raw_input,if-elif-else,while

raw_input

1 print "hello world"
2 
3 name=raw_input("what is your name? ")
4 print "hello ["+name +"] !"
5 
6 raw_input("press <enter> to close")

 

raw_input 过滤空值 

 1 name=''
 2 while not name or name.isspace():
 3     name=raw_input('type in your name: ') 
 4 if name=='a':
 5     print "a"
 6 elif name=='b':
 7     # none
 8     pass
 9 elif name=='c':
10     print 'ok'  
13 print("-----------------------") 
15 raw_input("enter to exit ")
 1 age= input('input your age ')
 2 print("you are "+str(age))
 3 if age<=30:
 4     print("you are younger than me")
 5 elif 31<=age<=50:
 6     print("between 31 and 50")
 7 else:
 8   print("you are older enough")
 9  
10 print("done")

 

for

 1 words=['one','two','three']
 2 for word in words:
 3     print word
 4 print "-----------------------------"
 5 
 6 #到下标但不包含
 7 for number in range(1,5):
 8     print number
 9 
10 print "-----------------------------"
11 #输出为
12 1
13 2
14 3
15 4

 

while 注意使用时避免死循环

 1 x=1
 2 while x<=3:
 3     print x
 4     x+=1
 5 
 6 print 'done'
 7 
 8 
 9 name=''
10 while not name or name.isspace():
11     name=raw_input('type in your name: ')
12 print 'hello . %s ' % name  
1 #始终打印用户输入的值 只到什么也不输入了
2 print "------------while true-----------"
3 
4 while True:
5     word=raw_input('type in one word: ')
6     if not word:break
7     print 'The word is '+word

 

 

posted @ 2013-12-11 14:05  zhangxiaodel  阅读(315)  评论(0)  编辑  收藏  举报