python copy file with progress bar in terminal

progress_copy.py

import os
from io import BytesIO
from tqdm import tqdm
file = 'FILENAME'
fsize = int(os.path.getsize(file))
new = 'NEWFILENAME'
with open(file, 'rb') as f:
    with open(new, 'ab') as n:
        with tqdm(ncols=60, total=fsize, bar_format='{l_bar}{bar} | Remaining: {remaining}') as pbar:
            buffer = bytearray()
            while True:
                buf = f.read(8192)
                n.write(buf)
                if len(buf) == 0:
                    break
                buffer += buf
                pbar.update(len(buf))