Problem in directory working
__peter__ at web.de
Sun Jan 11 10:18:52 CET 2004
Gyoung-Yoon Noh wrote:
> I've written Unix's find-like function using recursive os.listdir()
> call and generator expression. It seems that error happens in
> generator expression.
> Below codes do not work. walk.next() generates StopIteration.
> When I replace 'yield' with 'print', it works fine.
> Why this does not work?
> I've had successively implemented unix-find using os.path.walk().
> But I want to combine recursive call and generator expressions.
> Any comments are welcome.
> import os
> def find(path):
> if not os.path.exists(path):
> raise StopIteration
> if os.path.isdir(path):
> for l in os.listdir(path):
> fullpath = os.sep.join((path, l))
for p in find(fullpath):
> yield path
> if __name__=='__main__':
> #find('/home/myhome'); raise SystemExit()
> walk = find('/home/myhome')
> for i in walk:
> print i.next()
Just writing find(somepath) will create a new generator but only yield a
value when its next() method is called. This is done implicitly by the for
loop I inserted into your code. Do you know about 2.3's new os.walk()? It
would make a good building block for routines scanning the file system.
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