Jussi Piitulainen wrote: > Peter Otten writes: > >> Steve D'Aprano wrote:
>>> The wider context is that I'm taking from 1 to <arbitrarily huge number> >>> path names to existing files as arguments, and for each path name I >>> transfer the file name part (but not the directory part) and then rename >>> the file. For example: >>> >>> foo/bar/baz/spam.txt >>> >>> may be renamed to: >>> >>> foo/bar/baz/ham.txt >>> >>> but only provided ham.txt doesn't already exist. >> >> Google finds >> >> http://stackoverflow.com/questions/3222341/how-to-rename-without-race-conditions >> >> and from a quick test it appears to work on Linux: > > It doesn't seem to be documented. For functions with a C equivalent a look into the man page is usually helpful. > I looked at help(os.link) on Python > 3.4 and the corresponding current library documentation on the web. I > saw no mention of what happens when dst exists already. > > Also, creating a hard link doesn't seem to work between different file > systems, which may well be relevant to Steve's case. In his example above he operates inside a single directory. Can one directory spread across multiple file systems? > I get: > > OSError: [Errno 18] Invalid cross-device link: [snip] > > And that also is not mentioned in the docs. -- https://mail.python.org/mailman/listinfo/python-list
