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python中for循环的几个现象

pipu 2024-01-31 阅读 13
python
1.  

运行如下代码

l = [{}, {}, {}]
for k in l:
    k[1] = 1
print(l)

输出为

[{1: 1}, {1: 1}, {1: 1}]
2.

运行如下代码

l = [{}, {}, {}]
for k in l:
    k = {1:1}
print(l)

输出为

[{}, {}, {}]
3.

运行如下代码

l = [1,2,3]
for k in l:
    k = k * 2
print(l)

输出为

[1, 2, 3]
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