a = [[]]*3
a[0].append(1)
>>a = [[1], [1], [1]]
a = []
for i in range(3):
a.append([])
>>a = [[], [], []]
a[0].append(1)
>>a = [[1], [], []]
Python中list.append()可能出现的问题
a = [[]]*3
a[0].append(1)
>>a = [[1], [1], [1]]
a = []
for i in range(3):
a.append([])
>>a = [[], [], []]
a[0].append(1)
>>a = [[1], [], []]
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