Randomly copy MP3 files to a new directory until the target directory reaches a certain file size

copy.py

import pathlib
import random
import shutil

mp3_files = list(pathlib.Path('/Users/scott/Desktop/Music').rglob('*.mp3'))
dst_dir = pathlib.Path('/Users/snewman/Desktop/CopiedMusic')

TARGET_SIZE = 1979999999

for x in range(0, len(mp3_files)):
    src_file = random.choice(mp3_files)
    dst_file = dst_dir / src_file.name
    shutil.copyfile(src_file, dst_file)
    
    directory_size = sum(f.stat().st_size for f in dst_dir.glob('*.mp3') if f.is_file())
    
    if directory_size < TARGET_SIZE:
        continue