py, line 1129, in request
self.send_content(h, request_body)
File /usr/local/lib/python2.4/xmlrpclib.py, line 1243, in send_content
connection.endheaders()
File /usr/local/lib/python2.4/httplib.py, line 798, in endheaders
self._send_output()
File /usr/local/lib/python2.4/httplib.py, line 679, in _send_output
self.send(msg)
File /usr/local/lib/python2.4/httplib.py, line 646, in send
self.connect()
File /usr/local/lib/python2.4/httplib.py, line 1072, in connect
sock.connect((self.host, self.port))
File string, line 1, in connect
gaierror: (8, 'hostname nor servname provided, or not known')
The program is connecting to the same host about 2 times per minute.
After running for one or two hours, it raises this exception. Once it
raised this exception, it keeps raising in. (My program is trying to
connect but it cannot.) Then I restart my program and it works for
anoter hour or two. I tried the same program on different machines and
different operating system, but the error is always the same. Please
help me identify the problem.
Thanks,
Laszlo
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Re: class variables
python != java. when you say self.v = ..., you mask the class attribute with an instance attribute. say C1.v = Colin J. Williams wrote: Andre Meyer wrote: Hi all I am trying to understand the magic of Python's class variables and tried the following code (see below). Just out of curiosity, I tried to define a property that provides access to a seemingly instancae variable which is in fact a class variable. All seems to work fine (case 4), but when a custom object is assigned, an instance variable is created instead of using theproerty (case 5). What goes wrong here? What is the difference between cases 4 and 5? How can case 5 be fixed? thanks a lot for your help Andre Code Listing = print; print *** Case 1 ***; print class C1(object): v = None def __init__(self, value): print '-', self.v self.v = value def value(self): return self.v a1 = C1(1) b1 = C1(2) print a1.value() print; print *** Case 2 ***; print class C2(object): v = None def __init__(self, value): print '-', self.v self.__class__.v = value def value(self): return self.__class__.v a2 = C2(1) b2 = C2(2) print a2.value() print; print *** Case 3 ***; print class C3(object): v = 5 def __init__(self, value): print '-', self.v self.v = self.v + value def value(self): return self.v a3 = C3(1) b3 = C3(2) print a3.value() print a3.v print a3.__class__.v print; print *** Case 4 ***; print class V4(list): def work(self): return 'done' class C4(object): def __set_v(self, v): self.__class__.__v = v def __get_v(self): return self.__class__.__v def __del_v(self): del self.__class__.__v v = property(__get_v, __set_v, __del_v, 'make class variable') v = V4() def __init__(self, value): print '-', self.v self.v.append(value) print '+', self.v @classmethod def value(self): print self.v.work() return self.v a4 = C4(1) b4 = C4(2) print a4.value() print a4.v print a4.__class__.v print a4.v.work() print; print *** Case 5 ***; print class V5(object): def __init__(self, i): self.i = i def work(self): return 'done', self.i class C5(object): def __set_v(self, v): self.__class__.__v = v def __get_v(self): return self.__class__.__v def __del_v(self): del self.__class__.__v v = property(__get_v, __set_v, __del_v, 'make class variable') v = None def __init__(self, value): print '-', self.v self.v = V5(value) print '+', self.v #print self.__class__.__dict__ #print self.__dict__ @classmethod def value(self): print self.v.work() return self.v a5 = C5(1) b5 = C5(2) print a5.value() print a5.v print a5.__class__.v print a5.v.work() Output = *** Case 1 *** - None - None 1 *** Case 2 *** - None - 1 2 *** Case 3 *** - 5 - 5 6 6 5 *** Case 4 *** - [] + [1] - [1] + [1, 2] done [1, 2] [1, 2] [1, 2] done *** Case 5 *** - None + __main__.V5 object at 0x00AFE0D0 - None + __main__.V5 object at 0x00AFE110 Traceback (most recent call last): File classvariables.py, line 121, in ? print a5.value () File classvariables.py, line 115, in value print self.v.work() AttributeError: 'NoneType' object has no attribute 'work' André, I would have expected a5.v to be equal to b5.v, otherwise what is the value of a class variable? I get: [Dbg] a5.v == b5.v False I hope that one of the wizards will respond. Colin W. -- http://mail.python.org/mailman/listinfo/python-list
Re: Small problem with print and comma
why don't you iterate over the list instead of indices? for elem in L: print elem, you don't need the 0 when you call range: range(0, n) == range(n) the last element of a range is n-1: range(n)[-1] == n-1 you don't need while to iterate backwards. the third argument to range is step. range(n-1, -1, -1) == [n-1, n-2, n-3, ..., 1, 0] [EMAIL PROTECTED] wrote: Hi, I have a small problem with my function: printList. I use print with a ',' . Somehow the last digit of the last number isn't printed. I wonder why. import random def createRandomList(param): length = param a = [] creating random list for i in range(0,length): a.append(random.randrange(100)) return a def printList(param): #doesn't work #2 sample outputs # 30 70 68 6 48 60 29 48 30 38 #sorted list #6 29 30 30 38 48 48 60 68 7 --- last character missing #93 8 10 28 94 4 26 41 72 6 #sorted list #4 6 8 10 26 28 41 72 93 9 -- dito for i in range(0,len(param)): print a[i], #works #for i in range(0,len(param)-1): # print a[i], #print a[len(param)-1] if __name__ == __main__: length = 10 a = createRandomList(length) printList(a) for j in range(1,len(a)): key = a[j] i = j-1 while i -1 and a[i]key: a[i+1] = a[i] i = i-1 a[i+1] = key print \n sorted list printList(a) -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
cygwin http://www.cygwin.com/ try a few IDEs out to see which fits you best. IDLE ships with python, and isn't significantly objectively worse than any other python IDE, afaik. GUI designers aren't necessary because there's usually so little boilerplate code in any python toolkit, but, again, whatever works best for you. [wait, will you be running a GUI on a webhost?] if you haven't selected a web framework, may i steer you towards cherrypy? it stays out of your way more than any other web framework i've tried. and i'm using it now to build a databased web-app for my college. http://www.cherrypy.org/ Vincent Delporte wrote: Hello I'm thinking of using Python to build the prototype for a business web appplication. The development and test machine is XP, while ultimate deployment will be on a shared Unix web host. What would you recommend I get, besides the Python engine itself? Good IDE (Kodomo?) ? Some kind of GUI designer? Add-on's? Other tools? Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: list of lists of lists ....
recursion. def get_As(L): res = [] for elem in L: if isinstance(elem, A): res.append(elem) elif isinstance(elem, list): res += get_As(elem) return res i also have a Tree class in my rc: http://home.comcast.net/~faulkner612/programming/python/pythonrc.py yomgui wrote: Hi, I have a list of data (type A) my list can includes element of type A or a lists, these list can includes element of type A or a lists, and so on ... is there a simple way to obtain a single list of all the elemets of type A ? thanks yomgui -- http://mail.python.org/mailman/listinfo/python-list
Re: list of lists of lists ....
doh. ok, so, recursion is just functional programming sugar for a loop. def get_As(L): checking = [elem for elem in L if isinstance(elem, list)]# the equivalent of elem in recursion all_As = [elem for elem in L if isinstance(elem, A)] while checking: new_checking = [] # all lists in all lists in checking for sub_L in checking: for elem in sub_L: if isinstance(elem, A): all_As.append(elem) elif isinstance(elem, list): new_checking.append(elem) checking = new_checking return all_As yomgui wrote: I forgot the most important, I am looking for a non recursive method. thanks yomgui yomgui wrote: Hi, I have a list of data (type A) my list can includes element of type A or a lists, these list can includes element of type A or a lists, and so on ... is there a simple way to obtain a single list of all the elemets of type A ? thanks yomgui -- http://mail.python.org/mailman/listinfo/python-list
Re: Client/Server Question
i highly doubt it.
http://www.google.com/search?domains=www.python.orgsitesearch=www.python.orgsourceid=google-searchq=os+system+deprecatesubmit=search
[EMAIL PROTECTED] wrote:
Is os.system() going to be deprecated in future ?.I read somewhere.
Dennis Benzinger wrote:
[EMAIL PROTECTED] wrote:
My server.py looks like this
-CODE--
#!/usr/bin/env python
import socket
import sys
import os
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ''
port = 2000
s.bind((host,port))
s.listen(1)
conn, addr = s.accept()
print 'client is at', addr
while True:
data = conn.recv(100)
if (data == 'MaxSim'):
print 'MaxiSim'
os.system('notepad')
elif (data == 'Driving Sim'):
print 'Driving Sim'
os.system('explorer')
elif (data == 'SHUTDOWN'):
print 'Shutting down...'
os.system('shutdown -s')
conn.close()
break
---CODE
END-
I am running this above program on a windows machine. My client is a
Linux box. What I want to achieve is that server.py should follows
instructions till I send a 'SHUTDOWN' command upon which it should shut
down.
When I run this program and suppose send 'MaxSim' to it, it launches
notepad.exe fine, but then after that it doesn't accept subsequent
command. I want is that it should accept subsequent commands like
Driving Sim and launch windows explorer etc untill I send a 'SHUTDOWN'
command.
Any help on this, it will be greatly appreciated.
os.system() blocks until the called program has finished. Use the
subprocess module http://docs.python.org/lib/module-subprocess.html:
untested_code
import subprocess
subprocess.Popen(notepad)
/untested_code
Dennis
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Re: Client/Server Question
you might want to look at sshd. if you're on a windows box, you may
need cygwin. if you're on linux, you either already have it, or it's in
your package manager.
[EMAIL PROTECTED] wrote:
My server.py looks like this
-CODE--
#!/usr/bin/env python
import socket
import sys
import os
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ''
port = 2000
s.bind((host,port))
s.listen(1)
conn, addr = s.accept()
print 'client is at', addr
while True:
data = conn.recv(100)
if (data == 'MaxSim'):
print 'MaxiSim'
os.system('notepad')
elif (data == 'Driving Sim'):
print 'Driving Sim'
os.system('explorer')
elif (data == 'SHUTDOWN'):
print 'Shutting down...'
os.system('shutdown -s')
conn.close()
break
---CODE
END-
I am running this above program on a windows machine. My client is a
Linux box. What I want to achieve is that server.py should follows
instructions till I send a 'SHUTDOWN' command upon which it should shut
down.
When I run this program and suppose send 'MaxSim' to it, it launches
notepad.exe fine, but then after that it doesn't accept subsequent
command. I want is that it should accept subsequent commands like
Driving Sim and launch windows explorer etc untill I send a 'SHUTDOWN'
command.
Any help on this, it will be greatly appreciated.
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Re: Looking for a regular expression for this...
idk, most regexes look surprisingly like undergrowth. malahal, why don't you parse s into a dict? read each couple of lines into a key-value pair. John Machin wrote: [EMAIL PROTECTED] wrote: Hi, My string is a multi line string that contains filename filename\n and host host\n entries among other things. For example: s = filename X host hostname1 blah... host hostname2 blah... filename Y host hostname3 Given a host name, I would like to get its filename (The closest filename reading backwards from the host line). I could read each line until I hit the host name, but I am looking for an RE that will do job. Looking for? REs don't lurk in the undergrowth waiting to be found. You will need to write one (unless some misguided person spoon-feeds you). What have you tried so far? The answer should be Y for host hostname3 and X for either host hostname1 or hostname2. Thanks in advance. --Malahal. -- http://mail.python.org/mailman/listinfo/python-list
Re: binding more than one attribute in a facntion
http://cheeseshop.python.org/pypi/functional learn lisp/scheme! http://cs.wwc.edu/KU/PR/Scheme.html Peter Otten wrote: [EMAIL PROTECTED] wrote: I want to have a bound method that fixes more than one parmeter of a funtion. LEt me post an example. def f(a, b, c): return a + b + c I can do: fplus10 = f(10) and then call f with 2 params and it works. But, how can I fix 2 params: fplus10plus20 = f(10,20) ignores the second param. fplus10plus20= fplus10(20) does not work either. Can anybody show what I'm doing wrong? Bound methods are limited to one implicit parameter. What you need is partial function application: def f(a, b, c): ... return a + b + c ... def partial(f, *args): ... def g(*more): ... return f(*args+more) ... return g ... partial(f, 1, 2)(3) 6 partial(f, 1)(2, 3) 6 partial(f)(1, 2, 3) 6 See http://www.python.org/dev/peps/pep-0309/ for more. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: splitting words with brackets
re.findall('\([^\)]*\)|\[[^\]]*|\S+', s)
Qiangning Hong wrote:
I've got some strings to split. They are main words, but some words
are inside a pair of brackets and should be considered as one unit. I
prefer to use re.split, but haven't written a working one after hours
of work.
Example:
a (b c) d [e f g] h i
should be splitted to
[a, (b c), d, [e f g], h, i]
As speed is a factor to consider, it's best if there is a single line
regular expression can handle this. I tried this but failed:
re.split(r(?![\(\[].*?)\s+(?!.*?[\)\]]), s). It work for (a b) c
but not work a (b c) :(
Any hint?
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Re: splitting words with brackets
er,
...|\[[^\]]*\]|...
^_^
faulkner wrote:
re.findall('\([^\)]*\)|\[[^\]]*|\S+', s)
Qiangning Hong wrote:
I've got some strings to split. They are main words, but some words
are inside a pair of brackets and should be considered as one unit. I
prefer to use re.split, but haven't written a working one after hours
of work.
Example:
a (b c) d [e f g] h i
should be splitted to
[a, (b c), d, [e f g], h, i]
As speed is a factor to consider, it's best if there is a single line
regular expression can handle this. I tried this but failed:
re.split(r(?![\(\[].*?)\s+(?!.*?[\)\]]), s). It work for (a b) c
but not work a (b c) :(
Any hint?
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Re: Search within running python scripts
IPC via files, sockets, and shared memory are all readily available in
python.
the simplest way is to have the script write its pid to a certain file.
pidfn = '/tmp/hellowerld_ipc_pid'
if os.path.isfile(pidfn):
f = file(pidfn)
pid = f.read()
f.close()
if pid in os.popen('ps -A -o pid').read():
print another instance of me is running!
else:
f = file(pidfn, 'w')
f.write(str(os.getpid()))
f.close()
gmax2006 wrote:
Hi,
Is it possible that a python script finds out whether another instance
of it is currently running or not?
Thank you,
Max
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Re: Note on PEP 299
http://home.comcast.net/~faulkner612/programming/python/mainer.py turns if __name__ == '__main__': sys.exit(main(sys.argv)) into import mainer [EMAIL PROTECTED] wrote: I don't like much the syntax of: if __name__ == '__main__': Some time ago I have read this PEP: http://www.python.org/dev/peps/pep-0299/ And why it was refused: http://mail.python.org/pipermail/python-dev/2006-March/062955.html I think the name of the standard main function may be just main(), so there isn't the problem with the import (and *maybe* the problem with multiple Python versions can be ignored with Python 3.0). If a module contains the main(), the main() is executed when the module is run alone. Otherwise you can import the module, with the main() function managed as a normal function. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: Python newbie needs constructive suggestions
optional arguments. map(lambda x, one=1: x + one, ...) it is entirely possible, however, to implement let in python. def let(**kw): sys._getframe(2).f_locals.update(kw) def begin(*a): return a[-1] map(lambda x: begin(let(one=1), x+one), range(10)) i really should warn you, though, that most pythoneers will cringe at code like that, no matter how well they understand it. write python in python, and you'll have more friends. [EMAIL PROTECTED] wrote: What is the idiomatically appropriate Python way to pass, as a function-type parameter, code that is most clearly written with a local variable? For example, map takes a function-type parameter: map(lambda x: x+1, [5, 17, 49.5]) What if, instead of just having x+1, I want an expression that is most clearly coded with a variable that is needed _only_ inside the lambda, e.g. if I wanted to use the name one instead of 1: map(lambda x: (one = 1 x+one), [5, 17, 49.5]) This sort of thing is of course straightforward in many other languages with anonymous functions (Scheme, Haskell, Smalltalk, etc), and I saw in the archives the discussion from 2003 about How do I get Scheme-like let bindings in Python. Many of the answers seem to boil down to You should not write Scheme programs in Python, you should write Python programs in Python. As someone new to Python, I'd like a little more detail on this, so I'm asking _what_ I should do when I want to pass, to something like map, code that is most clearly expressed with a local variable? Do I a) give up on using a local variable and just substitute the value in its place (going back to my original use of map), b) give up on using an anonymous function and create a named successor function with def, c) give up on making one local to the lambda and create it in the scope in which I'm calling map, even if I don't otherwise need it there, d) give up on using Python and go back to Scheme, or e) do something else clever and Pythonic that I don't know about yet? What is the idiomatically correct way to do this in Python? Thanks for any constructive advice you can give, Dave Wonnacott P.S., For those who want a bit more context about what I'm doing, I'll provide it -- anyone else is welcome to skip the rest of this message. As you may guess, I am in the process of learning Python. I have some experience with C/C++ and Scheme and other forms of Lisp, as well as passing familiarity with a bunch of other languages. I teach an introductory CS course in which I cover a variety of topics that I believe are central to computer science and can be expressed in any language, such as algorithm design, unit and integration testing, writing code that maintains an invariant property of a set of variables. However, I do not like the language-free or all-pseudocode approach to teaching -- I believe all examples should be shown in a real language, and that the code should be as true to the customary idioms of that language as possible. This limits my choice of language somewhat, since I include elements of functional programming, imperative programming, and object-oriented programming -- I'm not happy doing things like cramming functions into unnecessary classes in Java. However, I currently believe that Python will be at least as good as C++ for what I want to do, and am exploring the details of how it would work out. One of the things I'm doing is discussing various styles of thinking about the execution of an algorithm, specifically as a process of textual substitution of equals for equals (as one would generally do in Haskell or other functional languages, or in mathematics) or a sequence of ordered steps to be followed (as one would generally do in imperative languages). Note that, while Haskell programmers may say that substitution is the true way that their programs are executed, and C++ programmers may say that a sequence of ordered steps is what's really going on, the actual process of going from your source code to the output of your program can be blending of these two techniques -- for example, a C++ compiler may perform substitution where it is legal to do so, producing a machine language program that is executed _mostly_ in order (though a processor may commute the order of execution where it is legal to do so). Anyway, in almost any language, there are _some_ ways to per! fo! rm substitutions without changing the result of a piece of code (e.g. substituting the value of a variable that is only assigned once, for each of its uses), and some things that can be visualized in terms of execution of steps even if one wishes to do so (even in a language like Haskell). The question of the use of variables inside a lambda is relevant to my understanding of the contexts in which one can think of Python programs in terms of substitution,
Re: restricted environment
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/496746 When you think of modifying the interpreter, think of the compiler module. Gabriele *darkbard* Farina wrote: Hi, I saw the rexec module is deprecated. I need to develop a python application able to run custom python code based on a configuration file that tells the path of the script that have to be executed. Those scripts can be runned simultaneously trought threading module, but the MUST not have any way to change the base application nor the other scripts behaviour. There is a way to reach this point without using rexec? There is a way to start a python interpreter from python to run the scripts? My final goal is to develop a simple fastcgi script that, based on configuration files, is able to host different applications without need to copy the script for any application and with any risk that the scripts will ifluence in any way each other. Any help? Gabriele -- http://mail.python.org/mailman/listinfo/python-list
Re: tkinter help
add a xscrollcommand and/or yscrollcommand keyword argument to the construction of your listbox. def func(*a): print i'm a callback! L = Tkinter.Listbox(root, yscrollcommand=func)# note no parens after func groves wrote: hi eveyrbody , i have started working on python tkinter, While I was working on one of the tkinter classes..named listbox widget. I had a slight problem. Now let me tell you that i was able to create a simple listbox which had 6 options which one can select, but Now what I want is that from the available menu, if I select an option it should give me another menu associated with that option. Its like digging up that option to do advance search. Please I need help as I am making my project Thanks to eveyrbody who will take time to read this and solve it . -- http://mail.python.org/mailman/listinfo/python-list
Re: Starting a GUI application out of an console application
put your gui application in another script and start it the same way you'd start any other application whose exit status you didn't need: os.popen* or subprocess.Popen. or, use the threading module to give your qt application another thread. Fabian Steiner wrote: Hello! I am currently working on an alternative for the gnome-volume-manager for multiseat systems based on HAL and DBus. Whenever the signal 'DeviceAdded' is received I would like to start a GUI-Interface where the user can choose from different options. But now I am wondering how I should start this interface since this GUI must be started by a console daemon. What is the most common way to do that? Usually, I start a PyQt application that way: app = QApplication(sys.argv) ui = Dialog() app.setMainWidget(ui) ui.show() app.exec_loop() If I start it that way, I am not quite sure whether this will work since I have got two main loops then (the one of console daemon [implemented by using gobject.MainLoop().run()] and the Qt one). Moreover, once the Qt application is started, it should run independently of the console daemon. Unfortunately, I can't think of any possibility to achieve this aim. Do you have any suggestions? -- http://mail.python.org/mailman/listinfo/python-list
Re: help!
os.popen* os.system subprocess.Popen Emily Ecoff wrote: Hi all. I am somewhat new to the python programming language but I'm working on a python script that will call several csh scripts. What commands will I need to do this, if possible? -Emily -- http://mail.python.org/mailman/listinfo/python-list
Re: threading troubles
you don't need twisted to run processes in the background, either.
os.popen* returns a file or set of files representing std streams
immediately
subprocess.Popen is a spiffy little object new in 2.4 and available for
download for 2.3. check the module docstrings for usage tips.
you can use threads, but try doing it the python way instead of the
java way. ;-)
def func(cmd, callback):
os.system(cmd)
callback()
xc = threading.Thread(target=func, args=(cmd, callback))
xc.start()
sreekant wrote:
Hi folks
What am I doing wrong in the following? I just want to run fluidsynth in
the background.
#
class MyThread(threading.Thread):
def __init__(self, cmd, callback):
self.__cmd = cmd
self.__callback = callback
threading.Thread.__init__(self)
def run(self):
os.system(self.__cmd)
self.__callback('abcd')
return
cmd=midiplay+' '+fmidi
xc=MyThread(cmd,addlog)
xc.start()
##
midiplay is 'fluidsynth -ni /home/mysndfont.sf2 mymidi.mid'
addlog is a function which prints the log.
If I run it only with xc.start() it does not run the program as in
os.system. However if I put
xc.start()
xc.run()
then it starts and runs it in foreground with my pygtk ui non responsive.
What am I missing!
Thanks for any ideas
sree
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Re: WANTED: logging of all file operations on Windows
you want a directory watching daemon. it isn't hard at all to build from scratch. first, determine which directories should be watched. then, os.walk each directory, building a mapping from filename to mtime [modified time; os.path.getmtime]. next is your main event loop. this while loop consists of os.walk-ing each directory again, comparing the current mtime to the corresponding entry in the mapping. if they differ, or if a filename isn't in the mapping, something happened, at which point you can logick out whether a file was moved, deleted, changed, or created. so many folks have looked for this that i'll just write a generic one and put it in the cheeseshop. look for dirmon in about a week. Claudio Grondi wrote: I am aware, that it is maybe the wrong group to ask this question, but as I would like to know the history of past file operations from within a Python script I see a chance, that someone in this group was into it already and is so kind to share here his experience. I have put already much efforts into this subject googling around, but up to now in vain. Best option I encountered yet is usage of the Greyware 'System Change Log' service which monitors disks for changes (http://www.greyware.com/software/systemchangelog/index.asp), but in own tests it turned out, that the created log file does not cover all file events as e.g. it is not possible to detect when a file is moved to a new directory (creation of a new file is logged, but deletion is not, not mentioning I would expect a file 'move' event). The own Windows logging service rejected to start on my XP SP2 system for unknown to me reasons - I don't know how to get it to work (yes, I have used the administrator account). I can't believe, that using NTFS file system in Microsoft Windows 2000 or XP it is not possible to track file events as: - updating/modifying of an existing file/directory - deleting an existing file/directory - creating a new file/directory - _moving_ an existing file/directory (should _NOT_ be covered by the event duo of deleting an existing and creating a new file/directory) Any hints towards enlightenment? Claudio Grondi -- http://mail.python.org/mailman/listinfo/python-list
Re: split a line, respecting double quotes
import re
re.findall('\.*\|\S+', raw_input())
Jim wrote:
Is there some easy way to split a line, keeping together double-quoted
strings?
I'm thinking of
'a b c d e' -- ['a','b','c','d e']
. I'd also like
'a b c d \ e' -- ['a','b','c','d e']
which omits any s.split('')-based construct that I could come up with.
Thank you,
JIm
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Re: split a line, respecting double quotes
sorry, i didn't read all your post.
def test(s):
res = ['']
in_dbl = False
escaped = False
for c in s:
if in_dbl:
if escaped:
res[-1] += c
if c != '\\':
escaped = False
else:
res[-1] += c
if c == '\\':
escaped = True
elif c == '':
res.append('')
in_dbl = False
elif c == ' ':
res.append('')
elif c == '':
res.append('')
res[-1] += c
in_dbl = True
else:
res[-1] += c
while '' in res:
res.remove('')
return res
faulkner wrote:
import re
re.findall('\.*\|\S+', raw_input())
Jim wrote:
Is there some easy way to split a line, keeping together double-quoted
strings?
I'm thinking of
'a b c d e' -- ['a','b','c','d e']
. I'd also like
'a b c d \ e' -- ['a','b','c','d e']
which omits any s.split('')-based construct that I could come up with.
Thank you,
JIm
--
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Re: Perl Dictionary Convert
data.replace('=', ':').replace(';', ',')
then eval in a namespace object whose __getitem__ method returns its
argument unchanged.
class not_str(str):# take care of that IPF.Contact
def __getattr__(self, attr):return self + '.' + attr
class not_dict(dict):
def __getitem__(self, name):return not_str(name)
eval(data.replace('=',':').replace(';', ','), not_dict())
Tom Grove wrote:
I have a server program that I am writing an interface to and it returns
data in a perl dictionary. Is there a nice way to convert this to
something useful in Python?
Here is some sample data:
200 data follow
{
Calendar = {
Access = { anyone = lr;};
Class = IPF.Appointment;
Messages = 0;
Size = 0;
UIDNext = 1;
UIDValidity = 287898056;
Unseen = 0;
};
Contacts = {
Class = IPF.Contact;
Messages = 0;
Size = 0;
UIDNext = 1;
UIDValidity = 287898056;
Unseen = 0;
};
}
-Tom
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Re: import
that should be __init__.py [TWO underscores]. and you might want to import sys and check sys.path [the list of directories searched by the import mechanism]. David Jackson wrote: Hi all, I'm a real beginner with python but have what I think is a simple question. I am writing some simple modules and would like to place them into a subdirectory. But then I cannot seem to import them. I have tried the following. I wrote a module called fibo.py with some definitions in it (one called fibo). In the same directory, I wrote another file (test.py) and began with import fibo. This worked fine and I was able to use the function fibo as fibo.fibo. Then, I made a directory called test and placed the file fibo.py in this directory. I also placed a blank file called _init_.py into this directory. I went back to the original directory and tried to import test.fibo but this fails. I get the following error message: Traceback (innermost last) File ...test.py, line 1, in ? import test.fibo File ...test.py, line 1, in ? import test.fibo ImportError: No module named fibo Any help would be greatly appreciated. If it makes any difference, I'm working on a Mac, OSX 10.3.9 Thanks, David -- http://mail.python.org/mailman/listinfo/python-list
Re: cas in python
import ctypes
ctypes.cdll.find('ginac')
i like designing APIs, and i'm up for learning ctypes, so i'll help
wrap ginac using ctypes.
[EMAIL PROTECTED] wrote:
Hello,
from time to time, people here are asking about the computer algebra
system (cas) in python. I wonder, is there a demand for such a thing?
I would be interested in functionality of at least ginac, but
something, which could easily be extended. Ginac (pyginac or swiginac)
are fine, but it seems to me to be too complex and contains a lot of
redundant code (imho). What I need is not a speed in the first place,
but rather rich features and simple code which I (and others) can
extend. I would like to experiment with new features, functions, etc.,
but using a normal language like python (or c++). Which is quite
difficult in ginac or maple/mathematica.
I also (like other people here) wrote a proof of concept a year ago:
http://ondrej.certik.cz/cas.php
and I also (like others) don't have much time to continue on it. On the
other hand, it really does seem possible to write it in a way, which is
very easy to understand, yet feature rich.
So if anyone is interested in developing such a thing, please let me
know. Or at least what you think about it - does it make sense to write
another cas?
Ondrej
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Re: Can I do it using python?? about xterm and telnet
try pexpect. http://pexpect.sourceforge.net/ valpa wrote: I'm a net admin for about 20 unix servers, and I need to frequently telnet on to them and configure them. It is a tiring job to open a xterm and telnet, username, password to each server. Can I do it automatically by python? After that, there have 20 xterm consoles opened and telneted to their corresponding servers. Then I could start to type command in these xterms. Any suggestion appreciate. Much thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can I do it using python?? about xterm and telnet
try pexpect. http://pexpect.sourceforge.net/ valpa wrote: I'm a net admin for about 20 unix servers, and I need to frequently telnet on to them and configure them. It is a tiring job to open a xterm and telnet, username, password to each server. Can I do it automatically by python? After that, there have 20 xterm consoles opened and telneted to their corresponding servers. Then I could start to type command in these xterms. Any suggestion appreciate. Much thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python sub-interpreter, security
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/496746 [EMAIL PROTECTED] wrote: Hello, I am writing a pure-Python game engine that interprets the code of game objects within the same process with the exec statement. My main goal is to make as much power available as possible and exec seems like the best way to do that. This is my proof-of-concept code(only 18 lines and some whitespace, including the test): http://people.ucsc.edu/~jhofmann/programmables.py I showed this to the Pygame list and recieved some interest and a completely different, more sophisticated implementation: http://codereactor.net/~shang/interpret/ As-is, both versions are wide-open security holes. I think that I can patch them up if I run checks on the statements and eliminate all language features that pose risks. Then, features that are useful but not needed at their full capacity can be accessed through functions designed to be secure. Forcing a crash is not considered an exploit for this purpose(since it's a game engine - if it crashes, the user can recover and lose no data) What I'd like to know is, is it possible to meet this level of security, and if so, which features have to be eliminated? The two that I'm sure should go are module imports and self-modifying code. But in the latter case, I don't know all the ways that might be done. It seems like a very complicated problem, and if I can't solve it I might leave the whole thing unsecured. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python taught in schools?
Franklin W. Olin College of Engineering I TAed a python class last semester, and am using it to build a webapp for the Arts and Humanities dept. http://www.olin.edu MilkmanDan wrote: I'll be a college freshman this fall, attending Florida Institute of Tech studying electrical engineering. I was considering taking some classes in programming and computer science, and I happened to notice that everything taught is using C++. After further research, it seems to me that C++ seems to be the dominating language in universities. By comparison, our local community college teaches a few classes in VB, Java, Javascript, C++, and for some reason, PASCAL. I'm certianly not against any of this, but out of curiousity does anyone know of a school that teaches Python? -- http://mail.python.org/mailman/listinfo/python-list
Re: search engine
http://www.voidspace.org.uk/cgi-bin/pysearch/search.py http://www.voidspace.org.uk/ http://www.vex.net/parnassus/ http://cheeseshop.python.org/pypi http://aspn.activestate.com/ASPN/Cookbook/Python http://www.google.com vinodh kumar wrote: hai all, i am student of computer science dept. i have planned to design a search engine in python. i am seeking info about how to proceed further. i need to know what r the modules that can be used. - -- http://mail.python.org/mailman/listinfo/python-list
Re: Segmentation fault only on Iinux
if you don't know exactly which line of code causes the segfault, use print statements to determine that. then try to either redesign/refactor so that line isn't necessary, or protect its operation somehow. if you do know, tell us what it is and we might not need to see all your code. Kiran wrote: Hello All, In my program, I have a main thread which is the GUI (wxPython) and then a thread which goes and reads data from a socket. The reason this is in a different thread is because the data might take some time to come back, and I want to have the GUI to be responsive during this wait. When I run my program in Linux, a segmentation fault occurs. When I run it in Windows XP, it works just fine. The main thing that would be of interest is as follows: The segmentation fault does NOT occur if I disable the threads and read the data all in 1 thread (the main thread [gui's]). This leads me to believe it is some sort of threading problem related to linux. However, I personally dont think that it can be something wrong with my code, since my program runs perfectly fine in WindowsXP. I am also carefully protecting data that my threads share with the MainGUI using a Queue and also a semaphore lock. I know this is kind of hard to answer without any code, but would anybody know of some kind of issue such as this where there is some threading problems with Linux and not Windows. I am happy to send the code to anybody who wishes to see it. I havent posted it here because it is kind of lengthy. Also, I should note that I think we are running Linux Kernel 2.4 thanks a lot for your help, Kiran -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem Py2exe pygtk and Pil
read the py2exe docs. py2exe should put everything a new user should need in the dist directory. if it doesn't, copy the libraries [be they .pyc or .pyd or .dll] that py2exe missed into dist. i know for a fact that py2exe is intelligent with the gtk libraries, so check if the PIL libraries are in the dist directory. thomas carpentier wrote: Hello, I have created a program with a GUI ( glade). In this script I call the Python Imaging Library. I have developped this program onto linux, but il would like export it on Windows, however I have a problem with py2exe. If the new user has not python and library(PIL, GLADE) installed, it doesn't work. I don't know how integrate library into my setup. Thank you for your help. Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting external name of passed variable
import sys
tellme = lambda x: [k for k, v in sys._getframe(1).f_locals.iteritems() if
v == x]
a=1
tellme(a)
['a']
Michael Spencer wrote:
David Hirschfield wrote:
I'm not sure this is possible, but it sure would help me if I could do it.
Can a function learn the name of the variable that the caller used to
pass it a value? For example:
def test(x):
print x
val = 100
test(val)
Is it possible for function test() to find out that the variable it is
passed, x, was called val by the caller?
Some kind of stack inspection?
Perhaps, but don't try it ;-)
Any help greatly appreciated,
-David
Can't you use keyword arguments?
def test(**kw):
... print kw
...
test(val=3)
{'val': 3}
test(val=3, otherval = 4)
{'otherval': 4, 'val': 3}
Michael
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Re: Function definition
no. python is not C. python is interpreted, not compiled, so if you want a function to exist when you call it, you need to define it before you call it. it isn't clunky, it's just how it's done. if you want to define a 'main' function at the top of your script/module, go for it. then you can use this: if __name__ == '__main__': sys.exit(main(*sys.argv[1:])) aarondesk wrote: I have a little .py file that has the format: def fxn(a): do stuff other stuff ... r = fxn(a) Now I've tried putting the function declaration after the call but the program wouldn't work. Is there anyway to put function declarations at the end of the program, rather than putting them at the beginning, which is rather clunky? Thanks. Aaron -- http://mail.python.org/mailman/listinfo/python-list
Re: Passing data to system command
import os, subprocess
xys = [[1,2],[3,4]]
msg = '\n'.join([str(x) + ',' + str(y) for x, y in xys])
os.popen('command', 'w').write(msg)
os.popen2('command')[0].write(msg)
p = subprocess.Popen('command', stdin=subprocess.PIPE)
p.stdin.write(msg)
help(subprocess)
help(os.popen)
help(os.popen3)
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
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Re: Chess module blog
make psyco entirely optional by putting it in a try/except block. change INITIAL_BOARD to be a triple-quoted string. you seem to mostly follow pep8, which is all most folks ask, but i really like this style for docstrings: def test(): ''' hello, this text and the quotes line up very nicely in a monospace font. ''' return pep8 says function names shouldn't be capitalized, and use underscores to separate words, so they can be distinguished from classes [which are CamelCase] quickly. i would make a few small functions inside adjudicate for each cmd case, then make a dict mapping 'fen' to the function fen, 'reset' to the function reset, etc. faster and more modular. Will McGugan wrote: Hi folks, I have just blogged about a Python chess module of mine that I wrote a while back. I plan on using it for a commerical project, but making the module open source. So I would be interested in comments / advice reagarding programming style and also optimization. http://www.willmcgugan.com/2006/06/18/chesspy/ Regards, Will McGugan -- work: http://www.kelpiesoft.com blog: http://www.willmcgugan.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Video capture from webcam on Mac?
gstreamer has python bindings. http://gstreamer.net/ Joseph Chase wrote: Is there a cross-platform solution for video capture from a webcam? I am aware of the Win32 videocapture library, but am unaware of how to accomplish the same functionality on the Mac side. Thanks in advance. -- http://mail.python.org/mailman/listinfo/python-list
Re: Linux info
os.path.realpath
TheSaint wrote:
Hello there,
I still learning, but I couldn't find anything which tells me where a
symlink is pointing to.
A part of os.system('ls -l ' + path) and cutting down to the need, I haven't
got any specialized function.
F
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Re: what are you using python language for?
i'm writing a text editor [yes, it has quite a few interesting unique features]. URL:http://fauxlkner.sf.net this summer, i hope to make it collaborative like gobby. i also have a full-time job this summer at my college writing a small database system to manage student records. hacker1017 wrote: im just asking out of curiosity. -- http://mail.python.org/mailman/listinfo/python-list
Re: ConfigParser, no attribute
Settings.__init__ needs to call ConfigParser.SafeConfigParser.__init__
before it calls self.readfp.
Nexu wrote:
Hello,
I'm not sure exactly what i'm doing wrong here. I asked around on IRC
and i was told the code is correct.
The purpose of Settings() is that whenever Settings() or any of its
methods are called. It should pick up the latest settings from file
instead of returning what was in the buffer. This allow other scripts to
change the value and my program and pick these changes up.
Everything else should work exact same as ConfigParser().
-
class Settings(ConfigParser.SafeConfigParser):
def __init__(self):
self.filename = os.path.join(xchat.get_info('xchatdir'),
'nxscript',
'nxscript.conf')
try:
config_file = file(self.filename, 'r')
self.readfp(config_file, self.filename)
if self.sections() == []:
self.add_section('Global')
if self.has_section('Global'):
self.set('Global', 'ProtectME', 'false')
config_file.close()
except IOError:
nx.sysmsg('Configuration file not found')
def update_file(self):
try:
config_file = file(self.filename, 'w')
self.write(config_file)
except IOError:
nx.sysmsg('Could not write to configuration file')
-
SAMPLE CODE (what i want to able to do):
setting = Settings()
if setting.get('Global', 'ProtectME'):
print 'protection enabled'
-
ERRORS:
File /home/nexu/.xchat2/nxscript/nx.py, line 43, in ?
setting = Settings()
File /home/nexu/.xchat2/nxscript/nx.py, line 24, in __init__
self.readfp(config_file, self.filename)
File /usr/lib/python2.4/ConfigParser.py, line 286, in readfp
self._read(fp, filename)
File /usr/lib/python2.4/ConfigParser.py, line 451, in _read
if sectname in self._sections:
AttributeError: Settings instance has no attribute '_sections'
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Re: Adding attribute to objetcs
when you set an attribute of an object, python secretly calls that objects __setattr__ method. class test: def __setattr__(self, attr_name, attr_value): print self, attr_name, attr_value self.__dict__[attr_name] = attr_value# do what the original __setattr__ method does. test().fred = 'george'# prints test instance ... fred george Miguel Galves wrote: Hello, I`m starting to learn python, and I hava a very good background in Java and C/C++ programming. I was reading Dive into python chapter about OO and I saw that in python we can do the following: class Person: pass joe = new Person() joe.name = Joe joe.age = 13 It seems that it is possible to add attributes to any object instance in run time, as in Javascript. It seems to me that it can be a source of errors. One that come in my mind is the follwing: class Person: name = joe = new Person() joe.nome = Joe The code above adds an attribute called nome, but the programmer may think it's name. What is the real interest of this feature ? Is there a way to block this kind of error ? Thanks, Miguel -- Miguel Galves - Engenheiro de Computação Já leu meus blogs hoje? Para geeks http://log4dev.blogspot.com Pra pessoas normais http://miguelgalves.blogspot.com Não sabendo que era impossível, ele foi lá e fez... -- http://mail.python.org/mailman/listinfo/python-list
Re: re beginner
you could write a function which takes a match object and modifies d,
pass the function to re.sub, and ignore what re.sub returns.
# untested code
d = {}
def record(match):
s = match.string[match.start() : match.end()]
i = s.index('\t')
print s, i# debugging
d[s[:i]] = int(s[i+1:])
return ''
re.sub('\w+\t\d+\t', record, stuff)
# end code
it may be a bit faster, but it's very roundabout and difficult to
debug.
SuperHik wrote:
hi all,
I'm trying to understand regex for the first time, and it would be very
helpful to get an example. I have an old(er) script with the following
task - takes a string I copy-pasted and wich always has the same format:
print stuff
Yellow hat2 Blue shirt 1
White socks 4 Green pants 1
Blue bag 4 Nice perfume3
Wrist watch 7 Mobile phone4
Wireless cord!2 Building tools 3
One for the money 7 Two for the show4
stuff
'Yellow hat\t2\tBlue shirt\t1\nWhite socks\t4\tGreen pants\t1\nBlue
bag\t4\tNice perfume\t3\nWrist watch\t7\tMobile phone\t4\nWireless
cord!\t2\tBuilding tools\t3\nOne for the money\t7\tTwo for the show\t4'
I want to put items from stuff into a dict like this:
print mydict
{'Wireless cord!': 2, 'Green pants': 1, 'Blue shirt': 1, 'White socks':
4, 'Mobile phone': 4, 'Two for the show': 4, 'One for the money': 7,
'Blue bag': 4, 'Wrist watch': 7, 'Nice perfume': 3, 'Yellow hat': 2,
'Building tools': 3}
Here's how I did it:
def putindict(items):
... items = items.replace('\n', '\t')
... items = items.split('\t')
... d = {}
... for x in xrange( len(items) ):
... if not items[x].isdigit(): d[items[x]] = int(items[x+1])
... return d
mydict = putindict(stuff)
I was wondering is there a better way to do it using re module?
perheps even avoiding this for loop?
thanks!
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do you have a local copy of Lython?
# Lython = Miles Egan's Lisp-Python compiler. The usual place URL:http://www.caddr.com/code/lython/ throws a 404, and when I tried the email address in whois mailto:[EMAIL PROTECTED] the server threw an error. I've asked around on a few forums, and somebody on irc.efnet.org/python suggested posting here. If you have a saved copy, please email it to me or link me to a working download. Thanks for your time, faulkner -- http://mail.python.org/mailman/listinfo/python-list
Re: check for dictionary keys
def all(s):
for x in s:
if not x: return False
return True
bad_combos = [['-A', '-B'], ['-A', '-C'], ...]
for bad_combo in bad_combos:
assert not all([bad_elem in a for bad_elem in bad_combo])
[EMAIL PROTECTED] wrote:
hi
in my code, i use dict(a) to make to a into a dictionary , a comes
from user input, so my program does not know in the first place. Then
say , it becomes
a = { '-A' : 'value1' , '-B' : value2 , -C : value3 , '-D' :
'value4' }
somewhere next in my code, i will check for these..:
1) -A and -B cannot exist together
2) -A and -C cannot exist together
3) -A and -B and -D cannot exist together
4) and lots of other combinations to check for
how can i efficiently check for the above? At first as i do simple
checks , i use if and else.
But as i began to check for more combinatoiuns, it gets messy
thanks.
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Compiling
Pardon me if this has been done to death but I can't find a simple explanation. I love Python for it's ease and speed of development especially for the Programming Challenged like me but why hasn't someone written a compiler for Python? I guess it's not that simple eh? Simon -- http://mail.python.org/mailman/listinfo/python-list
Python on Windows
I've just written my first (simple) WxPython program - yy! What would folks suggest is the easiest way to package it to run on other windows PCs? I would love a single .exe file that would run without ANY OTHER FILES even if it was 50 Mb! TIA Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: Compiling
I love Python for it's ease and speed of development especially for the Programming Challenged like me but why hasn't someone written a compiler for Python? But there *is* a compiler for Python. http://www.python.org/doc/2.4.2/lib/module-compiler.html ty Bruno, I must confes that I don't understand much of that chapter! I will work harder... :-) -- http://mail.python.org/mailman/listinfo/python-list
CygWin ODBC
Hi All, I am new to Cygwin and am hoping that someone here will be able to tell me how to get ODBC running in Python on Cygwin. Maximum gratefullness... Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: CygWin ODBC
Steve Holden wrote: Simon Faulkner wrote: Hi All, I am new to Cygwin and am hoping that someone here will be able to tell me how to get ODBC running in Python on Cygwin. Maximum gratefullness... Simon There's a trick to this which involves recompiling from source. If you aren't experienced with Unix/Linux this might seem a bit intimidating. The latest version I worked on is mxODBC 2.0.7. If Egenix have released something later it may incorporate these changes. Sorry they aren't diff -c format. I also remember the need in the past to rename some .cpp files to .c, but I believe this has now been done in the distributions. regards Steve Cheers Steve, I will try that next week Ta :-) -- http://mail.python.org/mailman/listinfo/python-list
