MemoryError: null
  ...
  File "....", line 13, in repack__file
    shutil.unpack_archive(local_file_path, local_dir)
  File "python3.6/shutil.py", line 983, in unpack_archive
    func(filename, extract_dir, **kwargs)
  File "python3.6/shutil.py", line 901, in _unpack_zipfile
    data = zip.read(info.filename)
  File "python3.6/zipfile.py", line 1338, in read
    return fp.read()
  File "python3.6/zipfile.py", line 858, in read
    buf += self._read1(self.MAX_N)
  File "python3.6/zipfile.py", line 948, in _read1
    data = self._decompressor.decompress(data, n)

shutil.unpack_archive tries to read the whole file into memory, making use of any buffer at all. Python crashes for really large files. In my case — archive: ~1.7G, unpacked: ~10G. Interestingly zipfile.ZipFile.extractall handles this case more effective.