[docs] [issue15436] __sizeof__ is not documented

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

sys.getsizeof() is not for production code, it's for experimenting and getting information at the command prompt. It's quite useful when you know its limitations.

I'd argue that implementing __sizeof__ for user types doesn't make much sense (except C extension types, which are CPython-specific).

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nosy: +pitrou

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