python利用dict模拟switch

#方法1
def add(x,y):
    return x+y

def dec(x,y):
    return x-y

def multi(x,y):
    return x*y

def div(x,y):
    return x/y

operater = {‘+‘:add,‘-‘:dec,‘*‘:multi,‘/‘:div}
def calculator(x,o,y):
    return operater.get(o)(x,y)

#方法2
def calculator1(x,o,y):
    return {‘+‘:x+y,‘-‘:x-y,‘*‘:x*y,‘/‘:x/y}.get(o)

def test():
    print calculator(2, ‘*‘, 6)
    print calculator1(2,‘+‘,6)
if __name__ == "__main__":
    test()