Python에서 재귀 하위 폴더의 파일을 효율적으로 나열하는 방법은 무엇입니까?

<code class="python">for root, subFolder, files in os.walk(PATH):
    for item in files:
        if item.endswith(".txt"):
            fileNamePath = str(os.path.join(root, subFolder, item))</code>

<code class="python">import os
result = [os.path.join(dp, f) for dp, dn, filenames in os.walk(PATH) for f in filenames if os.path.splitext(f)[1] == '.txt']</code>

<code class="python">from glob import glob
result = [y for x in os.walk(PATH) for y in glob(os.path.join(x[0], '*.txt'))]</code>

<code class="python">from itertools import chain
result = (chain.from_iterable(glob(os.path.join(x[0], '*.txt')) for x in os.walk('.')))</code>

<code class="python">from pathlib import Path
result = list(Path(".").rglob("*.[tT][xX][tT]"))</code>