code: def read_file(self, filepath, **kwargs):
          
          try:
              model = self._models[filepath]
          except KeyError:
              model = read_file(filepath, **kwargs)
              self._models[filepath] = model
              self.signalNewModelRead.emit(filepath)
          finally:
              self._paths_read.append(filepath)
  
          return self._models[filepath]
docs: Reads a filepath into a DataFrameModel and registers
          it.
          Example use:
              dfmm = DataFrameModelManger()
              dfmm.read_file(path_to_file)
              dfm = dfmm.get_model(path_to_file)
              df = dfm.get_frame(path_to_file)
  
          :param filepath: (str)
              The filepath to read
          :param kwargs:
              .xlsx files: pandas.read_excel(**kwargs)
              .csv files: pandas.read_csv(**kwargs)
          :return: DataFrameModel