引言

實(shí)際上Python是沒有所謂的switch case寫法的，熟悉C艸和Java的同學(xué)可能已經(jīng)習(xí)慣了用switch case結(jié)構(gòu)去優(yōu)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(duì)switch case的需求是這樣回復(fù)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(diǎn)low。

解決

可用字典方法解決這個(gè)問題：

# switch = {"valueA":functionA,"valueB":functionB,"valueC":functionC}
# try:
#　　switch["value"]() #執(zhí)行相應(yīng)的方法。
# except KeyError as e:
#       pass 或 functionX #執(zhí)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