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利用dir(obj)方法获得obj对象的所有属性和方法名，返回一个list。

for item in dir(top_k_metergroup):  #top_k_metergroup是某类的一个实例化对象    print(item)

__class____delattr____dict____dir____doc____eq____format____ge____getattribute____getitem____gt____hash____init____init_subclass____le____lt____module____ne____new____reduce____reduce_ex____repr____setattr____sizeof____str____subclasshook____weakref___aggregate_metadata_attribute_check_kwargs_for_full_results_and_sections_collect_stats_on_all_meters_convert_physical_quantity_and_ac_type_to_cols_energy_per_meter_with_remainder_meter_generators_plot_area_plot_energy_bar_plot_sankey_plot_separate_lines_prep_kwargs_for_sample_period_and_resample_replace_none_with_meter_timeframe_set_sample_periodactivation_seriesactivity_histogramall_metersappliancesavailable_ac_typesavailable_physical_quantitiesavailable_power_ac_typesaverage_energy_per_periodbuildingcall_method_on_all_metersclear_cachecontains_meters_from_multiple_buildingscorrelationcorrelation_of_sum_of_submeters_with_mainsdataframe_of_metersdatasetdescribedisabled_metersdominant_appliancedominant_appliancesdraw_wiring_graphdropout_rateenergy_per_meterentropyentropy_per_meterfraction_per_meterfrom_listfrom_other_metergroupget_activationsget_labelsget_timeframegood_sectionsgroupbyidentifierimport_metadatainstanceis_site_meterlabelloadload_seriesmainsmatchesmatches_appliancesmetersmeters_directly_downstream_of_mainsmin_off_durationmin_on_durationmutual_informationnamenested_metergroupson_power_thresholdpairwisepairwise_correlationpairwise_mutual_informationplotplot_activity_histogramplot_autocorrelationplot_good_sectionsplot_lagplot_multipleplot_power_histogramplot_spectrumplot_when_onpower_seriespower_series_all_dataproportion_of_energyproportion_of_energy_submeteredproportion_of_upstreamproportion_of_upstream_total_per_metersample_periodselectselect_top_kselect_using_appliancessimultaneous_switchessort_meterssubmetersswitch_timestotal_energytrain_test_splitunionupstream_meteruptimeuse_alternative_mainsvalues_for_appliance_metadata_keyvampire_powerwhen_onwiring_graph

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