【相关学习推荐：python教程】

python中的分支有三种形式，分别是：

1、if

#!/usr/bin/envpython
#-*-coding:utf-8-*-
user=input('Pleaseinputyourusername:')
ifuser=='admin':5print('Nice')

2、if ... else ...

#!/usr/bin/envpython
#-*-coding:utf-8-*-
user=input('Pleaseinputyourusername:')
pass=input('Pleaseinputyourpassword:')
ifuser=='admin'andpass=='123456':
print('Good')
else:
print('Bad')

3、if ... elif ... else ...

#!/usr/bin/envpython
#-*-coding:utf-8-*-
grade=(prompt='Pleaseinputyourgrade')
ifgrade>=85:
print('Great')
elifgarde<85andgrade>=70:
print('Good')
elsegrade<70:
print('Bad')