how to determine for using c extension or not ?

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Hello everyone.

I use bisect module.
bisect module developer give us c extension as _bisect.

If Python3.3 use _bisect, _bisect override his functions in bisect.py.

now, I use id() function to determine for using c extension or not.

>>> import bisect
>>> id(bisect.bisect)
139679893708880
>>> import _bisect
>>> id(_bisect.bisect)
139679893708880

they return 139679893708880 as id.
so i believe that i use c extension.

My check is correct ? right ?
or you have more good idea ?

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how to determine for using c extension or not ? umedoblock <umedoblock@gmail.com> - 2015-08-03 14:47 +0900
  Re: how to determine for using c extension or not ? Steven D'Aprano <steve@pearwood.info> - 2015-08-03 23:36 +1000
    Re: how to determine for using c extension or not ? umedoblock <umedoblock@gmail.com> - 2015-08-03 23:01 +0900
    Re: how to determine for using c extension or not ? Joel Goldstick <joel.goldstick@gmail.com> - 2015-08-03 10:11 -0400
    Re: how to determine for using c extension or not ? umedoblock <umedoblock@gmail.com> - 2015-08-03 23:57 +0900
    Re: how to determine for using c extension or not ? Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2015-08-03 15:05 +0000
    Re: how to determine for using c extension or not ? umedoblock <umedoblock@gmail.com> - 2015-08-04 22:59 +0900

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