Use set comprehension for posixpath.commonpath() #117641
Description
Feature or enhancement
Proposal:
We can use a set comprehension to check if no absolute and relative paths are mixed:
-try: - isabs, = set(p[:1] == sep for p in paths) -except ValueError: - raise ValueError("Can't mix absolute and relative paths") from None +if len({p.startswith(sep) for p in paths}) != 1: + raise ValueError("Can't mix absolute and relative paths")-prefix = sep if isabs else sep[:0] +prefix = sep if paths[0].startswith(sep) else sep[:0]This is faster and more readable.
Has this already been discussed elsewhere?
This is a minor feature, which does not need previous discussion elsewhere