Steve D'Aprano wrote:
py> class K: # defines an object ... def __init__(self, x): ... self.x = x ... def append(self, value): ... self.x.append(value) ... py> a = [] py> b = K(a) py> a is b # these are not the same object (they're different types) False py> b.append(99) # but modifying b modifies a py> a [99]
You didn't mutate the object bound to b there, you mutated the one bound to b.x, which is also bound to a. All you've shown is that just because a method is named "append" doesn't mean it mutates the object it's a method of. :-) -- Greg -- https://mail.python.org/mailman/listinfo/python-list
