Creates a non-horrible-looking unique filename that's checked to not exist, easily editable to taste. Modification of this response https://stackoverflow.com/a/15746092/6194588

unique_filename.py

import os

from random import sample
from string import digits, ascii_uppercase, ascii_lowercase

# Checking the directory itself needs to be done prior to invocation, something like this would work depending on use
# if not os.path.exists(output_dir): os.mkdir(output_dir)

def unique_filename(output_dir, name, suffix='.txt', length=8):
    break_recursion = 100      # just in case...

    def unique_filename_4sure(_length, _break_recursion):
        if break_recursion <= 0:
            print('Err: [infinite recursion] something seriously messed up... ')
            return f'{output_dir}ERROR.txt'
        chars = ascii_lowercase + ascii_uppercase + digits
        rand_part = ''.join(sample(chars, _length))
        filename = f'{output_dir}{name}_{rand_part}{suffix}'
        return filename if not os.path.exists(filename) else unique_filename_4sure(_length, _break_recursion - 1)

    truly_unique_full_path = unique_filename_4sure(length, break_recursion)
    return truly_unique_full_path