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x,y有何作用？

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泽林--安静读书

#1 Created at ... [Delete] [Delete and Lock User]

iter complex list:

print('iter [(1, 1), (2, 4), (3, 9)]:') for x, y in [(1, 1), (2, 4), (3, 9)]: print(x, y)

直接用： for x in [(1, 1), (2, 4), (3, 9)]: print(x) 也可以。

那第一种方法用x,y有何作用？

Cod1ng

#2 Created at ... [Delete] [Delete and Lock User]

第二种方法取出的是元组，而第一种方法可以把元祖里面的几个值给取出来

廖雪峰

#3 Created at ... [Delete] [Delete and Lock User]

正常情况下你这么写：

for t in [(1, 1), (2, 4), (3, 9)]:
    x = t[0]
    y = t[1]
    print(x + y)

现在改成这样代码不是更少吗？

for x, y in [(1, 1), (2, 4), (3, 9)]:
    print(x + y)
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