

def _build_data_meta(self, dataset_data_list, df):
    merged_data_metadata = {
        
    }
    if dataset_data_list:
        merged_data_metadata = dataset_data_list[0].meta.copy()
        num_rows = len(df.index)
        if (num_rows > 0):
            merged_data_metadata['start_date'] = df.index[0].date()
            merged_data_metadata['end_date'] = df.index[(num_rows - 1)].date()
        df.pop('column_index', None)
        merged_data_metadata['column_names'] = self._merged_column_names_from(dataset_data_list)
    return merged_data_metadata

dataset/ETHPy150Open quandl/quandl-python/quandl/model/merged_dataset.py MergedDataset._build_data_meta/VarMisuse@94/146 `merged_data_metadata`->`df`