Decompressing bz2 in multiple sub-directories

[kiton]

Hi there! My root folder contains multiple sub-directories each of which contains multiple *.json.bz2 files. My goal is to decompress the bz2 files and place them in the same sub-directories where they are. Using examples found online, I am trying to run the following code (please note two additional questions mentioned there):

import sys
import os
import bz2
from bz2 import decompress

path = '/Users/mymac/Documents/Jupyter/Twitter/05'
for subdir, dirs, files in os.walk(path):
    for filename in files:
        filepath = os.path.join(dirpath, filename)
        newfilepath = os.path.join(dirpath, filename[:-4]) # Remove ".bz2" in the end
        with open(newfilepath, 'wb') as new_file, bz2.BZ2File(filepath, 'rb') as file:
            for data in iter(lambda : file.read(100 * 1024), b''):
                new_file.write(data)
#Question: how do I delete the the "*.json.bz2" after they are deompressed?

However, it returns the following error message:
---------------------------------------------------------------------------
IsADirectoryError                         Traceback (most recent call last)
<ipython-input-20-6e967e3c97bb> in <module>()
     9         filepath = os.path.join(dirpath, filename)
    10         newfilepath = os.path.join(dirpath, filename[:-4])
---> 11         with open(newfilepath, 'wb') as new_file, bz2.BZ2File(filepath, 'rb') as file:
    12             for data in iter(lambda : file.read(100 * 1024), b''):
    13                 new_file.write(data)

IsADirectoryError: [Errno 21] Is a directory: '/Users/mymac/Documents/Jupyter/Twitter/05/.'

Please advise what I am doing wrong here. Thank you in advance!