import hashlib



def calculate_md5_checksum(string_to_md5_sum: str):
    return hashlib.md5(string_to_md5_sum.encode('utf-8')).hexdigest()


def file_md5(fname: str) -> str:
    hash_md5 = hashlib.md5()
    with open(fname, "rb") as f:
        for chunk in iter(lambda: f.read(4096), b""):
            hash_md5.update(chunk)
    return hash_md5.hexdigest()


if __name__ == '__main__':
    print(file_md5(__file__))