Eric Snow added the comment:
FYI, __new__() is a staticmethod to accommodate subclassing. Several things
that happen at instantiation-time (when __new__() is called), including memory
allocation, are tied to the class that is passed in and may be different for
subclasses. For example:
class Spam(int):
def __new__(cls, value):
self = super().__new__(Spam, value)
self._eggs = 10
return self
Spam is passed in instead of int (as would happen if it were a classmethod),
resulting in extra memory being allocated for _eggs (and for __dict__ among
other things).
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nosy: +eric.snow
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<http://bugs.python.org/issue21415>
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