[1,3]
[]
[2,4]
[1,2,3,4]
a = [1, 2, 3, 4] for i in a: a.remove(i) print(i) print(a) print(a)
a = [1, 2, 3, 4] for i in a: print(a.index(i)) a.remove(i) print(a)
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