[issue20764] os.walk recurses down even with dirnames deleted

[Ned Deily]

Ned Deily added the comment:

I think you are misunderstanding how del and mutable sequences work.  In your code snippet, the del unbinds the name "root_dir" but it does not alter the dirnames list object returned by os.path.  Try replacing "del root_dir" with "del root_dir[:]" or "root_dir.clear()".

http://docs.python.org/3/reference/simple_stmts.html#the-del-statement
http://docs.python.org/3/library/stdtypes.html#mutable-sequence-types

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nosy: +ned.deily
resolution:  -> invalid
stage:  -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue20764>
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