pass :不做任何事情，只起到占位的作用

continue: 跳出本次循环

break：结束循环

exit（）：结束整个程序

由于continue和break较简单，这里就不给出代码：

1 #!/use/bin/python
  2 
  3 for element in "Python":
  4     if element == "y":
  5         pass
  6     else:
  7         print element
  8 
  9 print "#" * 10
 10 
 11 for element in "Python":
 12     if element == "t":
 13         exit()
 14     else:
 15         print element
 16 
 17 print "#" * 10
 18 for element in range(10):
 19     print element
 20 
 21