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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def download_file(url, local_filename):
 """ Simple wrapper around urlretrieve that uses tqdm to display a progress bar of download progress """

    local_filename = os.path.abspath(local_filename)
    path = os.path.dirname(local_filename)
    if not os.path.isdir(path):
        os.makedirs(path)

    with tqdm(unit='B', unit_scale=True) as progress:
        def report(chunk, chunksize, total):
            progress.total = total
            progress.update(chunksize)
        return urlretrieve(url, local_filename, reporthook=report)