There are a couple of minor performance improvements possible inos.walk():

• We don't need to manually pump theos.scandir iterator, given we handle exceptions fromnext() like exceptions fromscandir() itself, i.e. by ignoring the problematic directory and moving on. We can use afor loop like filthy casuals.
• In bottom-up mode, we can handle exceptions fromentry.is_symlink() in the same block as those fromentry.is_dir(), which avoids a few temporary variables.
• In top-down mode, we can callos.path.join() once on a parent directory rather than for each child path.

Linked PRs

• GH-119169: Speed upos.walk(topdown=False) #119186
• GH-119169: Skip reversing sibling directories inos.[f]walk(topdown=False) #119473
• GH-119169: Implementpathlib.Path.walk() usingos.walk() #119573
• [3.13] GH-119169: Implementpathlib.Path.walk() usingos.walk() (GH-119573) #119750
• GH-119169: Slightly speed upos.walk(topdown=True) #121431
• GH-119169: Simplifyos.fwalk() exception handling #121432
• GH-119169: Speed upos.fwalk(topdown=False) #121433
• GH-119169: Simplifyos.walk() exception handling #121435