Good Python generators example?

Edward C. Jones edcjones at
Mon Apr 21 03:57:30 CEST 2003

Robert Oschler wrote:
> Can someone point me to a nice concise Python 2.2 compatible example of the
> use of generators?

def walk(top, hidden=False):
     """ Walk through a tree of directories"""
     if not hidden and os.path.basename(top)[0] == '.':
     if os.path.exists(top):
         yield top
     if not os.path.isdir(top):
     names = listdir(top)
     if names == None:
     for name in names:
         fullname = os.path.join(top, name)
         for name2 in walk(fullname, hidden):
             yield name2

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