file.zip
    - first folder
      - file1.pdf
      - file2.pdf
    - second folder
      - file3.pdf

zip_file = ZipFile(zip_file_path)

zip_byte_array = bytearray()
for filename in zip_file.namelist():
    byte_content = zip_file.read(filename)
    zip_byte_array.append(byte_content)

an integer is required

zip_file_path = shutil.make_archive(dir_path, 'zip', dir_path)