[docs] [issue14003] __self__ on built-in functions is not as documented

[eryksun]

eryksun added the comment:

In Python 2 [Py_InitModule4][1] optionally allows setting __self__ on module functions, but no module in the standard library actually uses this. It's always None. This is no longer optional with Python 3's [PyModule_Create][2]. Built-in module functions instantiated the normal way can be considered as methods of the module in which they're defined. However, some modules may specially instantiate functions for which __self__ is None, such as codecs.strict_errors.

    >>> codecs.strict_errors.__self__ is None
    True

[1]: https://docs.python.org/2/c-api/allocation.html#c.Py_InitModule4
[2]: https://docs.python.org/3/c-api/module.html#c.PyModule_Create

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nosy: +eryksun

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<http://bugs.python.org/issue14003>
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