1、单条件流程控制
If：
else：
2、多条件的流程控制
If xxx:
print yyy4
elif xxxx：
print yyy3
elif：
print yyy2
else：
print yyy1
eg：修改ex1.py
#!/usr/bin/env python
# _*_ coding = utf-8 _*_
import getpass
name = raw_input('please inputyour username:')
pwd = getpass.getpass('inputyour password:')
print 'the name is:',name
print 'the password is:',pwd
if name == 'huwei' and pwd =='huwei123':
print 'you login successfully!,welcomehuwei,normal user'
elif name == 'tony' and pwd =='123':
print 'you login successfully!,welcometony,super user'
elif name == 'humin' and pwd =='123':
print 'you login successfully!,welcomehumin,superhero user'
else:
print 'your password is wrong!'
执行结果：
[root@localhost~]# python ex1.py
please input yourusername:huwei
input yourpassword:
the name is:huwei
the password is:huwei123
you loginsuccessfully!,welcome huwei,normal user
[root@localhost~]# python ex1.py
please input yourusername:humin
input yourpassword:
the name is:humin
the password is:123
you loginsuccessfully!,welcome humin,superhero user
[root@localhost~]# vi ex1.py
[root@localhost~]# python ex1.py
please input yourusername:tony
input yourpassword:
the name is: tony
the password is:123
you loginsuccessfully!,welcome tony,super user
[root@localhost~]#
eg：
变种ex1.py：
import getpass
name = raw_input('please inputyour username:')
pwd =getpass.getpass('password:')
if pwd == '123':
if name == 'tony':
print 'tony,normal'
elif name == 'huwei':
print 'huwei,super'
elif name == 'humin':
print 'humin,superhero'
else:
print 'password is wrong!'
else:
print 'password is wrong!'
执行结果：
[root@localhost~]# python ex1.py
please input yourusername:huwei
input yourpassword:
the name is:huwei
the password is:huwei123
you loginsuccessfully!,welcome huwei,normal user
[root@localhost~]# python ex1.py
please input yourusername:humin
input yourpassword:
the name is:humin
the password is:123
you loginsuccessfully!,welcome humin,superhero user
[root@localhost~]# vi ex1.py
[root@localhost~]# python ex1.py
please input yourusername:tony
input yourpassword:
the name is: tony
the password is:123
you loginsuccessfully!,welcome tony,super user
[root@localhost~]#
注：
1.冒号是条件控制的结束
2.同级缩进要一致：IndentationError2
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