following class will when called for indexingthe argument is an integer as beforeclass indexerdata [ def __getitem__(selfindex)print('getitem:'indexreturn self data[indexx indexer( [ getitem [ getitem [- getitem- called for index or slice perform index or slice indexing sends __getitem__ an integer when called for slicingthoughthe method receives slice objectwhich is simply passed along to the embedded list indexer in new index expressionx[ : getitemslice( none[ [ :getitemslice( nonenone[ [:- getitemslice(none- none[ [:: getitemslice(nonenone [ slicing sends __getitem__ slice object where needed__getitem__ can test the type of its argumentand extract slice object bounds--slice objects have attributes startstopand stepany of which can be none if omittedclass indexerdef __getitem__(selfindex)if isinstance(indexint)test usage mode print('indexing'indexelseprint('slicing'index startindex stopindex stepx indexer( [ indexing [ : : slicing [ :slicing none none operator overloading