[Python-ideas] making a module callable

[Nick Coghlan]

On 20 Nov 2013 08:06, "Mathias Panzenböck" <grosser.meister.morti at gmx.net>
wrote:
>
> Maybe the solution would be to make it possible to "return" something
else than a module object, similar to how node.js does it?

Already supported, modules just have to replace themselves with an instance
of a custom class in sys.modules.

PEP 451 makes it even easier to write custom finders and loaders that
return custom module types.

Cheers,
Nick.

>
> In node.js:
>
> callme.js:
> module.exports = function (a) { console.log("a:",a); };
>
> > require("./callme.js")("b")
> a: b
> undefined
> >
>
> Possible way to do it in Python *already*:
>
> callme.py:
> import sys
> sys.modules[__name__] = lambda a: print("a:",a)
>
> >>> import callme
> >>> callme('b')
> a: b
> >>>
>
>
> Maybe not very nice, but is there a reason why not to do this (except for
it's ugliness)?
>
>
>
> On 11/19/2013 10:39 PM, Haoyi Li wrote:
>>
>>  > there are some modules who just have one single main use (pprint) and
could profit from that.
>>
>> A milion times this!
>>
>> pprint.pprint()
>> time.time()
>> random.random()
>> copy.copy()
>> md5.md5()
>> timeit.timeit()
>> glob.glob()
>> cStringIO.cStringIO()
>> StringIO.StringIO()
>>
>>
>>
>> On Tue, Nov 19, 2013 at 1:01 PM, Philipp A. <flying-sheep at web.de <mailto:
flying-sheep at web.de>> wrote:
>>
>>     2013/11/19 Michael Foord <fuzzyman at gmail.com <mailto:
fuzzyman at gmail.com>>
>>
>>
>>         On 19 November 2013 18:09, Philipp A. <flying-sheep at web.de<mailto:
flying-sheep at web.de>> wrote:
>>
>>             imho it would simplify the situation. currently, everything
is callable that has a |__call__| property which
>>             is itself callable:
>>
>>         This is why module objects are not callable even if they have a
__call__. They are *instances* of ModuleType and
>>         the __call__ method is looked up on their type, not the instance
itself. So modules not being callable even when
>>         they a __call__ is not an anomaly, even if it is not convenient
sometimes.
>>
>>     you’re right, apologies. so the hack consists of switching a
module’s class during runtime…
>>
>>     there’s also another hack, calldules <
https://pypi.python.org/pypi/calldules>, making that automatic (funnily via
>>     implicits effects when doing |import calldules|). note that it isn’t
serious! just a programming exercise.
>>
>>
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>>
>>
>>
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