【python之路3】if 语句

1、if语句用法（if....else....）

#!/usr/bin/env python
# -*- coding:utf-8 -*-
my_name = raw_input("please put username:")
my_pass = raw_input("please put password:")
if my_name == "abc" and my_pass == '123':
    print '登陆成功！'
else:
    print '登陆失败！'

2、if.....elif.....elif......else

#!/usr/bin/env python
# -*- coding:utf-8 -*-
st = raw_input("please enter a number:")
if st == '1':
    print 'you enter num1'
elif st == '2':
    print 'you enter num2'
elif st == '3':
    print 'you enter num3'
else:
    print 'you enter a unkown num'