On Tuesday 13 May 2003 15:51, Guido van Rossum wrote: > > I've just noticed that os.walk() silently skips unreadable > > directories. I think this is surprising behaviour, which at > > least should be documented (there is a comment explaining this is > > source, but nothing in the doc string). Is it too late to add an > > optional callback argument to handle unreadable directories, so > > the caller could log them, raise an exception or whatever? I > > think the default behaviour should still be to silently ignore > > them, but it would be nice to have a way to override it. > > Ignoring is definitely the right thing to do by default, as > otherwise the existence of a single unreadable directory would > cause your entire walk to fail. What's your use case for wanting > to do something else? Sometimes I'm looking for something in a files in directory tree, forgetting I don't have access permissions to a particular subdirectory by default. So the search can silently fail, and I'm left with the wrong idea that what I was looking is not there. Ideally, I'd like the possibility have my script remind me to login as root prior to running it. I know I could do some defensive programming in the walker function to go around this, but I this would likely imply more stat calls and impact performance. I've been bitten by this a couple of times, so I thought I'd pipe in. -Harri
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