In <mailman.1196.1255347115.2807.python-l...@python.org> Dave Angel <da...@ieee.org> writes:
>kj wrote: >> Perl's directory tree traversal facility is provided by the function >> find of the File::Find module. This function accepts an optional >> callback, called postprocess, that gets invoked "just before leaving >> the currently processed directory." The documentation goes on to >> say "This hook is handy for summarizing a directory, such as >> calculating its disk usage", which is exactly what I use it for in >> a maintenance script. >> >> This maintenance script is getting long in the tooth, and I've been >> meaning to add a few enhancements to it for a while, so I thought >> that in the process I'd port it to Python, using the os.walk >> function, but I see that os.walk does not have anything like this >> File::Find::find's postprocess hook. Is there a good way to simulate >> it (without having to roll my own File::Find::find in Python)? >> >> TIA! >> >> kynn >> >> >Why would you need a special hook when the os.walk() generator yields >exactly once per directory? So whatever work you do on the list of >files you get, you can then put the summary logic immediately after. >Or if you really feel you need a special hook, then write a wrapper for >os.walk(), which takes a hook function as a parameter, and after >yielding each file in a directory, calls the hook. Looks like about 5 >lines. I think you're missing the point. The hook in question has to be called *immediately after* all the subtrees that are rooted in subdirectories contained in the current directory have been visited by os.walk. I'd love to see your "5 lines" for *that*. kj -- http://mail.python.org/mailman/listinfo/python-list