def write_mmtf(file_path, input_data, input_function):
mmtf_encoder = MMTFEncoder()<EOL>pass_data_on(input_data, input_function, mmtf_encoder)<EOL>mmtf_encoder.write_file(file_path)<EOL>
API function to write data as MMTF to a file

    :param file_path the path of the file to write
    :param input_data the input data in any user format
    :param input_function a function to converte input_data to an output format. Must contain all methods in TemplateEncoder