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When initializing a class with an empty dict() object as a default initializer, if it is not overridden, multiple instances of the class will share the dictionary. IE:
class test(object):
 def __init__(self, obj=dict()):
 self.obj = obj
a = test()
b = test()
Then id(a.obj) points to the same location as id(b.obj). The behaviour I would expect would be that a.obj and b.obj would be unique instances.