unzip.py

import os
import zipfile

def unzip(zip_file):
    zip_filename = zip_file
    target_dir = 'img'
    if not os.path.exists(target_dir):
        os.makedirs(target_dir)
        with zipfile.ZipFile(zip_filename, 'r') as zip_ref:
            zip_ref.extractall(target_dir)