removing portion of filename - file

Question

I have done some searching but cannot see how to actually code this. I am new to Python and not really sure what method I should use to try to do this.
I have some files that I would like to rename. Unfortunately the portion towards the file extension is never the same and would like to just remove it.
File name is like AC_DC - Shot Down In Flames (Official Video)-UKwVvSleM6w.mp3
Any help would be appreciated.

Answer 1

Since this looks like the result from youtube-dl, the "random" substring is most likely the unique video id, which in my experience is always 11 characters long. It can, however, include dashes (-), so the regex-approach suggested by smitrp would not always work.
I use this "dirty" workaround:
>>> original_name="AC_DC - Shot Down In Flames (Official Video)-UKwVvSleM6w.mp3"
>>> new_name=original_name[:-16]+".mp3"
>>> new_name
'AC_DC - Shot Down In Flames (Official Video).mp3'
Edit:
If you really, REALLY want to find the "-XXXX"-portion, have a look at str.rfind(). This will help you to find the index of the last dash (-), which you can directly use for the slice notation of the string.
Disclaimer:
This will provide wrong results, if the video id contains a dash, e.g. here: https://www.youtube.com/watch?v=7WVBEB8-wa0
Then you will find the last dash, remove -wa0 and be left with -7WVBEB8 at the end of the filename.

Answer 2

Using idea of the above answer, one can also take into account that a normal word does not
contain more than one capital character.
def youtube_name_fix(folder):
import os
from pathlib import Path
import re
REGEX = re.compile(r'[A-Z]')
for name in os.listdir(folder):
basename = Path(name)
last_12 = basename.stem[-12:]
# check if the end string is not all uppercase (then it could be part of a valid name)
if not last_12.isupper():
# check if the last string has more than one uppercase letters
if len(REGEX.findall(last_12)) > 1:
# remove the end youtube string and create new full path
new_name = os.path.join(folder, basename.stem[:-12] + basename.suffix)
try:
os.rename(os.path.join(folder,name), new_name)
except Exception as e:
print(e)
> youtube_name_fix(p)
old name -> "4-Discrete and Continuous Probability Models-esHwigpYggU.mp4"
new name -> "4-Discrete and Continuous Probability Models.mp4"