🌐 Mailman 3 September 2007 - Python-list - python.org

Re: Can you please give me some advice?
by Steven D'Aprano Oct. 2, 2007

Oct. 2, 2007

On Sun, 30 Sep 2007 19:22:07 +0900, Byung-Hee HWANG wrote: > Hi there, > > What is different between Ruby and Python? I am wondering what language > is really mine for work. Somebody tell me Ruby is clean or Python is > really easy! Anyway I will really make decision today what I have to > study from now on. What I make the decision is more difficult than to > know why I have to learn English. Yeah I do not like to learn English > because it is just very painful.. > > Can you please give me some advice? Hello World in Ruby (and a few other languages): http://www.oreillynet.com/ruby/blog/2005/12/hello_world.html More here: http://en.wikibooks.org/wiki/Programming:Ruby_Creating_Ruby_programs Hello World in Python: http://python.about.com/od/gettingstarted/ss/helloworld.htm A Python tutorial: http://docs.python.org/tut/ Sorry about the English. -- Steven

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Re: ANN: PyPE 2.8.7
by stef Oct. 2, 2007

Oct. 2, 2007

Josiah Carlson wrote: > === What is PyPE? === > PyPE (Python Programmers' Editor) was written in order to offer a > lightweight but powerful editor for those who think emacs is too much > and idle is too little. Syntax highlighting is included out of the box, > as is multiple open documents via tabs. > > sounds very good, so now I want to try it ... ... the windows ansi zip file is corrupted :-( ... the unicode version crashes :-( This is what the log file tells: Traceback (most recent call last): File "pype.py", line 110, in ? File "zipextimporter.pyc", line 78, in load_module File "configuration.pyc", line 149, in ? Exception: Unable to create config directory: 'G:\\.pype' I don't have a G-drive ;-) cheers, Stef Mientki

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Re: Tapping into the access of an int instance
by chris.monsanto＠gmail.com Oct. 2, 2007

Oct. 2, 2007

On Sep 20, 1:21 pm, "Tor Erik S�nvisen" <toreri...(a)gmail.com> wrote: > Hi, > > Does anyone know how to interrupt the lookup of an integer value? I > know I need to subclass int, since builtin types can't be altered > directly... > > Below is how far I've come... What I want is to tap into the access of > instance i's value 1... > > >>> class Int(int): > > def __init__(self, *a, **k): > super(Int, self).__init__(self, *a, **k) > > >>> i = Int(1) > >>> i > > 1 > > Regards, > Tor Erik While I'm not *totally* sure what you are asking, you can access the first parameter you passed in __init__ via args[0].

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Re: Python 3.0 migration plans?
by TheFlyingDutchman Oct. 2, 2007

Oct. 2, 2007

It seems that Python 3 is more significant for what it removes than what it adds. What are the additions that people find the most compelling?

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Re: Python 3.0 migration plans?
by John Roth Oct. 2, 2007

Oct. 2, 2007

On Sep 27, 5:37 pm, Steve Holden <st...(a)holdenweb.com> wrote: > I wondered if a straw poll could get some idea of readers' thoughts > about when they will be migrating to 3.0 on, so I used the new widget on > Blogger to add a poll for that. > > I'd appreciate if if you would go to > > http://holdenweb.blogspot.com/ > > and register your vote on your intended migration timescale. > > Thanks! > -- > Steve Holden +1 571 484 6266 +1 800 494 3119 > Holden Web LLC/Ltd http://www.holdenweb.com > Skype: holdenweb http://del.icio.us/steve.holden > > Sorry, the dog ate my .sigline I was thinking of starting work on converting Python FIT to 3.0, and then they posted PEP 3137. I think it's a real good idea, but it shows that 3.0a1 isn't ready for a conversion effort. http://www.python.org/dev/peps/pep-3137/ I'll look at it again in a year or so. John Roth

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Re: Reentrancy of Python interpreter
by bvukov＠yahoo.com Oct. 1, 2007

Oct. 1, 2007

On Sep 28, 11:31 pm, Brad Johnson <Brad.John...(a)ballardtech.com> wrote: > I have embedded a single threaded instance of the Python interpreter in my > application. > > I have a place where I execute a Python command that calls into C++ code which > then in turn calls back into Python using the same interpreter. I get a fatal > error which is "PyThreadStage_Get: no current thread." > > I guess I understand why I can't have two invocations of the same interpreter > thread in one call stack, but how would I go about solving this? Looks like ( from PyThreadStage_Get error ) that you lost the GIL. You probably entered some C++ code and encapsulated you're work in the Py_BEGIN_ALLOW_THREADS <code> Py_END_ALLOW_THREADS but you're <code> is calling back the Python function, and you forgot to acquire back the GIL.

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using inspect on pygtk
by Chris Pax Oct. 1, 2007

Oct. 1, 2007

Hello, I recently been trying to use the inspect module to inspect the arguments of gtk objects, such as gtk.Button. I tried like this: inspect.getargspec(gtk.Button.__init__) and get the fallowing error: File "<stdin>", line 1, in <module> File "/usr/lib/python2.5/inspect.py", line 743, in getargspec raise TypeError('arg is not a Python function') TypeError: arg is not a Python function I have been trying to do this through code so that I don't have to have a list of all possible gtk classes and their arguments.

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Re: Program inefficiency?
by hall.jeff＠gmail.com Oct. 1, 2007

Oct. 1, 2007

The search is trying to replace the spaces in our bookmarks (and the links that go to those bookmarks)... The bookmark tag looks like this: <a href="Web_Sites.htm#A Web Sites"> and the bookmark tag looks like this <a name="A Web Sites"></a> some pitfalls I've already run up against... SOMETIMES (but not often) the a and the href (or name) is split across a line... this led me to just drop the "<a" from the front If there are no spaces, SOME (but again, not all) of the "<a name" tags don't have "'s... this is a problem because we're having to replace all special characters with _'s... Some of our bookmarks are quite wordy (we found one yesterday with 11 spaces) href is sometimes all caps (HREF) As you can imagine, there are alot of corner cases and I felt it was easier just to be inefficient and write out all the regex cases and loop through them repeatedly... I've also got to work around the stuff already in the system (for example, I need to make certain I'm looking behind the #'s in the bookmark links, otherwise I'll end up replacing legitimate -'s in external web site addresses) I think Pablo is correct that a single (or perhaps two) RE statements are all that is needed... perhaps: p1= re.compile('(href=|HREF=)+(.*)(#)+(.*)(\w\'\?-<: )+(.*)(">)+') and the corresponding name replace and then the one corner case we ran into of p100= re.compile('(a name=)+(.*)(-)+(.*)(></a>)+')

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sorteddict PEP proposal [started off as orderedict]
by Mark Summerfield Oct. 1, 2007

Oct. 1, 2007

Hi, Below is a PEP proposal for a sorteddict. It arises out of a discussion on this list that began a few weeks ago with the subject of "An ordered dictionary for the Python library?", and a similar one on the P3K mailing list with the subject "ordered dict for p3k collections?". If there is positive feedback I will submit the PEP to the reviewers, so if you think it is a good idea please say so. (I'm sure that if you _don't_ like it you'll tell me anyway:-) PEP: XXX Title: Sorted Dictionary Version: $Revision$ Last-Modified: $Date$ Author: Mark Summerfield Status: Draft Type: Standards Track Content-Type: text/plain Created: 25-Sep-2007 Python-Version: 2.6 Post-History: Abstract This PEP proposes the addition of a sorted dictionary class to the standard library's collections module. Rationale When handling collections of key-value data, it is often convenient to access the data in key order. One way to do this is to use an unsorted data structure (e.g., a Python dict), and then sort the keys as needed. Another way is to use a sorted data structure (e.g., a sorteddict as proposed in this PEP), and simply access the keys, knowing that they are always in sorted order. Both approaches make sense in the right circumstances, but Python currently only supports the first approach out of the box. A sorteddict never needs sorting and is ideal for creating indexes to data where the keys are based on some property of the data. Adding a sorteddict to the collections module would not add significantly to the size of Python's standard library, but would provide a very useful data structure. Specification The proposed sorteddict has the same API to the builtin dict, so can be used as a drop-in replacement. The only behavioural difference being that any list returned by the sorteddict (whether of keys, values, or items) will be in key order, and similarly any iterator returned will iterate in key order. In addition, the keys() method has two optional arguments: keys(firstindex : int = None, secondindex : int = None) -> list of keys The parameter names aren't nice, but using say "start" and "end" would be misleading since the intention is for the parameters to work like they do in range(), e.g. sd.keys() # returns a list of all the sorteddict's keys sd.keys(10) # returns a list of the first 10 keys sd.keys(19, 35) # returns a list of the 19th-34th keys inclusive If an out of range index is given, an IndexError exception is raised. Since the sorteddict's data is always kept in key order, indexes (integer offsets) into the sorteddict make sense. Five additional methods are proposed to take advantage of this: key(index : int) -> value item(index : int) -> (key, value) value(index : int) -> key set_value(index : int, value) delete(index : int) Items and values can still be accessed using the key, e.g., sd[key], since all the dict's methods are available. Examples To keep a collection of filenames on a case-insensitive file system in sorted order, we could use code like this: files = collections.sorteddict.sorteddict() for name in os.listdir("."): files[name.lower()] = name We can add new filenames at any time, safe in the knowledge that whenever we call files.values(), we will get the files in case-insensitive alphabetical order. To be able to iterate over a collection of data items in various predetermined orders, we could maintain two or more sorteddicts: itemsByDate = collections.sorteddict.sorteddict() itemsByName = collections.sorteddict.sorteddict() itemsBySize = collections.sorteddict.sorteddict() for item in listOfItems: itemsByDate["%s\t%17X" % (item.date, id(item))] = item itemsByName["%s\t%17X" % (item.name, id(item))] = item itemsBySize["%s\t%17X" % (item.size, id(item))] = item Here we have used the item IDs to ensure key uniqueness. Now we can iterate in date or name order, for example: for item in itemsByDate: print item.name, item.date Implementation A pure Python implementation is available at: http://pypi.python.org/pypi/sorteddict Copyright This document has been placed in the public domain.

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Mysqldb & stderr
by mastro.francesco＠gmail.com Oct. 1, 2007

Oct. 1, 2007

developing a daemon (using python 2.4 and mysqldb 1.2.1_p2) we notes that mysqldb class write on stderr some warnings and error asyncronously (uhmmm.... it's good written? ;P ). If stderr is closed these function raise up an I/O error (obviously). We spent a lot of time to understand for now we redirected stderr on /dev/null, but.. it's a workaround. Someone knows how stop write on stderr (and stdout) on mysqldb? Thanks.

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