Python学习 - 面试题：交换两个数字

# coding: utf-8

# 面试题：交换两个数字
a = 6
b = 100

# solution 1
# c = a
# a = b
# b = c


# solution 2

# a = a + b
# b = a - b
# a = a - b


# solution 3

a, b = b, a

print a, b