Python yield usage

When yield is used in a function, the function does not return data, but instead returns a Generator object (Generator object), which actually runs when the loop is traversed to get the actual value.

Example one is the example I see in a book, and the second is the example I have simplified, which makes no difference in functionality.

#示例一: Def filereadlines ():    seek = 0    while  True:        with open ('/home/python/passwd ',  ' r ')  as  f:            f.seek (Seek)              data = f.readline ()              if data:                 seek = f.tell ()                  yield data             else:                 return                 For item in filereadlines ():     print (item) #示例二: Def filereadline ():     with open ('/home/python/passwd ',  ' r ')  as f:         for line in f:             yield linefor item in filereadline ():    print (item)

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Python yield usage