import pandas as pd from functools import reduce source_csv = 'data\\Kontenrahmen_Import.csv' target_csv = 'data\\Kontenrahmen.csv' result_csv = 'data\\Kontenrahmen_Ergebnis.csv' debug = False cols_pkey = ['Konto_Nr'] def update(d, other): d.update(dict(dict(other))) return d def get_dict(cols, type): return dict(dict(zip(cols, [type] * len(cols)))) # cols_dict = reduce(update, (get_dict(cols_pkey, np.str), get_dict(cols_str, np.str), get_dict(cols_float, np.float)), {}) df_source = pd.read_csv(source_csv, decimal=",", sep=";", encoding="ansi", converters={i: str for i in range(0, 200)}) df_source['pkey'] = reduce(lambda x, y: x + "_" + df_source[y], cols_pkey, "") df_source = df_source.set_index('pkey') df_target = pd.read_csv(target_csv, decimal=",", sep=";", encoding="ansi", converters={i: str for i in range(0, 200)}) target_columns = df_target.columns df_target['pkey'] = reduce(lambda x, y: x + "_" + df_target[y], cols_pkey, "") df_target = df_target.set_index('pkey') df_join = df_source.join(df_target, rsuffix='_other')[target_columns] # df_result = df_join[(df_join['Gesamt'] != 0) & (df_join['Serviceberater'] != "")] df_join.to_csv(result_csv, decimal=",", sep=";", encoding="ansi", index=None)