mutators

Python property descriptor design: why copy rather than mutate? Question: I was looking at how Python implements the property descriptor internally. According to the docs property() is implemented in terms of the descriptor protocol, reproducing it here for convenience: class Property(object): “Emulate PyProperty_Type() in Objects/descrobject.c” def __init__(self, fget=None, fset=None, fdel=None, doc=None): self.fget = fget self.fset …

Appending turns my list to NoneType Question: In Python Shell, I entered: aList = [‘a’, ‘b’, ‘c’, ‘d’] for i in aList: print(i) and got a b c d but when I tried: aList = [‘a’, ‘b’, ‘c’, ‘d’] aList = aList.append(‘e’) for i in aList: print(i) and got Traceback (most recent call last): File …