python里的双下划线函数都是什么意思？

Question

__module__
__new__
__reduce__
__repr__
__reduce_ex__
__getattribute__

Answer 1

Look here

Answer 2

http://rafekettler.com/magicmethods.html

Answer 3

Hide attributes or methods.

such as

>>> '33'.__hash__()
4038753864587545164
>>> '33'.__len__()==len('33')
True


>>> (3).__pow__(2)
9

>>> int.__pow__(3,2)
9

Answer 4

Simply put, it’s a hook.