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'