code: def relative_humidity_from_dewpoint(temperature, dewpt):
      r
      e = saturation_vapor_pressure(dewpt)
      e_s = saturation_vapor_pressure(temperature)
      return (e / e_s)
docs: r"""Calculate the relative humidity.
  
      Uses temperature and dewpoint in celsius to calculate relative
      humidity using the ratio of vapor pressure to saturation vapor pressures.
  
      Parameters
      ----------
      temperature : `pint.Quantity`
          The temperature
      dew point : `pint.Quantity`
          The dew point temperature
  
      Returns
      -------
      `pint.Quantity`
          The relative humidity
  
      See Also
      --------
      saturation_vapor_pressure