Mailman 3 February 2010 - Python-ideas

filter-only list comps
by spir Feb. 27, 2010

Feb. 27, 2010

Hello, I recently realized the following, and wonder whether there is a reason for this, which I am unable to figure out. A list comp can both map and filter: [x*x for x in numbers if x%2==1] When it only maps, we can simply get rid of the filter part: [x*x for x in numbers] Meaning we are not forced to write: [x*x for x in numbers if True] But the analog does not apply to filter-only list comps: [x in numbers if x%2==1] # SyntaxError Why? I find this syntax clear, actually clearer than … [View More]

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op-assign in function argument
by wxyarv Feb. 24, 2010

Feb. 24, 2010

has anybody thought the op-assign in function argument is a good idea? now we can use parameter name to specifie argument, like this: def foo(arg1): pass # call foo(arg1 = "bar") but, if function has default parameter, it will be inconvenience: def foo_with_long_defualts(arg1 = we | are | default | flags | set): pass # call foo_with_long_defaults(arg1 = we | are | default | flags | set | another_flags) so, why not add op-assign support in named argument? … [View More]

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warnings package might provide an Option or a pre-filled OptionParser
by Masklinn Feb. 22, 2010

Feb. 22, 2010

Currently, `warnings` uses the `-W` interpreter-level option for non-programmatic configuration. While nice, this option isn't available out of the box to scripts where the interpreter is implicit (./script.py, or `script` where it's on $PATH). I believe it would be nice if `warnings` provided something one could simply drop into `optparse` to automagically get -W handling, without having to define custom option actions every time. What do you think?

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Merging a generator's "next" and "send" methods?
by Andrey Fedorov Feb. 19, 2010

Feb. 19, 2010

Since .next() seems to be equivalent to .send(None), why wasn't .next() just given an optional parameter which defaults to None? - Andrey On Thu, Oct 1, 2009 at 1:10 PM, Simon Forman <sajmikins(a)gmail.com> wrote: > On Wed, Sep 30, 2009 at 4:24 PM, Andrey Fedorov <anfedorov(a)gmail.com> > wrote: > > As far as I can tell, a generator's .next() is equivalent to .send(None). > Is > > this true? > > They are equivalent AFAIK. > > > If so, [why] … [View More]

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Merge .pyc into .pyo--store multiple code objects in one file?
by Larry Hastings Feb. 15, 2010

Feb. 15, 2010

A .pyc file is made up of these three elements: 4 byte magic number 4 byte timestamp marshaled code object A .pyo file is the same except the code object has been optimized. I ask you: why gunk up the filesystem with two files when one would do? I propose we change the pyc file so it can contain multiple code objects. Or, indeed, multiple arbitrary objects. The .pyc file could become as a general-purpose cache for data relevant to the .py file. For example, perhaps the … [View More]

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Re: [Python-ideas] clear() method for lists
by wxyarv Feb. 12, 2010

Feb. 12, 2010

what about another method clone() (or copy())? i think this maybe useful either. ------------------ Original ------------------ From: "average"<dreamingforward(a)gmail.com>; Date: Mon, Feb 8, 2010 09:14 AM To: "Gerald Britton"<gerald.britton(a)gmail.com>; Cc: "Python-Ideas"<python-ideas(a)python.org>; Subject: Re: [Python-ideas] clear() method for lists On Fri, Feb 5, 2010 at 1:39 PM, Gerald Britton <gerald.britton(a)gmail.com> wrote: > In the list archives, … [View More]

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itertools has starmap but no starreduce?
by Andrey Fedorov Feb. 12, 2010

Feb. 12, 2010

Is that right, or am I missing something obvious?

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clear() method for lists
by Gerald Britton Feb. 8, 2010

Feb. 8, 2010

In the list archives, this thread http://mail.python.org/pipermail/python-ideas/2009-April/003897.html discusses adding a clear() method to list objects, to complement those available for sets and dictionaries. Later in the thread: http://mail.python.org/pipermail/python-ideas/2009-April/003933.html Christian Heimes provided a patch to do it and R. H. commented that all it would take is Guido's blessing. So, I'm wondering, can we do this? What are the steps needed to ask this … [View More]

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Re: [Python-ideas] [Python-Dev] Proposal for the getpass module
by Tarek Ziadé Feb. 7, 2010

Feb. 7, 2010

2010/2/7 Lennart Regebro <regebro(a)gmail.com>: [..] > > Having getpass calling the keyring module seems backwards to me. It > should rather be the keyring module that calls getpass, if needed. I think you are right, the getpass module should be considered as one way to get a password. Regards, Tarek -- Tarek Ziadé | http://ziade.org

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Re: [Python-ideas] [Python-Dev] Proposal for the getpass module
by Guido van Rossum Feb. 7, 2010

Feb. 7, 2010

[redirecting to python-ideas] On Sat, Feb 6, 2010 at 4:08 PM, Tarek Ziadé <ziade.tarek(a)gmail.com> wrote: > Hello, > > I would like to propose a small change in the getpass module so it's > able to get passwords from keyrings (like KWallet, Keychain, etc) > > The idea is to provide a getpass.cfg configuration file where people > can provide the name of a function to use when getpass is called. > Then third-party projects can implement this function. For example … [View More]

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