[docs] [issue10994] implementation details in sys module

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

The __sizeof__ special attribute shows up in dir(object) but appears not to be documented other than with

>>> help(object.__sizeof__)
Help on method_descriptor:
__sizeof__(...)
    __sizeof__() -> size of object in memory, in bytes

Should it have an entry in Lib 4.12. Special Attributes?

object.__sizeof__
    A method used by sys.getsizeof.

It should then show up in the index (missing now) and point people to sys.getsizeof.  Looking further, I see that it is mentioned but not indexed in the sys.getsizeof entry.

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nosy: +terry.reedy

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<http://bugs.python.org/issue10994>
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