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Re: Module name does not match file name

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From Robert Kern <robert.kern@gmail.com>
Subject Re: Module name does not match file name
Date Mon, 07 Jul 2014 12:15:51 +0100
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On 2014-07-07 09:57, Steven D'Aprano wrote:
> Ah, I think I have a partial answer... but not a complete answer.
>
>
> On Mon, 07 Jul 2014 07:57:21 +0000, Steven D'Aprano wrote:
>
>> Can anyone explain how "import pg" can end up coming from pgmodule.so?
>>
>>
>> Sure enough:
>>
>>>>> import pg
>>>>> pg.__file__
>> '/usr/local/lib/python2.6/dist-packages/pgmodule.so'
>
>
>
> I've looked inside the pgmodule.c source code, and it includes this
> snippet:
>
>
> extern void
> initpg(void)
> {
>      char *p;
>      int i;
>
>      Py_InitModule("pg", pg_methods);
>
>
> which suggests that the pgmodule.so file creates a module called "pg".
> What I don't understand is how "import pg" gets turned into "run
> pgmodule.so"?

This has been standard Python behavior for extension modules since forever. It's 
a very old practice and not recommended for new code, though.

[~]
|1> import imp

[~]
|2> imp.get_suffixes()
[('.so', 'rb', 3), ('module.so', 'rb', 3), ('.py', 'U', 1), ('.pyc', 'rb', 2)]

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco

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Thread

Module name does not match file name Steven D'Aprano <steve@pearwood.info> - 2014-07-07 07:57 +0000
  Re: Module name does not match file name Chris Angelico <rosuav@gmail.com> - 2014-07-07 18:04 +1000
    Re: Module name does not match file name Steven D'Aprano <steve@pearwood.info> - 2014-07-07 09:03 +0000
      Re: Module name does not match file name Chris Angelico <rosuav@gmail.com> - 2014-07-07 19:11 +1000
  Re: Module name does not match file name Steven D'Aprano <steve@pearwood.info> - 2014-07-07 08:57 +0000
    Re: Module name does not match file name Chris Angelico <rosuav@gmail.com> - 2014-07-07 19:03 +1000
      Re: Module name does not match file name Steven D'Aprano <steve@pearwood.info> - 2014-07-07 09:28 +0000
    Re: Module name does not match file name Peter Otten <__peter__@web.de> - 2014-07-07 12:41 +0200
    Re: Module name does not match file name Robert Kern <robert.kern@gmail.com> - 2014-07-07 12:15 +0100
      Re: Module name does not match file name Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-07-07 11:56 +0000
        Re: Module name does not match file name Chris Angelico <rosuav@gmail.com> - 2014-07-07 22:04 +1000
        Re: Module name does not match file name Robert Kern <robert.kern@gmail.com> - 2014-07-07 15:25 +0100

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