Feature or enhancement

Proposal:

We can improve performance ofos.join by changing

        for b in map(os.fspath, p):

into

        for w in p:            b=os.fspath(w)

Themap generator takes time to create and the application of the method to each element also takes some time. A quick benchmark

main: 385 ns ± 11.5 ns per loop (mean ± std. dev. of 7 runs, 1,000,000 loops each)map replaced: 328 ns ± 9.8 ns per loop (mean ± std. dev. of 7 runs, 1,000,000 loops each)

The idea still needs to be tested on other platforms and with longer sequences.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-117648: Improve performance of os.join by replacing map with a direct method … #117654
• gh-117648: Remove unneeded and imprecise NEWS entry #117693
• gh-117648: Amend NEWS entry #117697