[英]Python prints memory addresses of nested lists rather than list contents
我希望此代碼按照[[7, 4, 1], [8, 5, 2], [9, 6, 3]]
打印內容,而不是打印:
[<map object at 0x7f8c1f578e10>, <map object at 0x7f8c1f578ef0>, <map object at 0x7f8c1f578fd0>]
#!/usr/bin/env python3
def transpose(matrix):
results = [None] * len(matrix)
for subIndex in range(len(matrix)):
results[subIndex] = map((lambda sub : sub[subIndex]), matrix)
return results
def rotateClockwise(matrix2):
reversedmatrix = list(reversed(matrix2))
rotated = transpose(reversedmatrix)
return rotated
def main():
m = [[1,2,3],[4,5,6],[7,8,9]]
output = rotateClockwise(m)
return output
if __name__ == "__main__":
x = main()
print(x)
為什么是這樣? 我該如何解決?
map
函數不返回列表。 它返回地圖對象。
您可以刪除map
函數以實現列表理解,這在python中是首選的。
更改此行:
results[subIndex] = map((lambda sub : sub[subIndex]), matrix)
為了這:
results[subIndex] = [sub[subIndex] for sub in matrix]
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