Python variable exchange
The following examples are two variables input by a user, and exchange:
# -*- coding: UTF-8 -*-
# Filename : test.py
# author by : www.w3big.com
# 用户输入
x = input('输入 x 值: ')
y = input('输入 y 值: ')
# 创建临时变量，并交换
temp = x
x = y
y = temp
print('交换后 x 的值为: {}'.format(x))
print('交换后 y 的值为: {}'.format(y))
Execute the above code output results:
输入 x 值: 2 输入 y 值: 3 交换后 x 的值为: 3 交换后 y 的值为: 2
The above example, we created a temporary variable temp, the temp variable, then assign the value of y and x values are stored x, y finally temp assignment to a variable.
Do not use temporary variables
We can not create a temporary variable, with a very elegant way to exchange variables:
x,y = y,x
So the above example would be modified as follows:
# -*- coding: UTF-8 -*-
# Filename : test.py
# author by : www.w3big.com
# 用户输入
x = input('输入 x 值: ')
y = input('输入 y 值: ')
# 不使用临时变量
x,y = y,x
print('交换后 x 的值为: {}'.format(x))
print('交换后 y 的值为: {}'.format(y))
Execute the above code output results:
输入 x 值: 1 输入 y 值: 2 交换后 x 的值为: 2 交换后 y 的值为: 1