Python那些优雅的写法：switch-case

摘自：https://www.jianshu.com/p/e4d3cb75e532

Python那些优雅的写法：switch-case

引言

实际上Python是没有所谓的switch case写法的，熟悉C艹和Java的同学可能已经习惯了用switch case结构去优雅的处理一些事情，比如这样：

switch(变量){ case 变量值1: //...; break; case 变量值2: //...; break; ... case default: //...; break; } 

但是在Python中，官方对switch case的需求是这样回复的：
" You can do this easily enough with a sequence of if... elif... elif... else. There have been some proposals for switch statement syntax, but there is no consensus (yet) on whether and how to do range tests. "
感觉有点low。

解决

可用字典方法解决这个问题：

# switch = {"valueA":functionA,"valueB":functionB,"valueC":functionC} # try: #　　switch["value"]() #执行相应的方法。 # except KeyError as e: # pass 或 functionX #执行default部分 switch = { "a":lambda x:x*2, "b":lambda x:x*3, "c":lambda x:x**x } try: swtich["c"](6) except KeyError as e: pass