[Python-Dev] os.path.diff(path1, path2) (original) (raw)
Greg Ewing greg.ewing at canterbury.ac.nz
Wed Sep 21 02:55:56 CEST 2005
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Matthias Andreas Benkard wrote:
But this begs the question: What is relpath good for, anyway?
[Assuming you mean "invites", "prompts", etc. the question...:-)]
A couple of use cases I've encountered:
Creating symbolic links. I'm traversing a directory hierarchy, and building a parallel hierarchy somewhere else that contains symbolic links into the original one. I want the links to be relative, so that e.g. I can move my home directory without all my links breaking.
In a recent project, I had occasion to store pathnames of picture files in a relational database. I wanted to store the pathnames relative to a user-chosen "Pictures" directory, so that it could be moved without having to update all the pathnames in the database.
Both of these happen to involve pathnames that exist on the currrently available file system, but I can easily imagine cases where that would not be so. E.g. I might be generating pathames to go into a tar file that will be unpacked in a different place or on another system.
-- Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg.ewing at canterbury.ac.nz +--------------------------------------+
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