Python－if-elif-else语句

Source:

#!/bin/env python # coding=gb2312 # -*- coding: gb2312 -*- from __future__ import division #### if-else #### print '#### if-else ####' a = input("a: ") # 12 or 10+2 b = input("b: ") if(a>b): print "max: ", a else: print "max: ", b #### if-elif-else #### print '#### if-elif-else ####' score = raw_input("score: ") # string score = int(score) if(score>=90) and (score<=100): print "A" elif(score>=80 and score<90): print "B" elif(score>=60 and score<80): print "C" else: print "D" #### switch I #### print '#### switch ####' x = 1 y = 2 operator = "/" result = { "+": x+y, "-": x-y, "*": x*y, "/": x/y } print result.get(operator) #### switch II #### print '#### switch II ####' class switch(object): def __init__(self, value): # init value self.value = value self.fall = False # no break, then fall=False def __iter__(self): yield self.match # match method to create raise StopIteration # exception to check loop def match(self, *args): if self.fall or not args: return True elif self.value in args: # successful self.fall = True return True else: # fail return False operator = "+" x = 1 y = 2 for case in switch(operator): if case('+'): print x+y break if case('-'): print x-y break if case('*'): print x*y break if case('/'): print x/y break if case(): print 'NULL'  

Result:

 

[work@db-testing-com06-vm3.db01.baidu.com python]$ python if_else.py 

#### if-else ####

a: 12 + 8

b: 30

max:  30

#### if-elif-else ####

score: 88

B

#### switch ####

0.5

#### switch II ####

3

 

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中文注释参考：

 

一个极小的问题。在python代码中，用了中文注释，不能被python解释器理解(python 2.5)。解决方案是:

# coding=gb2312
print 'ok' #中文注释没问题

或者:

# -*- coding: gb2312 -*-
print 'ok'  #这样也行

 

 

代码详解参考：

http://blog.csdn.net/Lynn_yan/archive/2010/04/08/5464911.aspx