Add a function to uncompress .tar.gz file in python

import os

import pandas as pd

import tempfile

import tarfile

import sys

from rdkit import Chem

from rdkit.Chem.Scaffolds import MurckoScaffold

      name = name[name.rfind('/') + 1:]

  urlretrieve(url, os.path.join(dest_dir, name))

def untargz_file(file, dest_dir=get_data_dir(),name=None):

  """Untar and unzip a .tar.gz file to disk.

  Parameters

  ----------

  file: str

    the file to decompress

  dest_dir: str

    the directory to save the file in

  name: str

    the file name to save it as.  If omitted, it will use the file name 

  """

  if name is None:

    name = file	

  tar = tarfile.open(name)

  tar.extractall(path=dest_dir)

  tar.close()

class ScaffoldGenerator(object):

  """