Christian Heimes added the comment:

In fact it is a built-in method without a doc string:

>>> f = open("/dev/null")
>>> f.close
<built-in method close of _io.TextIOWrapper object at 0x7feefaab42f0>
>>> f.close.__doc__

All functions and methods that are implemented in C are referred to as built-in 
functions. It's an implementation detail.

----------
nosy: +christian.heimes
priority: normal -> low
type:  -> behavior
versions: +Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18249>
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