[ANN] jsonrpclib-pelix 0.1.5
Hi, I'm glad to announce the release of jsonrpclib-pelix 0.1.5 ! What is it ? jsonrpclib-pelix is an implementation of the JSON-RPC specification. It supports both the original 1.0 specification, as well as the 2.0 specification, which includes batch submission, keyword arguments, etc. The suffix -pelix only indicates that this version works with Pelix Remote Services, but it is not a Pelix specific implementation. This version is a fork of Josh Marshal's jsonrpclib. It cannot be installed with the original version, as it uses the same package name. This project is under Apache License 2.0. It is available on PyPI: https://pypi.python.org/pypi/jsonrpclib-pelix The source code is on GitHub: https://github.com/tcalmant/jsonrpclib What's new in 0.1.5 --- This is the second release of jsonrpclib-pelix, and the first one to be announced on this list. It adds the following features: * Support of Python 3 * Added support of the dispatch_method agument in SimpleJSONRPCDispatcher * Removed the support of Unix sockets * Added features from other forks: * Improved JSON-RPC 1.0 support * Less strict error response handling * New AppError exception raised if a RPC error code is not a pre-defined one * Support of custom headers sent in requests Enjoy, Thomas -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANN] MadPUG - A New Python Users' Group in Madison, WI
Hey all, I wanted to first announce a python users' group in Madison, WI and second ask that anyone with a desire to speak at the first meet-up get in touch. Devin Walters and I are using meetup.com to coordinate the event and would hope to start holding meet-ups on a regular basis. If you're interested please join the group here: http://www.meetup.com/MadPUG/ We would also be willing to use madi...@python.org which once hosted the list for a PUG in Madison (but seems rather inactive) if the python community would like. Cheers! Ian --- https://github.com/sigmavirus24 https://bitbucket.org/icordasc -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
ANN: Bubbles 0.1 – Virtual Data Object Framework
Hi, I'm happy to announce new Python data framework: Bubbles Motto: Focus on the process, not the data technology. Blog post: http://blog.databrewery.org/posts/bubbles-0-1-released.html Here is a short presentation of the core concepts: http://www.slideshare.net/Stiivi/data-brewery-2-data-objects The concepts are: * data objects – abstraction of tabular data, one object might have multiple representations at once (SQL, iterator, ...) * data stores – abstraction of dataset collections * operations (performing on top of representations) and execution context (with operation catalog) * processing pipelines Priorities of the framework are: * understandability of the process * auditability of the data being processed (frequent use of metadata) * usability * versatility Working with data: * keep data in their original form. For example: represent data by a SQL statement and do not touch neither move around data if not necessary. * use native operations if possible: compose SQL statements, chain python iterators, compose APIs * performance provided by technology: SQL optimizer should know the best * have options – custom operations are easy to create Bubbles is performance agnostic at the low level of physical data implementation. Performance should be assured by the data technology and proper use of operations. Summary of current operations: http://www.scribd.com/doc/147247069/Bubbles-Brewery2-Operations More will come, at least basic Mongo ops are planned for 0.2. Github: https://github.com/Stiivi/bubbles If you have any comments, suggestions or questions, let me know. Cheers, Stefan -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
devpi-0.9.2: uploading existing archives files
devpi, the caching pypi server and its optional upload/test/install helper tool, just got a devpi-0.9.2 release. See the full updated docs here: http://doc.devpi.net Apart from some streamlining, there is a new upload option:: devpi upload --from-dir path/to/dir [--only-latest] which uploads existing release files to a devpi index, optionally only the latest versions. This is achieved with the help of ``pkginfo`` extracting PKGINFO files and, for the few where it's missing, using the filename to determine name/version data. Thanks to Anthon van der Neut for his related PRs. See below for a more detailed changelog. best, holger 0.9.2 (compared to 0.9.1) server: - fix /USER/INDEXNAME root views to contain only latest in-stage packages - make +api calls return bases so that devpi use can show them client: - introduce devpi upload --fromdir for uploading archives in bulk mode, thanks to Anthon van der Neut for helping with this! (resolved issue5) - improve automatic server handling via devpi use - for devpi server you now need to specify --log to see log lines - make devpi use also show base indexes by default - fix issue4: auto-server data stored in non-dot dir -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
XMLtoPDFBook v1.1 released: Create simple PDF books from XML text content
XMLtoPDFBook v1.1 released: XMLtoPDFBook is a program that lets you create simple PDF books from XML text content, including support for chapter numbers and names, headers and footers, automatic pagination, and page numbers. Please see this blog post about XMLtoPDFBook: XMLtoPDFBook now supports chapter numbers and names: http://jugad2.blogspot.in/2013/06/xmltopdfbook-now-supports-chapter.html XMLtoPDFBook is not separately released as a stand-alone product; I've added it as one of the components of my larger xtopdf project. But you can use it as a separate product, once you install the prerequisites, which include 1) v1.21 of the open source version of the ReportLab toolkit for PDF creation, and 2) xtopdf itself. The blog post linked above, has links to download xtopdf (and hence, XMLtoPDFBook). The same post (which also links to a previous post about XMLtoPDFBook), also shows how to use XMLtoPDFBook to generate simple PDF ebooks from the text content in XML files that are created in a specific format. The format is simple: the top-level element should be a book element, and the inner elements should be chapter elements. Chapter elements can have an optional attribute like this: chapter name=chapter_name Using this attribute will result in the specific chapter name being displayed in the header for the pages comprising that chapter (in the PDF output). Here is a guide to installing and using xtopdf: http://jugad2.blogspot.in/2012/07/guide-to-installing-and-using-xtopdf.html Enjoy, and give feedback, if any. - Vasudev Ram Dancing Bison Enterprises Python, Linux and open source training and consulting http://dancingbison.com http://jugad2.blogspot.com https://twitter.com/vasudevram -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANN] pypiserver 1.1.2 - minimal private pypi server
Hi, I've just uploaded pypiserver 1.1.2 to the python package index. pypiserver is a minimal PyPI compatible server. It can be used to serve a set of packages and eggs to easy_install or pip. pypiserver is easy to install (i.e. just 'pip install pypiserver'). It doesn't have any external dependencies. https://pypi.python.org/pypi/pypiserver/ should contain enough information to easily get you started running your own PyPI server in a few minutes. The code is available on github: https://github.com/schmir/pypiserver Changes in this version --- - fix pypi-server -U stable/unstable detection, i.e. do not accidentally update to unstable packages -- Cheers Ralf -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: Python development tools
On Monday, June 24, 2013 11:04:48 AM UTC+5:30, cutems93 wrote: Alright. Thanks everyone for your responses. I just want to know what tools are GENERALLY used by professional developers. I am helping somebody who wants to know about software that he might use in his project. He does not know what kind of project it will be, but it will be more like scripting in the beginning. I know my question is somewhat vague, but this is all I can give you. Could you help me by sharing your experiences? There was a thread on editors a few months ago where I made some suggestions: http://mail.python.org/pipermail/python-list/2013-January/639351.html and following I dont know what you mean my 'scripting' Anyhow I'll add this: the python docs are exceptionally well-written and a pleasure to go through. Start with http://docs.python.org/2/library/ Heres a suggested order to navigate 5 Subsects 1 to 9 are important 10 File and Directory subsects 1 2 7 3 27.1 sys 13 1 and 2 (csv and config) Some 3rd party config parsers better than builtin 15 1 os One of 15. 4 5 or 6 (command line parsing) Yes this is a bit of a mess 22 Internationalization (unicode) is increasingly important but I cannot make head-or-tail of it. Python 2 and 3 completely inconsistent in this area On general note about python's object orientation: If by 'scripting' you mean working within some large App's environment eg libreoffice or blender which are scripted with python, then you need to carefully understand that app's object model. If by scripting you mean something like shell-scripting and a few steps beyond, just forget about OO -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
rusi rustompm...@gmail.com writes: I dont know what you mean my 'scripting' Any time someone has shown me a “Python script”, I don't see how it's different from what I'd call a “Python program”. So I just mentally replace “scripting with “programming”. -- \ “Dvorak users of the world flgkd!” —Kirsten Chevalier, | `\rec.humor.oracle.d | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
On Mon, 24 Jun 2013 02:53:06 +0100, Rotwang wrote: On 23/06/2013 18:29, Steven D'Aprano wrote: On Sat, 22 Jun 2013 23:40:53 -0600, Ian Kelly wrote: [...] Can you elaborate or provide a link? I'm curious to know what other reason there could be for magic methods to behave differently from normal methods in this regard. It's an efficiency optimization. I don't quite get the details, but when you run something like a + b, Python doesn't search for __add__ using the normal method lookup procedure. That allows it to skip checking the instance __dict__, as well as __getattribute__ and __getattr__. It's not just an efficiency optimisation, it's actually necessary in cases where a dunder method gets called on a type. Consider what happens when one calls repr(int), for example - if this tried to call int.__repr__() by the normal lookup method, it would call the unbound __repr__ method of int with no self argument: I don't know about *necessary*, after all, classic classes manage just fine in Python 2.x: py class OldStyle: ... def __repr__(self): ... return Spam ... py repr(OldStyle()) 'Spam' py repr(OldStyle) 'class __main__.OldStyle at 0xb7553e0c' I daresay that there are good reasons why new-style classes don't do the same thing, but the point is that had the Python devs had been sufficiently interested in keeping the old behaviour, and willing to pay whatever costs that would require, they could have done so. But your point is well taken. It's not just purely a speed optimization. This is explained here: http://docs.python.org/3.3/reference/datamodel.html#special-lookup Nice link, thank you. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
On Monday, June 24, 2013 11:50:38 AM UTC+5:30, Ben Finney wrote: rusi writes: I dont know what you mean my 'scripting' Any time someone has shown me a “Python script”, I don't see how it's different from what I'd call a “Python program”. So I just mentally replace “scripting with “programming”. If you are saying that python spans the scripting to programming spectrum exceptionally well, I agree. I dont however think that the two philosophies are the same. See http://www.tcl.tk/doc/scripting.html -- http://mail.python.org/mailman/listinfo/python-list
Re: Making a pass form cgi = webpy framework
Στις 24/6/2013 7:37 πμ, ο/η Michael Torrie έγραψε:
Why use mako's approach which requires 2 files(an html template and the
actual python script rendering the data) when i can have simple print
statements inside 1 files(my files.py script) ?
After all its only one html table i wish to display.
Sooner or later your needs grow to the point where your single python
CGI file is mixing so much html and python code that it becomes unwieldy.
Yes Michale indeed, my pelatologio.py is filled with print html statemnt
and actual python code. it lloks like this:
#print all client profiles
print('''
body background=/data/images/bluetiles.jpg
centerh3font color=yellow size=5~ Πελατολόγιο ~br
font color=white size=5
Πελάτες: font color=red%s /font
Επισκευές: font color=silver %s /font
Χρήματα: font color=violet %s € /fontbrbr
table border=5 cellpadding=5 bgcolor=black
thfont color=lime size=5 Πελάτης /ththfont color=orange
size=5 Τηλέφωνο /th
thfont color=tomato size=5 Επισκευές /ththfont color=cyan
size=5 Σύνολο /th
''' % (clients, hits, money) )
for row in data:
(name, phone, hits, money) = row
print('''
tr
tdcentera
href=http://superhost.gr/cgi-bin/pelatologio.py/?log=%s; font
color=lime size=4 %s /a/td
tdcenterfont color=orange size=4 %s /td
tdcenterfont color=tomato size=4 %s /td
tdcenterfont color=cyan size=4 %s /td
/tr
''' % (name, name, phone, hits, money) )
===
Apart form the fact that i will need to separate the design form the
code, if i didn't is there an easiest way to print tables and forms by
using python's html generation functions and not plain print statements
that will make the code more clear?
And also in my pelatologio.py and other script i use if statements to
check if user submitted data or not so to print them on screen and then
exit, like modularization.
foe example:
if( log ):
name = log
print this and this
if( seek ):
other statements
print this and this
How will i be able to do this if i use an html template
every time an if() runs all the html will run and not a part of it.
Thanks.
--
What is now proved was at first only imagined!
--
http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
On Sun, 23 Jun 2013 21:38:33 -0400, Roy Smith wrote: In article 51c7a087$0$2$c3e8da3$54964...@news.astraweb.com, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: On Sun, 23 Jun 2013 15:24:14 -0400, Roy Smith wrote: In article 51c74373$0$2$c3e8da3$54964...@news.astraweb.com, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: What else would you call a function that does lookups on the current object's superclasses? Well, mro_lookup() would have been a better choice. Super() has an obvious meaning, which just happens to be wrong. This obvious but wrong meaning isn't the least bit obvious to me. Care to give me a hint? The only thing I can think of is: - if you are familiar with single inheritance; True. - but unfamiliar with multiple inheritance; False. Although, I'm pretty sure that all the times I've used MI (in both Python and C++), it was of the mix-in variety. Mixins are such a limited version of MI that it's often not even counted as MI, and even when it is, being familiar with mixins is hardly sufficient to count yourself as familiar with MI. That's kind of like me saying I'm familiar with life in Italy on the strength of a three-week holiday back in 1982 :-) If you still think of the superclass, then you haven't done enough MI to learn better :-) - then you might assume that super means return the superclass of this class (or possibly instance). That's exactly what I assumed. And, since you correctly surmised that that's what I would assume, I would suggest that it was pretty obvious to you too. Of course, given that assumption, it was not at all clear what it would do in a class with multiple ancestors. That's exactly why it *isn't* obvious. Too many assumptions need to be made, and questions left unanswered, for the conclusion to be obvious. Just because some people might jump to an unjustified conclusion, doesn't mean that the conclusion is obvious. That's like saying that it's obvious that the sun goes around the earth, because that's what it looks like. What would it look like if it was the other way around? I don't think that counts as obvious. Or at least not intuitive :-) Obvious is in the mind of the observer. Well that's obvious :-) -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Bubbles 0.1 – Virtual Data Object Framework
On 06/23/2013 07:58 PM, Stefan Urbanek wrote: If you have any comments, suggestions or questions, let me know. Hi Stefan, GH readme links to http://bubbles.databrewery.org/ but this page times out, can't connect to it. cheers, -- Dariusz Suchojad -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop Question
Here is my code...I'm using 2.7.5 username=raw_input(Please enter your username: ) password=raw_input(Please enter your password: ) if username == john doe and password == fopwpo: print Login Successful else: print Please try again -- http://mail.python.org/mailman/listinfo/python-list
Looking for a name for a deployment framework...
Hi all, Any suggestions for a good name, for a framework that does automatic server deployments? It's like Fabric, but more powerful. It has some similarities with Puppet, Chef and Saltstack, but is written in Python. Key points are that it uses Python, but is still very declarative and supports introspection. It supports parallel deployments, and interactivity. And it has a nice commandline shell with autocompletion for traversing the deployment tree. The repository: https://github.com/jonathanslenders/python-deployer/tree/refactoring-a-lot-v2 Suggestions welcome :) Jonathan -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
In article 51c7fe14$0$29973$c3e8da3$54964...@news.astraweb.com, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Mixins are such a limited version of MI that it's often not even counted as MI, and even when it is, being familiar with mixins is hardly sufficient to count yourself as familiar with MI. OK, fair enough. - then you might assume that super means return the superclass of this class (or possibly instance). That's exactly what I assumed. And, since you correctly surmised that that's what I would assume, I would suggest that it was pretty obvious to you too. Of course, given that assumption, it was not at all clear what it would do in a class with multiple ancestors. That's exactly why it *isn't* obvious. Too many assumptions need to be made, and questions left unanswered, for the conclusion to be obvious. I think we're using different definitions of obvious. I'm using it to mean, What you would conclude from a first look at a problem. The fact that it is proven to be wrong upon closer examination doesn't change the fact that it's obvious. That's like saying that it's obvious that the sun goes around the earth, because that's what it looks like. What would it look like if it was the other way around? Well, it is obvious. It's just wrong, based on our current understanding. Humans have been theorizing about how the heavenly bodies work for thousands of years. It's only in the past 400 that they're figured out how the solar system works. So, to bring this back to Python, the goal of designing easy-to-understand things is that the obvious explanation also happens to be the correct one. Giving super() the name that it has failed at this. -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a name for a deployment framework...
In article 8b0d8931-cf02-4df4-8f17-a47ddd279...@googlegroups.com, jonathan.slend...@gmail.com wrote: Hi all, Any suggestions for a good name, for a framework that does automatic server deployments? It's like Fabric, but more powerful. It has some similarities with Puppet, Chef and Saltstack, but is written in Python. Key points are that it uses Python, but is still very declarative and supports introspection. It supports parallel deployments, and interactivity. And it has a nice commandline shell with autocompletion for traversing the deployment tree. The repository: https://github.com/jonathanslenders/python-deployer/tree/refactoring-a-lot-v2 Suggestions welcome :) Jonathan Without forming any opinion on the software itself, the best advice I can offer is that naming puns are very popular. If you're thinking of this as a fabric replacement, I would go with cloth, textile, material, gabardine, etc. -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't feed the troll...
Op 23-06-13 16:29, ru...@yahoo.com schreef: On 06/21/2013 01:32 PM, Antoon Pardon wrote: Op 19-06-13 23:13, ru...@yahoo.com schreef: The troll is outside the volition of the group and so his appearance is effectively an act of nature. This seems a rather artificial division. Especially because the immediate cause that led to this discussion is Nikos. As the situation is now I see very little reason to exclude Nikos from the group. He has made a substantial number of contribution and has received a substantial number of replies. So on what grounds would you put Nikos outside the volition of this group? made contributions? I think you mean asked questions. He has not (as far as I tell) been a participant here in the past, has not tried to help or participated in any other threads, seems to be interested only in getting his own problems solved, and not shown many signs of concern with any form of group consensus(es), not responded to requests. Isn't all that in large part the basis of your objection to him? Outside the volition of this group seems like a reasonable description to me. What do you mean with not a participant in the past? As far as I can see his first appearance was in dec 2011. That is over a year ago. It also seems that he always find people willing to engage with him. Is how the group treats him not also an aspect in deciding whether he belongs or not? But if you want to classify Nikos as somehow incorrigible and hope for better from others, I can understand that. I just have a harder time understanding why you seem to make it some kind of priority that people in the group should still be able to communicate with this person with only a minimum of hassle. Possibly. But I don't consider utiltarism such a good measuring stick for these kind of situations. Too easy to neglect the concerns of individuals or small groups. And your alternative that doesn't neglect concerns of individuals or small groups would be what? Something that neglects the concerns of the majority? I would love to see a proposed solution that satisfies the concerns of every individual and group here. And of course since you maintain above that trolls themselves are legitimate members of the newsgroup, it should also satisfy their desires as well. But sadly, in the real world there are conflicting desires so I don't think your alternative exists. Are you trying to have a meaningful conversation or going for debating points? I didn't claim to have a solution that will satisfy everyone. But I do think there are better ways in handling this kind of situation other than one group of people by some kind of introspection coming to a conclusion of how best to deal with it, simply trying to argue others into compliance. Especially if this solution puts none of the burden on their own shoulders but all on others. So the question to answer is: how do those different policies affect the cost/benefits of the different groups and which one leads to the greatest good for the most? And I don't think that is the right question. It leads to people who are less annoyed by this kind of behaviour to ignore or brush of people who are more annoyed and attempts by the former to make the latter shoulder the full burden while not bearing any costs themselves and even behaving in such a way as to increase the annoyance of the latter group. Addressed in more detail below. No brushing off involved, only an attempt at the most reasonable tradeoff for everybody (which means not agreeing to the vigilantes desire to engage in flame wars with people that annoy them.) Yes, brushing off. Your attempt seems to consist solely on some kind of intropspection in which you came to some kind of conclusion and attempts to argue people into compliance. As far as I can see you didn't try to understand the view of others but just tried to convice them of the truth of your conclusion. That looks like brushing off to me. I have said something that can be interpretted as the first. But I made it clear because Nikos had allready receiced a ton of help like links of which he showed very little interest in actually reading. My boycot was meant for until he could show some results of him actively trying to solve his problems instead of us keeping to spoon feed him. What you see as a ton of help like links I submit did not seem that way to Nikos. Consider the help in one thread: | This is all you need to read: | http://docs.python.org/2/reference/expressions.html#boolean-operations Ignoring that the link is to Python2 while Nikos was using Python3 (and clearly did understand enough about the differences to assume it was still relevant), the contents start with In the context of Boolean operations... when Nikos' confusion (IIRC) was due to not understanding even the concept of a boolean context and the distinction between True/False and true/false (which is not even
Re: Looking for a name for a deployment framework...
On 24/06/2013 13:50, Roy Smith wrote: In article 8b0d8931-cf02-4df4-8f17-a47ddd279...@googlegroups.com, jonathan.slend...@gmail.com wrote: Hi all, Any suggestions for a good name, for a framework that does automatic server deployments? It's like Fabric, but more powerful. It has some similarities with Puppet, Chef and Saltstack, but is written in Python. Key points are that it uses Python, but is still very declarative and supports introspection. It supports parallel deployments, and interactivity. And it has a nice commandline shell with autocompletion for traversing the deployment tree. The repository: https://github.com/jonathanslenders/python-deployer/tree/refactoring-a-lot-v2 Suggestions welcome :) Jonathan Without forming any opinion on the software itself, the best advice I can offer is that naming puns are very popular. If you're thinking of this as a fabric replacement, I would go with cloth, textile, material, gabardine, etc. Snakeskin? Oh, I see that's already taken. :-( -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop Question
On Monday, June 24, 2013 5:42:51 PM UTC+5:30, christ...@gmail.com wrote: Here is my code...I'm using 2.7.5 username=raw_input(Please enter your username: ) password=raw_input(Please enter your password: ) if username == john doe and password == fopwpo: print Login Successful else: print Please try again Good! Now take Steven's suggestion loop with a break and bung your code into Steven's loop. [Hint: You have to add a break somewhere!] Or at least try! -- http://mail.python.org/mailman/listinfo/python-list
Re: Default Value
On 2013-06-22, Ian Kelly ian.g.ke...@gmail.com wrote: On Fri, Jun 21, 2013 at 7:15 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: On Fri, 21 Jun 2013 23:49:51 +0100, MRAB wrote: On 21/06/2013 21:44, Rick Johnson wrote: [...] Which in Python would be the MutableArgumentWarning. *school-bell* I notice that you've omitted any mention of how you'd know that the argument was mutable. That's easy. Just call ismutable(arg). The implementation of ismutable is just an implementation detail, somebody else can work that out. A language designer of the sheer genius of Rick can hardly be expected to worry himself about such trivial details. While we're at it, I would like to petition for a function terminates(f, args) that I can use to determine whether a function will terminate before I actually call it. I think it should be terminate_time() -- so you can also find out how long it's going to run. It can return None if it's not going to terminate... -- Grant Edwards grant.b.edwardsYow! I'm continually AMAZED at at th'breathtaking effects gmail.comof WIND EROSION!! -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Bubbles 0.1 – Virtual Data Object Framework
When the bubbles URL fails, Chrome suggests simply databrewery.org, which seems to work, though it has no mention of bubbles. Skip On Mon, Jun 24, 2013 at 3:54 AM, Dariusz Suchojad ds...@gefira.pl wrote: On 06/23/2013 07:58 PM, Stefan Urbanek wrote: If you have any comments, suggestions or questions, let me know. Hi Stefan, GH readme links to http://bubbles.databrewery.org/ but this page times out, can't connect to it. cheers, -- Dariusz Suchojad -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
On 2013-06-23, cutems93 ms2...@cornell.edu wrote: I am new to python development and I want to know what kinds of tools people use for python development. 1) emacs 2) Cpython 3) subversion 4) http://www.python.org/doc/ 5) comp.lang.python 99.9% of the programs I write are command-line tools. -- Grant Edwards grant.b.edwardsYow! I'm shaving!! at I'M SHAVING!! gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
On 24/06/2013 07:31, Steven D'Aprano wrote: On Mon, 24 Jun 2013 02:53:06 +0100, Rotwang wrote: On 23/06/2013 18:29, Steven D'Aprano wrote: On Sat, 22 Jun 2013 23:40:53 -0600, Ian Kelly wrote: [...] Can you elaborate or provide a link? I'm curious to know what other reason there could be for magic methods to behave differently from normal methods in this regard. It's an efficiency optimization. I don't quite get the details, but when you run something like a + b, Python doesn't search for __add__ using the normal method lookup procedure. That allows it to skip checking the instance __dict__, as well as __getattribute__ and __getattr__. It's not just an efficiency optimisation, it's actually necessary in cases where a dunder method gets called on a type. Consider what happens when one calls repr(int), for example - if this tried to call int.__repr__() by the normal lookup method, it would call the unbound __repr__ method of int with no self argument: I don't know about *necessary*, after all, classic classes manage just fine in Python 2.x: py class OldStyle: ... def __repr__(self): ... return Spam ... py repr(OldStyle()) 'Spam' py repr(OldStyle) 'class __main__.OldStyle at 0xb7553e0c' Point taken. It's also possible to override the __repr__ method of an old-style instance and have the change recognised by repr, so repr(x) isn't simply calling type(x).__repr__(x) in general. I daresay that there are good reasons why new-style classes don't do the same thing, but the point is that had the Python devs had been sufficiently interested in keeping the old behaviour, and willing to pay whatever costs that would require, they could have done so. Sure, though the above behaviour was probably easier to achieve with old-style classes than it would have been with new-style classes because all instances of old-style classes have the same type. But I don't doubt that you're correct that they could have done it if they wanted. -- http://mail.python.org/mailman/listinfo/python-list
Re: [SPAM] Re: Default Value
On 24/06/2013 15:22, Grant Edwards wrote: On 2013-06-22, Ian Kelly ian.g.ke...@gmail.com wrote: On Fri, Jun 21, 2013 at 7:15 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: On Fri, 21 Jun 2013 23:49:51 +0100, MRAB wrote: On 21/06/2013 21:44, Rick Johnson wrote: [...] Which in Python would be the MutableArgumentWarning. *school-bell* I notice that you've omitted any mention of how you'd know that the argument was mutable. That's easy. Just call ismutable(arg). The implementation of ismutable is just an implementation detail, somebody else can work that out. A language designer of the sheer genius of Rick can hardly be expected to worry himself about such trivial details. While we're at it, I would like to petition for a function terminates(f, args) that I can use to determine whether a function will terminate before I actually call it. I think it should be terminate_time() -- so you can also find out how long it's going to run. It can return None if it's not going to terminate... Surely that should be float(inf)! Anything else would be ridiculous! :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Making a pass form cgi = webpy framework
On Monday, June 24, 2013 1:02:51 PM UTC+5:30, Νίκος wrote: And also in my pelatologio.py and other script i use if statements to check if user submitted data or not so to print them on screen and then exit, like modularization. foe example: if( log ): name = log print this and this if( seek ): other statements print this and this How will i be able to do this if i use an html template every time an if() runs all the html will run and not a part of it. Every significant templating system has something for this eg in mako http://docs.makotemplates.org/en/latest/syntax.html#control-structures The main thing to understand is this: - When you use straight python, by default you are 'inside python' except when inside strings (inside prints) then you are 'inside html' - When using a templating engine, by default you are inside html, except when you escape from html into python -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
Mostly I'm saying that super() is badly named. What else would you call a function that does lookups on the current object's superclasses? ^. You make a symbol for it. ^__init__(foo, bar) -- MarkJ Tacoma, Washington -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
Also, I will use GUI interface for Python. What kind of widget toolkits do you recommend? I know there are GTK+ and Qt. wxPython, PyGUI... Sincerely, Wolfgang -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
On Mon, Jun 24, 2013 at 9:00 AM, Rotwang sg...@hotmail.co.uk wrote: On 24/06/2013 07:31, Steven D'Aprano wrote: I daresay that there are good reasons why new-style classes don't do the same thing, but the point is that had the Python devs had been sufficiently interested in keeping the old behaviour, and willing to pay whatever costs that would require, they could have done so. Sure, though the above behaviour was probably easier to achieve with old-style classes than it would have been with new-style classes because all instances of old-style classes have the same type. But I don't doubt that you're correct that they could have done it if they wanted. It seems to me that the important difference with new-style classes is that they suddenly have metaclasses and are themselves just ordinary objects, and so it is important that they consistently resolve calls in the same way that all other objects do. -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
On Mon, Jun 24, 2013 at 9:58 AM, Mark Janssen dreamingforw...@gmail.com wrote: Mostly I'm saying that super() is badly named. What else would you call a function that does lookups on the current object's superclasses? ^. You make a symbol for it. ^__init__(foo, bar) On the one hand, eww. On the other hand, with the changes to super in Python 3 to make it more magical, it might as well be syntax. -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a name for a deployment framework...
On 2013-06-24, MRAB pyt...@mrabarnett.plus.com wrote: On 24/06/2013 13:50, Roy Smith wrote: In article 8b0d8931-cf02-4df4-8f17-a47ddd279...@googlegroups.com, jonathan.slend...@gmail.com wrote: Hi all, Any suggestions for a good name, for a framework that does automatic server deployments? It's like Fabric, but more powerful. It has some similarities with Puppet, Chef and Saltstack, but is written in Python. Key points are that it uses Python, but is still very declarative and supports introspection. It supports parallel deployments, and interactivity. And it has a nice commandline shell with autocompletion for traversing the deployment tree. The repository: https://github.com/jonathanslenders/python-deployer/tree/refactoring-a-lot-v2 Suggestions welcome :) Jonathan Without forming any opinion on the software itself, the best advice I can offer is that naming puns are very popular. If you're thinking of this as a fabric replacement, I would go with cloth, textile, material, gabardine, etc. Snakeskin? Oh, I see that's already taken. :-( Most things are taken nowadays. A short nonsense-word is best. Something like Folaf. Yeah, it doesn't spark the imagination, but it's easy to find, if not to remember. Well, not Folaf. That seems to be an African style restaurant in L.A. -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a name for a deployment framework...
jonathan.slend...@gmail.com wrote: Any suggestions for a good name, for a framework that does automatic server deployments ? asdf : automatic server deployment framework -- Stanley C. Kitching Human Being Phoenix, Arizona -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop Question
On Sunday, June 23, 2013 6:18:35 PM UTC-5, christ...@gmail.com wrote: How do I bring users back to beginning of user/password question once they fail it? thx Can't seem to get this to cooperate...where does the while statement belong? -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop Question
In e41ce3a3-c8cb-4cfc-ba86-462f40f32...@googlegroups.com christheco...@gmail.com writes: On Sunday, June 23, 2013 6:18:35 PM UTC-5, christ...@gmail.com wrote: How do I bring users back to beginning of user/password question once they fail it? thx Can't seem to get this to cooperate...where does the while statement belong? while True: username = raw_input(Please enter your username: ) password = raw_input(Please enter your password: ) if username == john doe and password == fopwpo: print Login Successful break else: print Please try again -- John Gordon A is for Amy, who fell down the stairs gor...@panix.com B is for Basil, assaulted by bears -- Edward Gorey, The Gashlycrumb Tinies -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop Question
On Mon, Jun 24, 2013 at 8:42 PM, John Gordon gor...@panix.com wrote: In e41ce3a3-c8cb-4cfc-ba86-462f40f32...@googlegroups.com christheco...@gmail.com writes: On Sunday, June 23, 2013 6:18:35 PM UTC-5, christ...@gmail.com wrote: How do I bring users back to beginning of user/password question once they fail it? thx Can't seem to get this to cooperate...where does the while statement belong? while True: username = raw_input(Please enter your username: ) password = raw_input(Please enter your password: ) if username == john doe and password == fopwpo: print Login Successful break else: print Please try again You didn’t test the code, did you? Because the code you posted is right. Remember to always test code before submitting. And note that the getpass module is what you should use for that second thing in real life, for the security of your users. -- Kwpolska http://kwpolska.tk | GPG KEY: 5EAAEA16 stop html mail| always bottom-post http://asciiribbon.org| http://caliburn.nl/topposting.html -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a name for a deployment framework...
On 24-6-2013 20:13, Cousin Stanley wrote: jonathan.slend...@gmail.com wrote: Any suggestions for a good name, for a framework that does automatic server deployments ? asdf : automatic server deployment framework :-) wsad: wonderful serverside automatic deployments (hm, could use a bit of tweaking, maybe FPS keys don't map easily to names) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop Question
In mailman.3754.1372100014.3114.python-l...@python.org =?UTF-8?B?Q2hyaXMg4oCcS3dwb2xza2HigJ0gV2Fycmljaw==?= kwpol...@gmail.com writes: while True: username = raw_input(Please enter your username: ) password = raw_input(Please enter your password: ) if username == john doe and password == fopwpo: print Login Successful break else: print Please try again You didn't test the code, did you? Because the code you posted is right. It's right, therefore I did not test it? I don't understand. If the code has a bug, please point it out. And note that the getpass module is what you should use for that second thing in real life, for the security of your users. I'm sure this is just an exercise for the OP to understand loops. Security would be counter-productive. -- John Gordon A is for Amy, who fell down the stairs gor...@panix.com B is for Basil, assaulted by bears -- Edward Gorey, The Gashlycrumb Tinies -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a name for a deployment framework...
On 24 Jun 2013 13:39, jonathan.slend...@gmail.com wrote: Hi all, Any suggestions for a good name, for a framework that does automatic server deployments? It's like Fabric, but more powerful. It has some similarities with Puppet, Chef and Saltstack, but is written in Python. Key points are that it uses Python, but is still very declarative and supports introspection. It supports parallel deployments, and interactivity. And it has a nice commandline shell with autocompletion for traversing the deployment tree. The repository: https://github.com/jonathanslenders/python-deployer/tree/refactoring-a-lot-v2 Suggestions welcome :) Jonathan omglolftwdeploy -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop Question
On 06/24/2013 03:00 PM, John Gordon wrote: In mailman.3754.1372100014.3114.python-l...@python.org =?UTF-8?B?Q2hyaXMg4oCcS3dwb2xza2HigJ0gV2Fycmljaw==?= kwpol...@gmail.com writes: while True: username = raw_input(Please enter your username: ) password = raw_input(Please enter your password: ) if username == john doe and password == fopwpo: print Login Successful break else: print Please try again You didn't test the code, did you? Because the code you posted is right. It's right, therefore I did not test it? I don't understand. I expect that Chris simply misinterpreted the quoting in your message, thinking that the OP had both typed the Can't seem to get this to cooperate...where does t... and the correct code. In fact, the OP typed the former, and you typed the latter. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
Hi there! I'm quite new to programming, even newer in python (this is actually the first thing I try on it), and every other topic I've seen on forums about my problem doesn't seem to help. So, the following lines are intended to draw a white square (which it does), turn it to blue when you click on it, and back to white when you click on it again (and so on). Here's what I wrote (python 3 syntax): from tkinter import * root = Tk() root.geometry(500x500) w = Canvas(root, width=500, height=500) w.pack() coords = (x1, y1, x2, y2) = (100, 100, 200, 200) rect = w.create_rectangle(coords, fill=white) isWhite = True def change(event): if event.x x1 and event.x x2 and event.y y1 and event.y y2: if isWhite: w.itemconfig(rect, fill=blue) isWhite = False else: w.itemconfig(rect, fill=white) isWhite = True w.bind(Button-1, change) root.mainloop() The problem occurs when clicking on the white square. The following error appears: if isWhite: UnboundLocalError: local variable 'isWhite' referenced before assignment However, the isWhite variable is clearly defined at True a few lines before. Also, if I remove the lines that change isWhite to False if it's True and viceversa, the program doesn't throw any error, but obviously doesn't do what I want it to do (it only changes the square color once, as isWhite stays set to True). What can the problem be? I'm sure it's something really simple, but I don't get it... Thank's! -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
Just before anyone says, the reason I bind to the Canvas instead of binding directly to the rectangle is because I plan to add more squares in the future. Cheers. -- http://mail.python.org/mailman/listinfo/python-list
Is this PEP-able? fwhile
Syntax: fwhile X in ListY and conditionZ: The following would actually exactly as: for X in ListY: fwhile X in ListY and True: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. The motivation is to be able to make use of all the great aspects of the python 'for' (no indexing or explict end condition check, etc.) and at the same time avoiding a 'break' from the 'for'. (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs, so they instead convert the clean 'for' into a less-clean 'while'. Or they just let the 'for' run out. You can argue against this teaching (at least for Python) but that doesn't mean it's not prevalent and prevailing.) [People who avoid the 'break' by functionalizing an inner portion of the loop are just kidding themselves and making their own code worse, IMO.] I'm not super familiar with CPython, but I'm pretty sure I could get this up and working without too much effort. The mandatory 'and' makes sense because 'or' would hold the end value valid (weird) and not accomplish much. The condition itself could of course have multiple parts to it, including 'or's. It's possible the name 'fwhile' is not optimal, but that shouldn't affect the overall merit/non-merit of the concept. Comments and Questions welcome. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
pablobarhamal...@gmail.com wrote: Hi there! I'm quite new to programming, even newer in python (this is actually the first thing I try on it), and every other topic I've seen on forums about my problem doesn't seem to help. So, the following lines are intended to draw a white square (which it does), turn it to blue when you click on it, and back to white when you click on it again (and so on). Here's what I wrote (python 3 syntax): from tkinter import * root = Tk() root.geometry(500x500) w = Canvas(root, width=500, height=500) w.pack() coords = (x1, y1, x2, y2) = (100, 100, 200, 200) rect = w.create_rectangle(coords, fill=white) isWhite = True def change(event): if event.x x1 and event.x x2 and event.y y1 and event.y y2: if isWhite: w.itemconfig(rect, fill=blue) isWhite = False else: w.itemconfig(rect, fill=white) isWhite = True w.bind(Button-1, change) root.mainloop() The problem occurs when clicking on the white square. The following error appears: if isWhite: UnboundLocalError: local variable 'isWhite' referenced before assignment However, the isWhite variable is clearly defined at True a few lines before. Also, if I remove the lines that change isWhite to False if it's True and viceversa, the program doesn't throw any error, but obviously doesn't do what I want it to do (it only changes the square color once, as isWhite stays set to True). What can the problem be? I'm sure it's something really simple, but I don't get it... Thank's! Python statically determines the scope of a variable -- if you rebind a name it assumes that the variable is local: def f(): ... print is_white ... is_white = 42 ... f() Traceback (most recent call last): File stdin, line 1, in module File stdin, line 2, in f UnboundLocalError: local variable 'is_white' referenced before assignment The fix is to tell Python that you want to access the global variable: def f(): ... global is_white ... print is_white ... is_white = 42 ... is_white = whatever f() whatever f() 42 -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
Op 24-06-13 21:47, pablobarhamal...@gmail.com schreef: Hi there! I'm quite new to programming, even newer in python (this is actually the first thing I try on it), and every other topic I've seen on forums about my problem doesn't seem to help. So, the following lines are intended to draw a white square (which it does), turn it to blue when you click on it, and back to white when you click on it again (and so on). Here's what I wrote (python 3 syntax): from tkinter import * root = Tk() root.geometry(500x500) w = Canvas(root, width=500, height=500) w.pack() coords = (x1, y1, x2, y2) = (100, 100, 200, 200) rect = w.create_rectangle(coords, fill=white) isWhite = True def change(event): if event.x x1 and event.x x2 and event.y y1 and event.y y2: if isWhite: w.itemconfig(rect, fill=blue) isWhite = False else: w.itemconfig(rect, fill=white) isWhite = True w.bind(Button-1, change) root.mainloop() The problem occurs when clicking on the white square. The following error appears: if isWhite: UnboundLocalError: local variable 'isWhite' referenced before assignment However, the isWhite variable is clearly defined at True a few lines before. No it is not. In Python, when you assign to a variable within a function, that variable will be treated as a local variable. If you have a global variable with the same name, that global variable will just for the duration of the function become inaccessible. The quick solution in this case is to include a global statement. Something like def change(event) global isWhite ... -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 1:52 PM, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: The following would actually exactly as: for X in ListY: fwhile X in ListY and True: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. The motivation is to be able to make use of all the great aspects of the python 'for' (no indexing or explict end condition check, etc.) and at the same time avoiding a 'break' from the 'for'. I would advocate using the break myself. Another alternative is this: for X in itertools.takewhile(lambda X: conditionZ, ListY): ... -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
In b3d3518a-f24a-4c32-a41a-b99145753...@googlegroups.com pablobarhamal...@gmail.com writes: isWhite = True def change(event): if event.x x1 and event.x x2 and event.y y1 and event.y y2: if isWhite: w.itemconfig(rect, fill=blue) isWhite = False else: w.itemconfig(rect, fill=white) isWhite = True w.bind(Button-1, change) root.mainloop() The problem occurs when clicking on the white square. The following error appears: if isWhite: UnboundLocalError: local variable 'isWhite' referenced before assignment However, the isWhite variable is clearly defined at True a few lines before. Since you're new to programming, this might be a bit tricky to explain, but I'll do my best. :-) The problem is that change() isn't being executed here; instead it's being executed from within root.mainloop(), whenever the user presses button-1. And within root.mainloop(), there is no variable called isWhite. -- John Gordon A is for Amy, who fell down the stairs gor...@panix.com B is for Basil, assaulted by bears -- Edward Gorey, The Gashlycrumb Tinies -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
Thank's to you all! Setting isWhite as global worked fine. I'll probably be back soon with another silly question, see you then :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 1:52 PM, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: Also, this syntax is ambiguous. Take for example the statement: fwhile X in ListA and ListB and ListC and ListD: At which and does the iterable expression stop and the condition expression begin? -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
Here's a little test to make sure you understand (this is one of the most confusing parts of Python's closures in my opinion): foo = I'm foo! def working(): print(foo) def broken(): print(foo) if False: # There's no way this could cause a problem! foo = This will *never* happen -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
On 24 June 2013 21:12, John Gordon gor...@panix.com wrote: Since you're new to programming, this might be a bit tricky to explain, but I'll do my best. :-) The problem is that change() isn't being executed here; instead it's being executed from within root.mainloop(), whenever the user presses button-1. And within root.mainloop(), there is no variable called isWhite. Sorry, but I don't think you're right. Functions carry their contexts around with them, so that shouldn't matter (See Peter and Antoon's comments for explanation of what I think it is) -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 8:52 PM, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: The following would actually exactly as: for X in ListY: fwhile X in ListY and True: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. The motivation is to be able to make use of all the great aspects of the python 'for' (no indexing or explict end condition check, etc.) and at the same time avoiding a 'break' from the 'for'. (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs, so they instead convert the clean 'for' into a less-clean 'while'. Or they just let the 'for' run out. You can argue against this teaching (at least for Python) but that doesn't mean it's not prevalent and prevailing.) [People who avoid the 'break' by functionalizing an inner portion of the loop are just kidding themselves and making their own code worse, IMO.] I'm not super familiar with CPython, but I'm pretty sure I could get this up and working without too much effort. The mandatory 'and' makes sense because 'or' would hold the end value valid (weird) and not accomplish much. The condition itself could of course have multiple parts to it, including 'or's. It's possible the name 'fwhile' is not optimal, but that shouldn't affect the overall merit/non-merit of the concept. Comments and Questions welcome. Thanks. I can see where you are coming from, but this is probably not going to happen. The and keyword is also Also, the (amazing) python devs are concerned with overcomplicating the language syntax, which is bad for: newbies, other implementations of the language, and code readability. The syntax doesn't seem too obvious, and there is a new keyword, fwhile. This can probably be best achieved by adding to the existing for loop, so maybe taking advantage of the existing for...if syntax and adding for...while would be a better idea? So, maybe: for x in y while cond: And for list/set/dict comprehensions and generator expressions: [x for x in range(123) while cond] Just maybe. -- Fábio Santos -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 24 June 2013 20:52, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: The following would actually exactly as: for X in ListY: fwhile X in ListY and True: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. The motivation is to be able to make use of all the great aspects of the python 'for' (no indexing or explict end condition check, etc.) and at the same time avoiding a 'break' from the 'for'. There is one good reason not to use breaks: itertools. I often prefer a for-over-a-properly-constrained-iterable to a for-with-a-break, but there's no real reason to ever prefer a while. That said, why add this to the syntax when there's already functionality that gives you what you want? Just use itertools.takewhile as Ian Kelly says. (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs, so they instead convert the clean 'for' into a less-clean 'while'. Or they just let the 'for' run out. You can argue against this teaching (at least for Python) but that doesn't mean it's not prevalent and prevailing.) We shouldn't make a language around people are taught the language badly - let us accommodate for their bad practices! [People who avoid the 'break' by functionalizing an inner portion of the loop are just kidding themselves and making their own code worse, IMO.] I'm not super familiar with CPython, but I'm pretty sure I could get this up and working without too much effort. The mandatory 'and' makes sense because 'or' would hold the end value valid (weird) and not accomplish much. The condition itself could of course have multiple parts to it, including 'or's. It's possible the name 'fwhile' is not optimal, but that shouldn't affect the overall merit/non-merit of the concept. Possible? It's more than just possible, *wink*. Comments and Questions welcome. -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
On 24 June 2013 21:19, pablobarhamal...@gmail.com wrote: Thank's to you all! Setting isWhite as global worked fine. I'll probably be back soon with another silly question, see you then :) By the way, it's normally bad to use globals like this. When you're learning it's something you just do, though; it's fine for now. -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
On 06/24/2013 04:12 PM, John Gordon wrote: In b3d3518a-f24a-4c32-a41a-b99145753...@googlegroups.com pablobarhamal...@gmail.com writes: isWhite = True def change(event): if event.x x1 and event.x x2 and event.y y1 and event.y y2: if isWhite: w.itemconfig(rect, fill=blue) isWhite = False else: w.itemconfig(rect, fill=white) isWhite = True w.bind(Button-1, change) root.mainloop() The problem occurs when clicking on the white square. The following error appears: if isWhite: UnboundLocalError: local variable 'isWhite' referenced before assignment However, the isWhite variable is clearly defined at True a few lines before. Since you're new to programming, this might be a bit tricky to explain, but I'll do my best. :-) The problem is that change() isn't being executed here; instead it's being executed from within root.mainloop(), whenever the user presses button-1. And within root.mainloop(), there is no variable called isWhite. Actually that's irrelevant. Whether or not there's one global with the same name, or twenty-three object attributes with the same name, the fact that there's a binding of the local makes that name a local. The only way to avoid that is not to bind, or to use global or nonlocal declarations. Pablo: Global variables are generally frowned upon, unless they're constant. If they're constant, use ALLCAPS to indicate that. Since this is not, it would normally be an attribute of some object, in your case, possibly the object w. And of course, w should have been an argument to the function as well, since you're operating on it. But you may be stuck with that, because of tkinter's design. Anyway, you can assign w.isWhite = True and access if w.isWhite with impunity, since w is not being bound inside the function. When you need to pass extra arguments that the event model doesn't allow for, one approach is to use functools.partial(). And it's also possible that there's a method (in tkinter) on event that let's you find the object that it's acting upon, w. In this case, you could avoid needing a global at all, which would be a big improvement. Especially when you decide to have multiple such boxes, and want each to be able to toggle colors independently. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
I find itertools clumsy and wordy. You shouldn't have to have a lambda expression just to break out of a for! I agree to not cater to bad practices, but if a clean improvement is possible it will practically help code overall, even if theoretically people shouldn't be adopting a practice (don't use breaks) to the wrong circumstance (the python 'for' is not like other fors in other languages). -Jim -Original Message- From: Joshua Landau joshua.landau...@gmail.com To: jimjhb jim...@aol.com Cc: python-list python-list@python.org Sent: Mon, Jun 24, 2013 4:41 pm Subject: Re: Is this PEP-able? fwhile On 24 June 2013 20:52, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: The following would actually exactly as: for X in ListY: fwhile X in ListY and True: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. The motivation is to be able to make use of all the great aspects of the python 'for' (no indexing or explict end condition check, etc.) and at the same time avoiding a 'break' from the 'for'. There is one good reason not to use breaks: itertools. I often prefer a for-over-a-properly-constrained-iterable to a for-with-a-break, but there's no real reason to ever prefer a while. That said, why add this to the syntax when there's already functionality that gives you what you want? Just use itertools.takewhile as Ian Kelly says. (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs, so they instead convert the clean 'for' into a less-clean 'while'. Or they just let the 'for' run out. You can argue against this teaching (at least for Python) but that doesn't mean it's not prevalent and prevailing.) We shouldn't make a language around people are taught the language badly - let us accommodate for their bad practices! [People who avoid the 'break' by functionalizing an inner portion of the loop are just kidding themselves and making their own code worse, IMO.] I'm not super familiar with CPython, but I'm pretty sure I could get this up and working without too much effort. The mandatory 'and' makes sense because 'or' would hold the end value valid (weird) and not accomplish much. The condition itself could of course have multiple parts to it, including 'or's. It's possible the name 'fwhile' is not optimal, but that shouldn't affect the overall merit/non-merit of the concept. Possible? It's more than just possible, *wink*. Comments and Questions welcome. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
Your syntax makes great sense. Avoiding new keywords is obviously preferable. -Original Message- From: Fábio Santos fabiosantos...@gmail.com To: jimjhb jim...@aol.com Cc: python-list python-list@python.org Sent: Mon, Jun 24, 2013 4:34 pm Subject: Re: Is this PEP-able? fwhile On Mon, Jun 24, 2013 at 8:52 PM, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: The following would actually exactly as: for X in ListY: fwhile X in ListY and True: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. The motivation is to be able to make use of all the great aspects of the python 'for' (no indexing or explict end condition check, etc.) and at the same time avoiding a 'break' from the 'for'. (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs, so they instead convert the clean 'for' into a less-clean 'while'. Or they just let the 'for' run out. You can argue against this teaching (at least for Python) but that doesn't mean it's not prevalent and prevailing.) [People who avoid the 'break' by functionalizing an inner portion of the loop are just kidding themselves and making their own code worse, IMO.] I'm not super familiar with CPython, but I'm pretty sure I could get this up and working without too much effort. The mandatory 'and' makes sense because 'or' would hold the end value valid (weird) and not accomplish much. The condition itself could of course have multiple parts to it, including 'or's. It's possible the name 'fwhile' is not optimal, but that shouldn't affect the overall merit/non-merit of the concept. Comments and Questions welcome. Thanks. I can see where you are coming from, but this is probably not going to happen. The and keyword is also Also, the (amazing) python devs are concerned with overcomplicating the language syntax, which is bad for: newbies, other implementations of the language, and code readability. The syntax doesn't seem too obvious, and there is a new keyword, fwhile. This can probably be best achieved by adding to the existing for loop, so maybe taking advantage of the existing for...if syntax and adding for...while would be a better idea? So, maybe: for x in y while cond: And for list/set/dict comprehensions and generator expressions: [x for x in range(123) while cond] Just maybe. -- Fábio Santos -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 3:01 PM, Ian Kelly ian.g.ke...@gmail.com wrote: On Mon, Jun 24, 2013 at 2:34 PM, Fábio Santos fabiosantos...@gmail.com wrote: This can probably be best achieved by adding to the existing for loop, so maybe taking advantage of the existing for...if syntax and adding for...while would be a better idea? The for...if syntax only exists for comprehensions and generators. If we're going to add for...while for loops, then we might as well go ahead and add for...if loops there as well. Which of course brings us to the for...if...while loop. Or should it be for...while...if? Or do we allow both, and if so, are the semantics the same or different? -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 2:34 PM, Fábio Santos fabiosantos...@gmail.com wrote: This can probably be best achieved by adding to the existing for loop, so maybe taking advantage of the existing for...if syntax and adding for...while would be a better idea? The for...if syntax only exists for comprehensions and generators. If we're going to add for...while for loops, then we might as well go ahead and add for...if loops there as well. That said, I do like this syntax better than fwhile. -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a name for a deployment framework...
Thanks everyone, I'll think about it. The main reason is that I'm working on the documentation, and this a a good opportunity to think about the naming. python-deploy-framework or python-deployer could be too boring. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
On 24Jun2013 14:28, Grant Edwards invalid@invalid.invalid wrote: | On 2013-06-23, cutems93 ms2...@cornell.edu wrote: | I am new to python development and I want to know what kinds of tools | people use for python development. | | 1) emacs | 2) Cpython | 3) subversion | 4) http://www.python.org/doc/ | 5) comp.lang.python 1) vi/vim 2) Cpython 3) mercurial 4) local copy of http://www.python.org/doc/ for python 2 and 3 (lets me work offline and snappier to browse) 5) python-list@python.org | 99.9% of the programs I write are command-line tools. 99.9% of the programs I write are command-line tools. Cheers, -- Cameron Simpson c...@zip.com.au The simple truth is that interstellar distances will not fit into the human imagination. - Douglas Adams -- http://mail.python.org/mailman/listinfo/python-list
(newbye) exceptions list for python3 classes
Hi, what is the best way to find out all exceptions for a class? E.g. I want to find out all exceptions related to the zipfile (I'm searching for the Bad password exception syntax). thanks for your help or feedback, Christophe -- http://mail.python.org/mailman/listinfo/python-list
Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
In mailman.3767.1372106609.3114.python-l...@python.org Dave Angel da...@davea.name writes: The problem is that change() isn't being executed here; instead it's being executed from within root.mainloop(), whenever the user presses button-1. And within root.mainloop(), there is no variable called isWhite. Actually that's irrelevant. Whether or not there's one global with the same name, or twenty-three object attributes with the same name, the fact that there's a binding of the local makes that name a local. The only way to avoid that is not to bind, or to use global or nonlocal declarations. Quite right. I should have verified my answer before posting. Thanks for setting me straight. :-) -- John Gordon A is for Amy, who fell down the stairs gor...@panix.com B is for Basil, assaulted by bears -- Edward Gorey, The Gashlycrumb Tinies -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Tue, Jun 25, 2013 at 5:52 AM, jim...@aol.com wrote: (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs... Why? Why on earth should break/continue be avoided? I think that's the solution: teach people that loops are there to be interrupted and manipulated. And then it's a small step to jumping into the middle of a loop, and from there to Duff's Device... hmm, I'm not sure that strengthens my case, really. But anyway. Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: (newbye) exceptions list for python3 classes
Le 24/06/13 23:35, chrem a écrit :
Hi,
what is the best way to find out all exceptions for a class?
E.g. I want to find out all exceptions related to the zipfile (I'm
searching for the Bad password exception syntax).
thanks for your help or feedback,
Christophe
without exception, it shown:
RuntimeError: ('Bad password for file', zipfile.ZipInfo object at
0x100756690)
then I tried:
except zipfile.BadPassword:
print(Password does not match)
but it returned:
AttributeError: 'module' object has no attribute 'BadPassword'
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Tue, Jun 25, 2013 at 8:30 AM, Tim Chase python.l...@tim.thechases.com wrote: On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level True. There are times I do wish for a 'goto'. But if goto were implemented, I would also use it for jumping _into_ loops, and I'm not sure that's going to make the feature popular :) ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 4:41 PM, Fábio Santos fabiosantos...@gmail.com wrote: On 24 Jun 2013 22:29, Ian Kelly ian.g.ke...@gmail.com wrote: On Mon, Jun 24, 2013 at 2:34 PM, Fábio Santos fabiosantos...@gmail.com wrote: This can probably be best achieved by adding to the existing for loop, so maybe taking advantage of the existing for...if syntax and adding for...while would be a better idea? The for...if syntax only exists for comprehensions and generators. If we're going to add for...while for loops, then we might as well go ahead and add for...if loops there as well. That said, I do like this syntax better than fwhile. Good point. Still, I don't see why for..if doesn't exist in for loops anyway. It may be lack of foresight, but I don't understand why at all. Because it adds more syntax to learn when learning the language, it introduces more maintenance overhead, and it offers no clear benefit over simply nesting an if inside a for. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 24 Jun 2013 23:35, Tim Chase python.l...@tim.thechases.com wrote: On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level -tkc for x, y in itertools.product(range(width), range(height)): -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 24 Jun 2013 22:29, Ian Kelly ian.g.ke...@gmail.com wrote: On Mon, Jun 24, 2013 at 2:34 PM, Fábio Santos fabiosantos...@gmail.com wrote: This can probably be best achieved by adding to the existing for loop, so maybe taking advantage of the existing for...if syntax and adding for...while would be a better idea? The for...if syntax only exists for comprehensions and generators. If we're going to add for...while for loops, then we might as well go ahead and add for...if loops there as well. That said, I do like this syntax better than fwhile. Good point. Still, I don't see why for..if doesn't exist in for loops anyway. It may be lack of foresight, but I don't understand why at all. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 4:35 PM, Chris Angelico ros...@gmail.com wrote: On Tue, Jun 25, 2013 at 8:30 AM, Tim Chase python.l...@tim.thechases.com wrote: On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level True. There are times I do wish for a 'goto'. But if goto were implemented, I would also use it for jumping _into_ loops, and I'm not sure that's going to make the feature popular :) You can have labeled break and continue without going all the way to a goto statement. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 24/06/2013 23:35, Chris Angelico wrote: On Tue, Jun 25, 2013 at 8:30 AM, Tim Chase python.l...@tim.thechases.com wrote: On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level True. There are times I do wish for a 'goto'. But if goto were implemented, I would also use it for jumping _into_ loops, and I'm not sure that's going to make the feature popular :) I think a better way would be to label the outer loop somehow and then break out of it by name. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 25 Jun 2013 00:04, MRAB pyt...@mrabarnett.plus.com wrote: On 24/06/2013 23:35, Chris Angelico wrote: On Tue, Jun 25, 2013 at 8:30 AM, Tim Chase python.l...@tim.thechases.com wrote: On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level True. There are times I do wish for a 'goto'. But if goto were implemented, I would also use it for jumping _into_ loops, and I'm not sure that's going to make the feature popular :) I think a better way would be to label the outer loop somehow and then break out of it by name. I like how discussions on this list tend to go off topic ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 24/06/2013 23:30, Tim Chase wrote: On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level -tkc Doesn't the goto module http://entrian.com/goto/ fix this? :) -- Steve is going for the pink ball - and for those of you who are watching in black and white, the pink is next to the green. Snooker commentator 'Whispering' Ted Lowe. Mark Lawrence -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 2013-06-24 23:39, Fábio Santos wrote: On 24 Jun 2013 23:35, Tim Chase wrote: On 2013-06-25 07:38, Chris Angelico wrote: Python has no issues with breaking out of loops, and even has syntax specifically to complement it (the 'else:' clause). Use break/continue when appropriate. from minor_gripes import breaking_out_of_nested_loops_to_top_level for x, y in itertools.product(range(width), range(height)): This works nicely for certain use cases, but if there's additional processing that needs to be done in the outer loops, it starts to get hairy. As Ian Kelly mentions, I could really dig a labeled break/continue in Python (it's one of the few ideas I like that Java made pretty popular; though I can't say I particularly care for Java's implementation). I'd love to see something like a decorator where you could do things like the following pseudocode: @toplevel for i in range(height): for j in range(width): for component in data[i,j]: if condition: continue toplevel elif other_condition: break toplevel else: other processing I'm not sure such a feature would ever arrive, but it would make it easier than the current recommendation which is usually to either (1) make inner loops into functions from which you can return; or (2) raise a custom exception and then catch it in the outer loop. -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Tue, Jun 25, 2013 at 8:43 AM, Ian Kelly ian.g.ke...@gmail.com wrote:
On Mon, Jun 24, 2013 at 4:41 PM, Fábio Santos fabiosantos...@gmail.com
wrote:
On 24 Jun 2013 22:29, Ian Kelly ian.g.ke...@gmail.com wrote:
On Mon, Jun 24, 2013 at 2:34 PM, Fábio Santos fabiosantos...@gmail.com
wrote:
This can probably be best achieved by adding to the existing for loop,
so maybe taking advantage of the existing for...if syntax and adding
for...while would be a better idea?
The for...if syntax only exists for comprehensions and generators. If
we're going to add for...while for loops, then we might as well go
ahead and add for...if loops there as well.
That said, I do like this syntax better than fwhile.
Good point. Still, I don't see why for..if doesn't exist in for loops
anyway. It may be lack of foresight, but I don't understand why at all.
Because it adds more syntax to learn when learning the language, it
introduces more maintenance overhead, and it offers no clear benefit
over simply nesting an if inside a for.
In more free-form languages, I implement this by simply omitting a line-break:
for (int i=0;inum_whatevers;++i) if (whatever[i].flag)
{
do_stuff;
}
Python could afford to lose a little rigidity here rather than gain
actual new syntax:
for i in range(10): if i%3:
print(i)
And there you are, the for-if filtered iteration model, just by
relaxing one rule.
ChrisA
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 25 Jun 2013 00:06, Fábio Santos fabiosantos...@gmail.com wrote: I like how discussions on this list tend to go off topic ;) And now I'm off topic myself :( -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
rusi rustompm...@gmail.com writes: On Monday, June 24, 2013 11:50:38 AM UTC+5:30, Ben Finney wrote: Any time someone has shown me a “Python script”, I don't see how it's different from what I'd call a “Python program”. So I just mentally replace “scripting with “programming”. If you are saying that python spans the scripting to programming spectrum exceptionally well, I agree. I'm saying that “scripting” is a complete subset of “programming”, so it's nonsense to talk about “the scripting-to-programming spectrum”. Scripting is, always, programming. Scripts are, always, programs. (But not vice-versa; I do acknowledge there is more to programming than scripting.) I say this because anything anyone has said to me about the former is always something included already by the latter. So I don't see much need for treating scripts as somehow distinct from programs, or scripting as somehow distinct from programming. Whenever you're doing the former, you're doing the latter by definition. I dont however think that the two philosophies are the same. See http://www.tcl.tk/doc/scripting.html That essay constrasts “scripting” versus “system programming”, a useful (though terminologically confusing) distinction. It's a mistake to think that essay contrasts “scripting“ versus “programming”. But the essay never justifies its aversion to “programming” as a term for what it's describing, so that mistake is easy to make. -- \ “A celebrity is one who is known by many people he is glad he | `\ doesn't know.” —Henry L. Mencken | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: (newbye) exceptions list for python3 classes
On 25/06/2013 7:43 AM, chrem wrote:
Le 24/06/13 23:35, chrem a écrit :
what is the best way to find out all exceptions for a class?
E.g. I want to find out all exceptions related to the zipfile (I'm
searching for the Bad password exception syntax).
The only way is to look at the source code for the class and look for
raise statements. However, not this will not show exceptions that may be
raised by other objects it wraps or utilises, like file IO exceptions.
without exception, it shown:
RuntimeError: ('Bad password for file', zipfile.ZipInfo object at
0x100756690)
then I tried:
except zipfile.BadPassword:
print(Password does not match)
but it returned:
AttributeError: 'module' object has no attribute 'BadPassword'
The exception is prefixed to the message, try catching RuntimeError instead:
except RuntimeError as e:
if 'Bad password' in e.message:
print('Password does not match')
else:
raise e
In this example, I've re-raised the exception if it isn't a bad password
problem, as it's not handled by my code. This is considered good
practice: deal with the exceptions you can, ignore or re-raise the ones
you can't.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 25/06/2013 6:12 AM, Ian Kelly wrote: On Mon, Jun 24, 2013 at 1:52 PM, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. I would advocate using the break myself. Another alternative is this: for X in itertools.takewhile(lambda X: conditionZ, ListY): ... I'd probably just go with a generator expression to feed the for loop: for X in (i for i in ListY if conditionZ): -- http://mail.python.org/mailman/listinfo/python-list
Re: (newbye) exceptions list for python3 classes
chrem usenetnos...@chr1st0ph9.eu writes: Hi, Howdy, congratulations on finding the Python programming language. what is the best way to find out all exceptions for a class? Python is not Java. Your program doesn't need to know everything that might happen; you should catch only those exceptions you can actually deal with usefully, and let any others propagate. E.g. I want to find out all exceptions related to the zipfile (I'm searching for the Bad password exception syntax). The documentation will describe the behaviour of the module; many exceptions are implied by that (e.g. if the module deals with the filesystem, you can expect OSError to be raised under certain conditions). Other exceptions will come from deeper within Python; e.g. if you give text in a bad encoding you can expect UnicodeDecodeError, or if you give it an object that can't be handled as expected you might get a TypeError. But trying to get a complete set of all exceptions that might be raised is a fool's errand. It would be futile, both because everything in Python is an object and can therefore raise whatever exceptions are appropriate, and also because even if you knew a complete set, you can't usefully do anything consistent with such a huge set of exception types. So, what is it you want to do one you know a set of exception types that can be raised by the code? thanks for your help or feedback, Hope that helps, and good fortune to you in learning to code Pythonically! -- \ “When we talk to God, we're praying. When God talks to us, | `\ we're schizophrenic.” —Jane Wagner, via Lily Tomlin, 1985 | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 25 Jun 2013 00:31, alex23 wuwe...@gmail.com wrote: On 25/06/2013 6:12 AM, Ian Kelly wrote: On Mon, Jun 24, 2013 at 1:52 PM, jim...@aol.com wrote: Syntax: fwhile X in ListY and conditionZ: fwhile would act much like 'for', but would stop if the condition after the 'and' is no longer True. I would advocate using the break myself. Another alternative is this: for X in itertools.takewhile(lambda X: conditionZ, ListY): ... I'd probably just go with a generator expression to feed the for loop: for X in (i for i in ListY if conditionZ): That is nice but it's not lazy. If the condition or the iterables took too long to compute, it would be troublesome. -- http://mail.python.org/mailman/listinfo/python-list
Re: n00b question on spacing
On 23/06/2013 3:43 AM, Mark Janssen wrote: There was a recent discussion about this (under implicit string concatenation). It seems this is a part of the python language specification that was simply undefined. It's part of the language reference, not an accidental artifact: http://docs.python.org/2/reference/lexical_analysis.html#string-literal-concatenation -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the semantics meaning of 'object'?
On Mon, 24 Jun 2013 08:58:23 -0700, Mark Janssen wrote: Mostly I'm saying that super() is badly named. What else would you call a function that does lookups on the current object's superclasses? ^. You make a symbol for it. ^__init__(foo, bar) If you want Perl, you can find it here: http://www.perl.org/ Or even more scary: https://en.wikipedia.org/wiki/APL_syntax_and_symbols ^ won't do the job, because it's already used for bitwise-xor. I suppose that *technically* it could be used as either a binary or unary operator, like +, -, *, **, but I don't think it could be used as both an operator and an identifier. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 25/06/2013 9:35 AM, Fábio Santos wrote: I'd probably just go with a generator expression to feed the for loop: for X in (i for i in ListY if conditionZ): That is nice but it's not lazy. If the condition or the iterables took too long to compute, it would be troublesome. I'm not sure I follow. It's a generator expression, not a list comprehension, so the condition will be evaluated per item iterated over in the generator, not across all valid items in ListY at once. -- http://mail.python.org/mailman/listinfo/python-list
Re: n00b question on spacing
On Mon, Jun 24, 2013 at 4:48 PM, alex23 wuwe...@gmail.com wrote: On 23/06/2013 3:43 AM, Mark Janssen wrote: There was a recent discussion about this (under implicit string concatenation). It seems this is a part of the python language specification that was simply undefined. It's part of the language reference, not an accidental artifact: http://docs.python.org/2/reference/lexical_analysis.html#string-literal-concatenation When I say specification, I mean specified in the formal notation (BNF, etc). whitespace is not defined (otherwise there would be a line in the token list for linefeed and carriagereturn. -- MarkJ Tacoma, Washington -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On 25 Jun 2013 01:08, alex23 wuwe...@gmail.com wrote:
On 25/06/2013 9:35 AM, Fábio Santos wrote:
I'd probably just go with a generator expression to feed the for loop:
for X in (i for i in ListY if conditionZ):
That is nice but it's not lazy. If the condition or the iterables took
too long to compute, it would be troublesome.
I'm not sure I follow. It's a generator expression, not a list
comprehension, so the condition will be evaluated per item iterated over in
the generator, not across all valid items in ListY at once.
for X in (i for i in open('largefile') if is_part_of_header(i)):
The above code would be wasting time on IO and processing. It would load
another line and calculate the condition for every line of the large file
and I just wanted to loop over the few header lines.
itertools.takewhile and fwhile/for..while actually stops the loop when the
condition is not meant, while your example keeps checking the condition
until the end of file, even though it is a generator expression.
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Re: Is this PEP-able? fwhile
On Tue, Jun 25, 2013 at 10:19 AM, Fábio Santos fabiosantos...@gmail.com
wrote:
for X in (i for i in open('largefile') if is_part_of_header(i)):
The above code would be wasting time on IO and processing. It would load
another line and calculate the condition for every line of the large file
and I just wanted to loop over the few header lines.
itertools.takewhile and fwhile/for..while actually stops the loop when the
condition is not meant, while your example keeps checking the condition
until the end of file, even though it is a generator expression.
Ah yes, of course, my bad.
It's still possible by raising a StopIteration within the condition
function:
def is_part_of_header(x):
if header_condition:
return True
else:
raise StopIteration
But yes, by this point any clarity of the generator expression approach
comes with the cost of more explicit setup of the breaking condition.
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Re: Looking for a name for a deployment framework...
In article kqa28v$4us$1...@dont-email.me, Cousin Stanley cousinstan...@gmail.com wrote: jonathan.slend...@gmail.com wrote: Any suggestions for a good name, for a framework that does automatic server deployments ? asdf : automatic server deployment framework I prefer: Quite Wonderful Electronic Rollout Tool -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Tuesday, June 25, 2013 3:08:57 AM UTC+5:30, Chris Angelico wrote: On Tue, Jun 25, 2013 at 5:52 AM, wrote: (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs... Why? Why on earth should break/continue be avoided? Because breaks and continues are just goto-in-disguise? [Well so is while and if and function-call and... Who is to say that?] -- http://mail.python.org/mailman/listinfo/python-list
Re: (newbye) exceptions list for python3 classes
On 06/24/2013 05:43 PM, chrem wrote:
Le 24/06/13 23:35, chrem a écrit :
Hi,
what is the best way to find out all exceptions for a class?
E.g. I want to find out all exceptions related to the zipfile (I'm
searching for the Bad password exception syntax).
thanks for your help or feedback,
Christophe
without exception, it shown:
RuntimeError: ('Bad password for file', zipfile.ZipInfo object at
0x100756690)
then I tried:
except zipfile.BadPassword:
You cannot just make up a name, and hope that it's a valid exception
type. There is no such exception as zipfile.BadPassword. There is an
exception, zipfile.BadZipFile,
as mentioned at
http://docs.python.org/3.3/library/zipfile.html#zipfile.BadZipFile
But of course that's not what you want. The exception type above is
RuntimeError, the part before the colon.
print(Password does not match)
but it returned:
AttributeError: 'module' object has no attribute 'BadPassword'
--
DaveA
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Re: Python development tools
在 2013年6月24日星期一UTC+8上午4时40分07秒，cutems93写道： Hello, I am new to python development and I want to know what kinds of tools people use for python development. I went to Python website and found several tools. 1. Automated Refactoring Tools 2. Bug Tracking 3. Configuration And BuildTools 4. Distribution Utilities 5. Documentation Tools 6. Integrated Development Environments 7. Python Debuggers 8. Python Editors 9. Python Shells 10. Test Software 11. Useful Modules 12. Version Control What else do I need? Also, which software is used in daily base? I know version control software and bug tracking software are used almost everyday by developers. Which software is used less often? Also, I will use GUI interface for Python. What kind of widget toolkits do you recommend? I know there are GTK+ and Qt. Thank you in advance! -Min S.- It's a big question. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
On Tuesday, June 25, 2013 4:41:22 AM UTC+5:30, Ben Finney wrote: rusi writes: I dont however think that the two philosophies are the same. See http://www.tcl.tk/doc/scripting.html That essay constrasts “scripting” versus “system programming”, a useful (though terminologically confusing) distinction. It's a mistake to think that essay contrasts “scripting“ versus “programming”. But the essay never justifies its aversion to “programming” as a term for what it's describing, so that mistake is easy to make. The essay is 15 years old. So a bit dated. Referred to it as it conveys the sense/philosophy of scripting. On Monday, June 24, 2013 11:50:38 AM UTC+5:30, Ben Finney wrote: Any time someone has shown me a “Python script”, I don't see how it's different from what I'd call a “Python program”. So I just mentally replace “scripting with “programming”. If you are saying that python spans the scripting to programming spectrum exceptionally well, I agree. I'm saying that “scripting” is a complete subset of “programming”, so it's nonsense to talk about “the scripting-to-programming spectrum”. Scripting is, always, programming. Scripts are, always, programs. (But not vice-versa; I do acknowledge there is more to programming than scripting.) I say this because anything anyone has said to me about the former is always something included already by the latter. So I don't see much need for treating scripts as somehow distinct from programs, or scripting as somehow distinct from programming. Whenever you're doing the former, you're doing the latter by definition. My personal associations with the word 'scripting' - Cavalier attitude towards efficiency - No interest (and maybe some scorn) towards over-engineering (hence OOP) - Heavy use of regular expressions, also sophistication of the command-line args - A sense (maybe vague) of being glue more than computation, eg. a bash script is almost certain to invoke something other than builtins alone and is more likely to invoke a non-bash script than a bash script. For a C program that likelihood is the other way round. For python it could be either -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
On 25/06/2013 03:24, rusi wrote: On Tuesday, June 25, 2013 4:41:22 AM UTC+5:30, Ben Finney wrote: rusi writes: I dont however think that the two philosophies are the same. See http://www.tcl.tk/doc/scripting.html That essay constrasts “scripting” versus “system programming”, a useful (though terminologically confusing) distinction. It's a mistake to think that essay contrasts “scripting“ versus “programming”. But the essay never justifies its aversion to “programming” as a term for what it's describing, so that mistake is easy to make. The essay is 15 years old. So a bit dated. Referred to it as it conveys the sense/philosophy of scripting. On Monday, June 24, 2013 11:50:38 AM UTC+5:30, Ben Finney wrote: Any time someone has shown me a “Python script”, I don't see how it's different from what I'd call a “Python program”. So I just mentally replace “scripting with “programming”. If you are saying that python spans the scripting to programming spectrum exceptionally well, I agree. I'm saying that “scripting” is a complete subset of “programming”, so it's nonsense to talk about “the scripting-to-programming spectrum”. Scripting is, always, programming. Scripts are, always, programs. (But not vice-versa; I do acknowledge there is more to programming than scripting.) I say this because anything anyone has said to me about the former is always something included already by the latter. So I don't see much need for treating scripts as somehow distinct from programs, or scripting as somehow distinct from programming. Whenever you're doing the former, you're doing the latter by definition. My personal associations with the word 'scripting' - Cavalier attitude towards efficiency And convenience for the programmer. Manipulating long texts using variable-length strings? Yes, I know it's inefficient, but it's still faster than doing it by hand! - No interest (and maybe some scorn) towards over-engineering (hence OOP) - Heavy use of regular expressions, also sophistication of the command-line args - A sense (maybe vague) of being glue more than computation, eg. a bash script is almost certain to invoke something other than builtins alone and is more likely to invoke a non-bash script than a bash script. For a C program that likelihood is the other way round. For python it could be either Automating tasks, e.g. controlling other applications and stringing together tasks that you would otherwise be doing by hand. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python development tools
On Tuesday, June 25, 2013 8:09:19 AM UTC+5:30, MRAB wrote: And convenience for the programmer. Manipulating long texts using variable-length strings? Yes, I know it's inefficient, but it's still faster than doing it by hand! Well... did not say it because it tends to be emotionally charged :-) C programmers find C convenient. Haskell programmers find monads convenient Python programmers are (increasingly) finding OOP convenient Automating tasks, e.g. controlling other applications and stringing together tasks that you would otherwise be doing by hand. Yes scripting is more programmer oriented as against GUIs which are more user oriented. Related: scripting is more FP-ish, whereas GUIs are more OOP-ish. A shell pipeline is really function composition in different syntax and a back-quoted command is close to a higher-order function. By contrast a windows user clicks on a 'doc' and it just 'opens' Many of them dont exactly know the diff between a doc and MsWord. And even a supposed programmer (like yours truly) has a hell of a time finding the executable when needed. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Tue, Jun 25, 2013 at 12:01 PM, rusi rustompm...@gmail.com wrote: On Tuesday, June 25, 2013 3:08:57 AM UTC+5:30, Chris Angelico wrote: On Tue, Jun 25, 2013 at 5:52 AM, wrote: (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs... Why? Why on earth should break/continue be avoided? Because breaks and continues are just goto-in-disguise? [Well so is while and if and function-call and... Who is to say that?] And that's still not a reason imho. You've just pointed out that they're all control-flow. :) ChrisA -- http://mail.python.org/mailman/listinfo/python-list
io module and pdf question
Would like to get your opinion on this. Currently to get the metadata out of a
pdf file, I loop through the guts of the file. I know it's not the greatest
idea to do this, but I'm trying to avoid extra modules, etc.
Adobe javascript was used to insert the metadata, so the added data looks
something like this:
XYZ:colorList=DarkBlue,Yellow
With python 2.7, it successfully loops through the file contents and I'm able
to find the line that contains XYZ:colorList.
However, when I try to run it with python 3, it errors:
File
/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/codecs.py,
line 300, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe2 in position 10:
invalid continuation byte
I've done some research on this, and it looks like encoding it to latin-1
works. I also found that if I use the io module, it will work on both python
2.7 and 3.3. For example:
--
import io
import os
pdfPath = '~/Desktop/test.pdf'
colorlistData = ''
with io.open(os.path.expanduser(pdfPath), 'r', encoding='latin-1') as f:
for i in f:
if 'XYZ:colorList' in i:
colorlistData = i.split('XYZ:colorList')[1]
break
print(colorlistData)
--
As you can tell, I'm clueless in how exactly this works and am hoping someone
can give me some insight on:
1. Is there another way to get metadata out of a pdf without having to install
another module?
2. Is it safe to assume pdf files should always be encoded as latin-1 (when
trying to read it this way)? Is there a chance they could be something else?
3. Is the io module a good way to pursue this?
Thanks for your help!
Jay
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Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 8:54 PM, Chris Angelico ros...@gmail.com wrote: On Tue, Jun 25, 2013 at 12:01 PM, rusi rustompm...@gmail.com wrote: On Tuesday, June 25, 2013 3:08:57 AM UTC+5:30, Chris Angelico wrote: On Tue, Jun 25, 2013 at 5:52 AM, wrote: (NOTE: Many people are being taught to avoid 'break' and 'continue' at all costs... Why? Why on earth should break/continue be avoided? Because breaks and continues are just goto-in-disguise? [Well so is while and if and function-call and... Who is to say that?] And that's still not a reason imho. You've just pointed out that they're all control-flow. :) ChrisA The reason I was given (which I promptly ignored, of course) is that it's best practice to only have one exit point for a block of code. Only one way of terminating your loop, only one return per function, never use exceptions, etc. I think it originally came about as a way to make sure that your clean-up code was called (and to make it easier for code reviewers to make sure your clean up code was called) and then started being passed around as a rule among programming teachers who didn't have any experience outside the classroom. -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a name for a deployment framework...
On Jun 24, 2013 5:36 AM, jonathan.slend...@gmail.com wrote: Hi all, Any suggestions for a good name, for a framework that does automatic server deployments? It's like Fabric, but more powerful. It has some similarities with Puppet, Chef and Saltstack, but is written in Python. Er, Salt is likewise written in Python. (Your statement seemed to imply otherwise.) Cheers, Chris -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this PEP-able? fwhile
On Mon, Jun 24, 2013 at 6:41 PM, wu wei wuwe...@gmail.com wrote: It's still possible by raising a StopIteration within the condition function: def is_part_of_header(x): if header_condition: return True else: raise StopIteration Which is basically just taking the break and moving it to somewhere else in the code, and meanwhile rendering the is_part_of_header function non-reusable. -- http://mail.python.org/mailman/listinfo/python-list
[issue18234] Unicodedata module should provide access to codepoint aliases
Marc-Andre Lemburg added the comment: On 23.06.2013 22:43, Alexander Belopolsky wrote: Alexander Belopolsky added the comment: unicodedata.name() was discussed in #12353 (msg144739) where MvL argued that misspelled names are better than corrected because they are more likely to appear misspelled in other sources. I am not sure I buy this argument. Someone googling for 'BYZANTINE MUSICAL SYMBOL FHTORA SKLIRON CHROMA VASIS' will probably just enter BYZANTINE VASIS and find what he or she needs. A more likely scenario is someone trying to get all FTHORA symbols using a naive code like this: [hex(i) for i in range(1114112) if 'FTHORA' in ud.name(chr(i), '')]. Even more likely scenario is someone seeing a fancy symbol on the web and wanting to use it in a python program. Such programmer would copy the symbol to python prompt, call unicode.name() and copy the result in the program. Do we want to encourage people to perpetuate the mistake that Unicode has corrected? I don't think the issue of control codes names was discussed in #12353. I see no downside with returning the first alias in case no name is present. We should stick to the rules. Please leave the function as it is, i.e. a 1-1 mapping to the official, non-changing Unicode name reference (including spelling errors, etc). Same with code points that have no name. If you want to expose the aliases, you can do so in a new function, say .aliases() which then returns the list of aliases of a character (including the original name, if available). If we change the return values of .name() to whatever we think would be more usable, we'd be modifying how Python programmers see the Unicode database. That's not the purpose of the module. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18234 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
