code: def request_all_data(cls, time, pressure=None, **kwargs):
          
          endpoint = cls()
          df = endpoint._get_data(time, None, pressure, **kwargs)
          return df
docs: Retrieve upper air observations from Iowa State's archive for all stations.
  
          Parameters
          ----------
          time : datetime
              The date and time of the desired observation.
  
          pressure : float, optional
              The mandatory pressure level at which to request data (in hPa). If none is given,
              all the available data in the profiles is returned.
  
          kwargs
              Arbitrary keyword arguments to use to initialize source
  
          Returns
          -------
              :class:`pandas.DataFrame` containing the data