2、循环判断

IF 判断

FOR循环

for i in range(1,5):
        print i

for i in range(5):
        print i

用变量控制循环次数：

1. #!/usr/bin/python
   list=[‘lk‘,‘tom‘,‘jack‘]
   a=4
   for name in range(1,a):
           print name

小练习：for和if结合用

1. [[email protected] python_scripts]# cat 4for.py
   #!/usr/bin/python
   list=[‘lk‘,‘tom‘,‘jack‘]
   for name in list:
           if name==‘lk‘:
                   print name,‘ is very good!‘
           else:
                   print name
   print ‘loop over!‘
   
   [[email protected] python_scripts]# python 4for.py
   lk  is very good!
   tom
   jack
   loop over!

WHILE循环

1. [[email protected] python_scripts]# cat 5while.py
   #!/usr/bin/python
   whileTrue:
           input=raw_input(‘(alive|dead|other):‘)
           if input==‘alive‘:
                   print ‘The process is ‘,input
           else:
                   print ‘The process is ‘,input
                   break