1 a, b = 3, 4
2 c, d = 3, 4
3  
4 a, b = b, a + b
5 c = d
6 d = c + d
7 print(a, b, c, d)

输出:

4 7 4 8

因为a, b和b, a + b都是元祖(tuple)

先计算(b, a + b)的元祖为(4, 7)然后将该元祖赋值给(a, b)

其等于以下代码:

1 a, b = 3, 4
2 c = (b, a + b)
3 a, b = c

输出:

4 7 4 8

因为a, b和b, a + b都是元祖(tuple)

先计算(b, a + b)的元祖为(4, 7)然后将该元祖赋值给(a, b)

其等于以下代码:

1 a, b = 3, 4
2 c = (b, a + b)
3 a, b = c

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