Python a, b = b, a +b [Python3常见问题]

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参考文档

阅读文档发现的。

>>> # Fibonacci series:
... # the sum of two elements defines the next
... a, b = 0, 1
>>> while b < 10:
...     print(b)
...     a, b = b, a+b
...
1
1
2
3
5
8

他实际上就是：

c = a + b
a = b
b = c

其他应用

1. 交换

a, b = 0, 1
a, b = b, a

评价：省去了temp中间变量

2. 斐波那契

>>> a, b = 0, 1
>>> while b < 1000:
...     print(b, end=',')
...     a, b = b, a+b
...
1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,

评价：比起数组的，递归的，确实简洁