Add `top_down` parameter to `(i)glob` and `Path.(r)glob` matching `{os,Path}.walk`

Feature or enhancement

Proposal:

Recursively searching for globs is a common use case when working with the filesystem. In cases where one modifies files while working in them it is useful to specify whether one first wants to recurse into directories or first get all the files in a directory before recursing into subdirs.

One simply example is when one wants to delete all empty directories:

for d in context.root.glob("**/", top_down=False):
    if d == context.root:
        continue

    if not any(d.iterdir()):
        d.rmdir()

Currently, one has two alternatives (apart from reimplementing glob) which have their respective drawbacks:

• for d in reversed(sorted(context.root.glob("**/"))): ... This eagerly consumes and sorts the iterator. This has the drawback of requiring a lot of memory for large trees and taking additional time for the sorting.
• for d, _, _ in context.root.walk(top_down=False): ... This works for this simple case but does not allow applying search patterns e.g. only looking for empty directories somewhere under .venv (e.g. **/.venv/**/)

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

首先跟踪现有的 (i)glob 和 Path.(r)glob 入口点，将其行为与 {os,Path}.walk 进行比较。为递归 globbing 实现所请求的 top_down 行为，然后验证诸如 **/ 之类的模式支持自底向上的遍历，同时保留现有的 glob 行为。