python中沒有switch語法,但是可以用字段的方式來實現,代碼如下:
**注:**python中用if語句也可以來實現switch,但是效率較低,要經過多次if判斷
#!/usr/bin/python
#coding:utf8
from __future__ import division
def add(x, y):
return x+y
def minus(x, y):
return x-y
def multiply(x, y):
return x*y
def divide(x, y):
if y == 0:
return "error"
else :
return x/y
#add, minus, multiply, divide在這裏都是函數對象
operator = {"+":add, "-":minus, "*":multiply, "/":divide}
def f(x, o, y):
print operator.get(o)(x, y)
f(10, '+', 12)
f(10, '-', 12)
f(10, '*', 12)
f(10, '/', 12)
#在python中這樣是可以的, add是上面定義的加法函數
a = add
print "1+2 = ", a(1, 2), "; 1+2 = ", add(1, 2)
結果輸出:
22
-2
120
0.833333333333
1+2 = 3 ; 1+2 = 3