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nad2000/mutable.py

Created July 29, 2018 11:21
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mutable.py
visited = [[False] * m] * n
visited
=> [[False, False, False, False], [False, False, False, False], [False, False, False, False]]
visited[0]
=> [False, False, False, False]
visited[0][0]
=> False
visited[0][0] = True
visited
=> [[True, False, False, False], [True, False, False, False], [True, False, False, False]]
visited = [[0] * m] * n
visited
=> [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
visited[0][0] =1
visited
=> [[1, 0, 0, 0], [1, 0, 0, 0], [1, 0, 0, 0]]
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