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並前往https://codereview.stackexchange.com/questions/127458/effective-python-2-3-two-dimensional-array-initialisation

Effective Python 2/3 two-dimensional array initialisation

First off don't use multiplication . It's creates 2 lists, not 7001. To better show this, hop into IDLE: >>> a = [[0] * 3] * 3 >>> a [[0, 0, ...

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