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def showmedoc(func):
     if func.__doc__:
          print 'has doc'
     else:
          print 'no doc'
     return func                                      #±ð×°ÊÎÁËÖ®ºó°ÑÈ˼ÒÔ­À´µÄº¯Êý¸ø¸ÇÁË£¬³ýÁËÐèÒªµÄÇé¿ö...
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@showmedoc
def f1():
    '''i have doc'''
    pass
@showmedoc
def f2():
     pass
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>>>
has doc
no doc
>>>
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def say_hi():
    print 'hello'
def showmedoc(func):
    if func.__doc__:
        print 'has doc '
    else:
        print 'no doc'
    return say_hi
@showmedoc
def f1():
    '''hello world'''
    print "hihi"
f1()
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>>>
has doc
hello
>>>
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