Unzips <source_file> into <destination_dir>.
    :param str|unicode source_file: The name of the file to read
    :param str|unicode destination_dir: The name of the directory to write the unzipped files

def unzip(source_file, destination_dir):
    """
    Unzips <source_file> into <destination_dir>.
    :param str|unicode source_file: The name of the file to read
    :param str|unicode destination_dir: The name of the directory to write the unzipped files
    """
    with zipfile.ZipFile(source_file) as zf:
        zf.extractall(destination_dir)