不借用其他变量交换两个数字python经典面试

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a = 4
b = 6
print(a, b)
# 交换两个变量
a = a + b
b = a - b
a = a - b
print(a, b)```
方法二
 python 专有——元组
 

```python
a=4
b=6
a,b=(b,a)
print(a,b)```