Renames SRT files to match MP4 names in folder in sorted order (e.g. by episode) to be auto-detected by media players.

srt_fix.py

from functools import partial
from pathlib import Path

print_app = partial(print, "SRT Fix:")
files = [f for f in Path().iterdir() if f.is_file()]
mp4 = sorted([f for f in files if f.suffix.lower().endswith(".mp4")])
srt = sorted([f for f in files if f.suffix.lower().endswith(".srt")])
assert len(mp4) == len(srt), f"Count miss! MP4s: {len(mp4)}, SRTs: {len(srt)}."
print_app(
    f"Looking at {len(mp4)} MP4 files with matching subs starting with"
    f"\n(MP4) {mp4[0]}"
    f"\n(SRT) {srt[0]}"
    f"\nIf this looks correct press Enter."
)
input()
for mp4_f, srt_f in zip(mp4, srt):
    target_name = mp4_f.with_suffix(srt_f.suffix)
    if srt_f == target_name:
        continue
    srt_f.rename(target_name)
print_app("Done.")