# data.science.example.py
def do_report(data_source):
    # fetch and prepare data
    data = fetch_data(data_source)
    parsed_data = parse_data(data)
    filtered_data = filter_data(parsed_data)
    polished_data = polish_data(filtered_data)

    # run algorithms on data
    final_data = analyse(polished_data)

    # create and return report
    report = Report(final_data)
    return report


if __name__ == "__main__":

    print(
        "Please don't call the `do_report` function. "
        "It's just and example."
    )