list1 = list2 = []
のように初期化してしまうと、参照をコピーしてしまう。
慌てず焦らず
list1 = []
list2 = []
のようにする必要がある
test.py
>>> list1 = list2 = []
>>> list1.append(1)
>>> list2.append(2)
>>> print list1
[1, 2]
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