a, b = b, a
# 在python中，会在过程中生成一个元组 c，并且c = (b ,a)，
# 然后进行a = c[0] ， b = c[1] 的操作
# with语句适用于对资源访问的场景，确保不管使用过程中是否发生异常都会执行必要的“清理”
# 自定义上下文管理器来对软件系统中的资源进行管理, 比如数据库连接、共享资源的访问控制
然后看stack overflow上的第一个回答就知道了。
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