不同於C語言和SHELL，python中沒有switch case語句，關於為什麼沒有，官方的解釋是這樣的

使用Python模擬實現的方法：

程式碼示例：

def switch_if(fun, x, y):

if fun == "add":

return x + y

elif fun == "sub":

return x - y

elif fun == "mul":

return x * y

elif fun == "div":

return x / y

else:

return None

def switch_dict(fun, x, y):

return {

"add": lambda: x + y,

"sub": lambda: x - y,

"mul": lambda: x * y,

"div": lambda: x / y,

}.get(fun,None)()

print("switch_if("add",1,2):",switch_if("add",1,2))

print("switch_if("sub",1,2):",switch_if("sub",1,2))

print("switch_if("mul",1,2):",switch_if("mul",1,2))

print("switch_if("div",1,2):",switch_if("div",1,2))

print("switch_dict("add",1,2):",switch_dict("add",1,2))

print("switch_dict("sub",1,2):",switch_dict("sub",1,2))

print("switch_dict("mul",1,2):",switch_dict("mul",1,2))

print("switch_dict("div",1,2):",switch_dict("div",1,2))

switch_if("add",1,2): 3

switch_if("sub",1,2): -1

switch_if("mul",1,2): 2

switch_if("div",1,2): 0.5

switch_dict("add",1,2): 3

switch_dict("sub",1,2): -1

switch_dict("mul",1,2): 2

switch_dict("div",1,2): 0.5