法一：

#!/usr/bin/env python

#_*_ coding:utf-8 _*_

for i in range(0,10,2): #步长值为2

  print("loop",i)

法二：

#!/usr/bin/env python

#_*_ coding:utf-8 _*_

for i in range(0,10):

  if i < 3 :

    print("loop",i)

  else:

    continue #终止小循环

  print("hehe...")

法三：

#!/usr/bin/env python

# -*- coding: utf-8 -*-

age_of_jack = 23

for i in range(3):

  guess_age = int(input('guess age:'))

  if guess_age == age_of_jack:

    print('yes,you got it.')

    break

  elif guess_age > age_of_jack:

    print('think smaller...')

  else:

    print('think bigger!')

else:

  print('you have tried too many times,fuck off')

法四：

#!/usr/bin/env python

#_*_ coding:utf-8 _*_

for i in range(10):

  print('----',i)

  for j in range(10):

    print(j)