def _dataframe_to_csv(writer, dataframe, delimiter, with_header):
    encoding_writer = codecs.getwriter('utf-8')(writer)
    dataframe.to_csv(
        path_or_buf=encoding_writer,
        sep=delimiter,
        header=with_header,
        index=False
    )
has_key <key>
dataset/ETHPy150Open Azure/Azure-MachineLearning-ClientLibrary-Python/azureml/serialization.py/_dataframe_to_csv--crossover with--dataset/ETHPy150Open kdart/pycopia/fepy/pycopia/fepy/CLI.py/DictCLI.has_key