摘自:https://www.jianshu.com/p/e4d3cb75e532
Python那些優雅的寫法:switch-case
引言
實際上Python是沒有所謂的switch case
寫法的,熟悉C艹和Java的同學可能已經習慣了用switch case
結構去優雅的處理一些事情,比如這樣:
switch(變量){ case 變量值1: //...; break; case 變量值2: //...; break; ... case default: //...; break; }
但是在Python中,官方對switch case
的需求是這樣回復的:
" 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. "
感覺有點low。
解決
可用字典方法解決這個問題:
# switch = {"valueA":functionA,"valueB":functionB,"valueC":functionC} # try: # switch["value"]() #執行相應的方法。 # except KeyError as e: # pass 或 functionX #執行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