Steven D'Aprano <steve at REMOVETHIScyber.com.au> writes: > Imagine that ints could be changed in place. Then you could do this: > > x = 0 > x += 1 No nothing like that. Nothing stops you from having multiple int objects with the same value. Lists, for example, are mutable, but x = [0,1] x += [2,3] doesn't change what the literal [0,1] means.