Mailman 3 August 2011 - Python-ideas

Re: [Python-ideas] anonymous object support
by dag.odenhall＠gmail.com Aug. 7, 2011

Aug. 7, 2011

2011/8/4 Matej Lieskovský <lieskovsky.matej(a)googlemail.com>: > Um, I'm kinda new round here but here goes: > If I understood the problem, we are looking for a way of creating an object > which has no specific class. > My proposal: > perhaps a "namespace" statement would do, behaving somewhat like this: > namespace MyObject: > statements > is equivalent to: > class MyClass(object): > statements > MyObject = MyClass() > … [View More]

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change NoneType, NotImplementedType, & ellipses to return the appropriate singleton
by Ethan Furman Aug. 7, 2011

Aug. 7, 2011

Consider: Python 3.2 (r32:88445, Feb 20 2011, 21:29:02) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. --> for ins in ({0:'0'}, (1,), set([2, 3]), [4, 5], 6, 'seven', ... 8.0, True, None): ... print(type(ins)) ... type(ins)() ... <class 'dict'> {} <class 'tuple'> () <class 'set'> set() <class 'list'> [] <class 'int'> 0 <class 'str'> '' <class 'float'> 0.0 <class 'bool'> False &… [View More]

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Change repr(Ellipsis) to '...'
by dag.odenhall＠gmail.com Aug. 7, 2011

Aug. 7, 2011

Now that it is valid in any expressions, I'd argue the repr should reflect the literal syntax. There are however some reasons this might not be desirable: ellipsis is used to represent recursive objects, and by reprlib when summarizing long reprs. Thus there would be ambiguity. A counter-argument may be that a repr isn't intended to be completely unambiguous, reversible or parseable - in deed many objects mimic the literal syntax of builtin types even though they add special behavior. I was … [View More]

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Make compile('1\n2\n', '', 'single') raise an exception instead of silently truncating?
by Devin Jeanpierre Aug. 6, 2011

Aug. 6, 2011

compile('1\n2\n', '','single') == compile('1\n', '','single'). That is, it ignores the second statement ('2\n'), without offering a way for the caller to detect this. Considering that 'single' is primarily used to emulate the behaviour of the Python interpreter, most of the time, giving it multiple statements is an impossibility, and so that case doesn't matter and could raise an exception without affecting existing code. For example, the code module meets this description, as do debuggers … [View More]

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Re: [Python-ideas] Access to function objects
by Christopher King Aug. 6, 2011

Aug. 6, 2011

Whoops, sent it to the tutors On Sat, Aug 6, 2011 at 2:24 PM, Christopher King <g.nius.ck(a)gmail.com>wrote: > > > On Sat, Aug 6, 2011 at 4:10 AM, David Townshend <aquavitae69(a)gmail.com>wrote: > >> def counter(add) as func: >> if not hasattr(func, 'count'): >> func.count = 0 >> func.count += 1 >> print(func.count) >> > You already can do that without an as statment. > > >>> def counter(add): &… [View More]

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shelve and sqlite
by Yuval Greenfield Aug. 5, 2011

Aug. 5, 2011

Hi Pydeas, I encountered exceptions like File "c:\python27\lib\site-packages\filecache-0.67-py2.7.egg\filecache\__init__.py", line 82, in function_with_cache rv = function.__db[key] File "c:\python27\lib\shelve.py", line 122, in __getitem__ value = Unpickler(f).load() cPickle.UnpicklingError: could not find MARK With my filecache module which I have a feeling are related to database failures upon abrupt termination of the process. If I write the class SqliteShelf, would it be … [View More]

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New imaplib implementation for Python 3.2+ standard library
by Maxim Khitrov Aug. 4, 2011

Aug. 4, 2011

Hello python-ideas, My most recent project lead me down a path that eventually ended up at a new implementation of imaplib based on [RFC-3501]. Although I started the project by gradually adding functionality to the existing IMAP4 library, some of the features that I required simply could not be merged in (without breaking everything). As a result, I wrote my own version of the library, which incorporates all existing functionality of imaplib and includes many of my own improvements. I wrote … [View More]

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anonymous object support
by Herman Sheremetyev Aug. 4, 2011

Aug. 4, 2011

It is currently somewhat difficult/awkward to create arbitrary "anonymous" objects in Python. For example, to make some object that simply has a foo() method you have to declare a class that defines foo() and instantiate it: class Foo: def foo(self, x): return x obj = Foo() It would be a bit easier if Python allowed attributes to be set on instances of builtins the way it does for user-defined classes. This would at least allow something like: obj = object() obj.foo = lambda x: x Alas, … [View More]

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Cookies insanity
by Ram Rachum Aug. 4, 2011

Aug. 4, 2011

Hello folks, About a week ago I was trying to do a tiny web project in Python. I wanted to send a request to some website, get a cookie, and then send that cookie on the next request. I could not believe how convoluted that task has turned out to be. Check out my StackOverflow question: http://stackoverflow.com/questions/6878418/putting-a-cookie-in-a-cookiejar Unless I'm missing something, this looks insane to me. Why is so much code needed to do such a simple task? Why can't this be done … [View More]

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Re: [Python-ideas] multiple intro statements [was: combine for/with statement]
by Jim Jewett Aug. 3, 2011

Aug. 3, 2011

On Wed, Aug 3, 2011 at 4:11 AM, Greg Ewing <greg.ewing(a)canterbury.ac.nz> wrote: > With a slight relaxation of the rules concerning statements > on a single line, one could write > > for bar in foo: with context: if baz: > # stuff > > Not that I'd really advocate that, but it might help to > shut up the people who keep requesting this sort of thing. hmm... I actually sort of like that ... statement: statement: … [View More]

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