🌐 Mailman 3 July 2011 - Python-list - python.org

Re: urllib, urlretrieve method, how to get headers?
by Даниил Рыжков July 2, 2011

July 2, 2011

Thanks, everyone! Problem solved. -- Regards, Daniil

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Does anyone know of a python tapi module
by Alister Ware July 2, 2011

July 2, 2011

The subject probably say is all but to elaborate. I am looking for a way to communicate with a tapi driver for a PBX so I can experiment with creating some CTI (Computer Telephony Integration) software. --

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How to get a dateiled process information on windows?
by Leandro Ferreira July 1, 2011

July 1, 2011

I need to write an application that monitors the memory consumption of a process, there is some library that facilitates this work? I searched on google found nothing more interesting. Thanks in advance

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Re: Enhanced dir() function
by Steven D'Aprano July 1, 2011

July 1, 2011

Tim Chase wrote: > On 06/30/2011 11:29 PM, Steven D'Aprano wrote: >> The dir() function is designed for interactive use, inspecting objects >> for the names of attributes and methods. >> >> Here is an enhanced version that allows you to pass a glob to filter the >> names you see: >> >> Comments and improvements welcome. > > Having not seen any other comments on it fly by, I thought I'd > respond. While in general I like the idea, I'm not sure when I'd > go to the effort of bringing the function into my namespace when > I could just do something like > > >>> [s for s in dir(...) if test_of_interest(s)] If test_of_interest is complex, then the list comp is the better solution. Globbing dir is intended for simple globs (naturally!), not complex filter functions of arbitrary complexity. The equivalent is globbing in the shell: [steve@sylar python]$ dir p*.py parallel_map.py partition.py perms.py proc.py pyprimes.py paragraphs.py peekable.py pi.py progress.py > If it came in as an effortless (i.e. O(1) where I do it once and > never again; not an O(n) where n=the number of times I invoke > Python) default replacement for dir(), I'd reach for it a lot > more readily. I seem to recall there's some environment-var or > magic file-name that gets sourced on every startup. There is some talk on the python-ideas mailing list about enhancing the built-in dir(). But in the meantime, you can add it to your site.py module, or better still, use your own personal startup file rather than the system site.py. I have an environment variable set in my .bashrc file: export PYTHONSTARTUP=/home/steve/python/startup.py and then put code I want to run at startup in startup.py. For Windows users, I don't know how to set environment variables, but I dare say it would be something similar: set the environment variable PYTHONSTARTUP to a file name, and put the code in that file. > I use the list-comp version on a regular basis: > > # implementation of which magic methods? > [s for s in dir(foo) if s.startswith('__') and s.endswith('__')] This would become: dir(foo, "__*__") > # ignore magic methods > [s for s in dir(foo) if not (s.startswith('__') and > s.endswith('__'))] dir(foo, "[!_]*[!_]") although strictly speaking, my version only tests for one leading and trailing underscore, not two. > # constants > [s for s in dir(foo) if s.isupper()] That's beyond the capabilities of simple globbing. > # keywording > [s for s in dir(foo) if 'bar' in s.lower()] I'm of two minds about case-insensitive globbing. It could be done with a slight change to the function, but I'm not sure if I want to. > Anyways, even if it just includes a brief blurb about "and this > is how you get it automatically in every Python session" (or a > link to the docs on how to do that), it would raise it from "meh" > to "nifty". Thanks for the feedback. -- Steven

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ANN: pyparsing 1.5.6 released!
by Paul McGuire July 1, 2011

July 1, 2011

After about 10 months, there is a new release of pyparsing, version 1.5.6. This release contains some small enhancements, some bugfixes, and some new examples. Most notably, this release includes the first public release of the Verilog parser. I have tired of restricting this parser for commercial use, and so I am distributing it under the same license as pyparsing, with the request that if you use it for commmercial use, please make a commensurate donation to your local Red Cross. Change summary: --------------- - Cleanup of parse action normalizing code, to be more version- tolerant, and robust in the face of future Python versions - much thanks to Raymond Hettinger for this rewrite! - Removal of exception cacheing, addressing a memory leak condition in Python 3. Thanks to Michael Droettboom and the Cape Town PUG for their analysis and work on this problem! - Fixed bug when using packrat parsing, where a previously parsed expression would duplicate subsequent tokens - reported by Frankie Ribery on stackoverflow, thanks! - Added 'ungroup' helper method, to address token grouping done implicitly by And expressions, even if only one expression in the And actually returns any text - also inspired by stackoverflow discussion with Frankie Ribery! - Fixed bug in srange, which accepted escaped hex characters of the form '\0x##', but should be '\x##'. Both forms will be supported for backwards compatibility. - Enhancement to countedArray, accepting an optional expression to be used for matching the leading integer count - proposed by Mathias on the pyparsing mailing list, good idea! - Added the Verilog parser to the provided set of examples, under the MIT license. While this frees up this parser for any use, if you find yourself using it in a commercial purpose, please consider making a charitable donation as described in the parser's header. - Added the excludeChars argument to the Word class, to simplify defining a word composed of all characters in a large range except for one or two. Suggested by JesterEE on the pyparsing wiki. - Added optional overlap parameter to scanString, to return overlapping matches found in the source text. - Updated oneOf internal regular expression generation, with improved parse time performance. - Slight performance improvement in transformString, removing empty strings from the list of string fragments built while scanning the source text, before calling ''.join. Especially useful when using transformString to strip out selected text. - Enhanced form of using the "expr('name')" style of results naming, in lieu of calling setResultsName. If name ends with an '*', then this is equivalent to expr.setResultsName('name',listAllMatches=True). - Fixed up internal list flattener to use iteration instead of recursion, to avoid stack overflow when transforming large files. - Added other new examples: . protobuf parser - parses Google's protobuf language . btpyparse - a BibTex parser contributed by Matthew Brett, with test suite test_bibparse.py (thanks, Matthew!) . groupUsingListAllMatches.py - demo using trailing '*' for results names Download pyparsing 1.5.6 at http://sourceforge.net/projects/pyparsing/, or use 'easy_install pyparsing'. You can also access pyparsing's epydoc documentation online at http://packages.python.org/pyparsing/. The pyparsing Wiki is at http://pyparsing.wikispaces.com. -- Paul ======================================== Pyparsing is a pure-Python class library for quickly developing recursive-descent parsers. Parser grammars are assembled directly in the calling Python code, using classes such as Literal, Word, OneOrMore, Optional, etc., combined with operators '+', '|', and '^' for And, MatchFirst, and Or. No separate code-generation or external files are required. Pyparsing can be used in many cases in place of regular expressions, with shorter learning curve and greater readability and maintainability. Pyparsing comes with a number of parsing examples, including: - "Hello, World!" (English, Korean, Greek, and Spanish(new)) - chemical formulas - Verilog parser - Google protobuf parser - time expression parser/evaluator - configuration file parser - web page URL extractor - 5-function arithmetic expression parser - subset of CORBA IDL - chess portable game notation - simple SQL parser - Mozilla calendar file parser - EBNF parser/compiler - Python value string parser (lists, dicts, tuples, with nesting) (safe alternative to eval) - HTML tag stripper - S-expression parser - macro substitution preprocessor

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Using decorators with argument in Python
by Jigar Tanna July 1, 2011

July 1, 2011

I am new to Python and Django, was going through the concept of decorators where I came across a special case of using arguments with decorators Below is the code for memoization where I was looking at the concept... cache = {} def get_key(function, *args, **kw) : key = '%s. %s: ' % (function. __module__,function. __name__) hash_args = [ str(arg) for arg in args] hash_kw = [' %s: %s' % (k, hash(v) ) for k, v in kw.items() ] return ' %s:: %s: : %s' % (key, hash_args, hash_kw) def memoize(get_key=get_key, cache=cache) : def _memoize( function) : print function def __memoize(*args, **kw) : key = get_key(function, *args, **kw) try: return cache[key] except KeyError: cache[key] = function( *args, **kw) return cache[key] return __memoize return _memoize @memoize() def factory(n) : return n * n # testcase #print factory(3) # # coming across to certain views from people, it is not a good practice to use decorators with arguments (i.e. @memoize() ) and instead it is good to just use @memoize. Can any of you guys explain me advantages and disadvantages of using each of them

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FOX Toolkit
by Gisle Vanem July 1, 2011

July 1, 2011

In http://docs.python.org/faq/gui.html I came across FOX Toolkit and the binding FXPy. The latter, it seems is no longer officially supported (hasn't for the last 7-8 years). So my question. Has anybody to your knowledge tweaked FOX and FXPy to work with Python 2.7? --gv

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Re: Trying to chain processes together on a pipeline
by Peter Otten July 1, 2011

July 1, 2011

Andrew Berg wrote: > Okay, so I've refactored those except WindowsError blocks into calls to > a function and fixed the os.devnull bug, but I still can't get the > triple chain working. I added calls to ffmpeg_proc.stdout.close() and > sox_proc.stdout.close(), but I really am not sure where to put them. The > following code works if SoX isn't part of the chain (that is, if vol == > 1), but not otherwise (the Nero encoder says "truncation error" after it > finishes; the same error I get if omit the close() calls): I can't reproduce your setup, but I'd try using communicate() instead of wait() and close().

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Re: urllib, urlretrieve method, how to get headers?
by Peter Otten July 1, 2011

July 1, 2011

Даниил Рыжков wrote: > How can I get headers with urlretrieve? I want to send request and get > headers with necessary information before I execute urlretrieve(). Or > are there any alternatives for urlretrieve()? It's easy to do it manually: >>> import urllib2 Connect to website and inspect headers: >>> f = urllib2.urlopen("http://www.python.org") >>> f.headers["Content-Type"] 'text/html' Write page content to file: >>> with open("tmp.html", "w") as dest: ... dest.writelines(f) ... Did we get what we expected? >>> with open("tmp.html") as f: print f.read().split("title")[1] ... >Python Programming Language – Official Website</ >>>

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urllib, urlretrieve method, how to get headers?
by Даниил Рыжков July 1, 2011

July 1, 2011

Hello, everyone! How can I get headers with urlretrieve? I want to send request and get headers with necessary information before I execute urlretrieve(). Or are there any alternatives for urlretrieve()? -- Regards, Daniil

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