Python更改数组中的元素 [英] Python change element in array

问题描述

如何更改数组中的元素?我有此代码，但我希望它会显示 [[5,5]，[1,4]] .但事实并非如此.仍然会打印 [[1,2 ,, [1,4]] .

How I can change element in array? I have this code, but I expected that it would print [[5,5],[1,4]]. But it wouldn't. It still prints [[1,2],[1,4]].

x = [[1,2], [1,4]]
for element in x:
    if element[1] == 2:
        element = [5,5]
print x

推荐答案

更改列表元素需要索引.

Change a list element requires an index.

list_object[index] = new_value

使用 枚举 ，您可以遍历列表并获取索引.

Using enumerate, you can iterate the list and get a indexes.

>>> x = [[1,2], [1,4]]
>>> for i, element in enumerate(x):
...     if element[1] == 2:
...         x[i] = [5,5]
...
>>> x
[[5, 5], [1, 4]]

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