Module name does not match file name
Robert Kern
robert.kern at gmail.com
Mon Jul 7 07:15:51 EDT 2014
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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