Check out this toy example that demonstrates some "strange" behaviour
with keyword arguments and inheritance.
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class Parent:
def __init__(self, ary = []):
self.ary = ary
def append(self):
self.ary.append(1)
class Child(Parent):
def __init__(self):
Parent.__init__(self)
self.append()
def main():
a = Child()
print a.ary
b = Child()
print b.ary
main()
=====================================
You would think the output of this program would be [1], [1]. But
strangely enough the output is [1,], [1,1]. I suppose that the
Parent.__class__ object is only created once and thus the keyword
argument always refers to the same thing, but I don't know. I have a
very rudimentary understading of python's guts, but I would still call
the behaviour unexpected. Or perhaps I should rtfm?
Any thoughts would be much appreciated. Thanks.
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