How to use the meteomatics.api.query_init_date function in meteomatics

print("Failed, the exception is {}".format(e))

        print("\nstation wmo + metar ids timeseries:")
        try:
            df_sd_ids = api.query_station_timeseries(startdate_station_ts, enddate_station_ts, interval_station_ts,
                                                     parameters_station_ts, username, password, model=model_station_ts,
                                                     wmo_ids=wmo_stations, metar_ids=metar_stations,
                                                     mch_ids=mch_stations, on_invalid='fill_with_invalid',
                                                     request_type="POST", temporal_interpolation='none')
            print(df_sd_ids.head())
        except Exception as e:
            print("Failed, the exception is {}".format(e))

        print("\nget init dates:")
        try:
            df_init_dates = api.query_init_date(now, now + dt.timedelta(days=2), dt.timedelta(hours=3), 't_2m:C',
                                                username,
                                                password, 'ecmwf-ens')
            print(df_init_dates.head())
        except Exception as e:
            print("Failed, the exception is {}".format(e))

        print("\nget available time ranges:")
        try:
            df_time_ranges = api.query_available_time_ranges(['t_2m:C', 'precip_6h:mm'], username, password,
                                                             'ukmo-euro4')
            print(df_time_ranges.head())
        except Exception as e:
            print("Failed, the exception is {}".format(e))

    else:
        print("""