code: def read_excel(
      filename: PathLike,
      sheet: Union[str, int],
      dtype: str='float32',
  ) -> AnnData:
      
      # rely on pandas for reading an excel file
      from pandas import read_excel
      df = read_excel(fspath(filename), sheet)
      X = df.values[:, 1:]
      row = {'row_names': df.iloc[:, 0].values.astype(str)}
      col = {'col_names': np.array(df.columns[1:], dtype=str)}
      return AnnData(X, row, col, dtype=dtype)
docs: Read ``.xlsx`` (Excel) file.
  
      Assumes that the first columns stores the row names and the first row the
      column names.
  
      Parameters
      ----------
      filename
          File name to read from.
      sheet
          Name of sheet in Excel file.