python中的分支有几种形式

#!/usr/bin/env python

 #-*- coding:utf-8 -*-

user=input('Please input your username : ')

if user=='admin':5     print('Nice')

#!/usr/bin/env python

 #-*- coding:utf-8 -*-

 user=input('Please input your username : ')

 pass=input('Please input your password: ')

 if user=='admin' and pass=='123456':

     print('Good')

 else:

     print('Bad')

#!/usr/bin/env python

 #-*- coding:utf-8 -*-

grade=(prompt='Please input your grade')

if grade>=85:

    print('Great')

elif garde<85 and grade>=70:

    print('Good')

else grade<70:

    print('Bad')