Weird side effect of default parameter
Robert Latest
boblatest at yahoo.com
Thu May 3 15:47:37 EDT 2018
Hello,
I don't understand the behavior of the code below. Why does the dict property
"a" of both objects contain the same keys? This is only if "a=dict" is in
the initializer. If I put self.a = dict() into the init function, I get two
separate dicts
class Foo(object):
def __init__(self, x, a=dict()):
self.x = x
self.a = a
self.a[x] = x
c = Foo(1)
d = Foo(2)
print(c.__dict__)
print(d.__dict__)
robert
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