[issue23605] Use the new os.scandir() function in os.walk()

[Ben Hoyt]

Ben Hoyt added the comment:

Note specifically in the unsymlink() example Serhiy gave, you probably don't *want* os.walk() to recurse into a symlink-to-a-directory-that's-changed-to-a-directory, and you probably haven't thought about it doing so, so maybe the new behaviour is fine?

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<http://bugs.python.org/issue23605>
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