code: def _pdf(self, **kwargs):
          
          return self._polardist._pdf(**kwargs) * \
              self._azimuthaldist._pdf(**kwargs)
docs: Returns the pdf at the given angles.
  
          Parameters
          ----------
          \**kwargs:
              The keyword arguments should specify the value for each angle,
              using the names of the polar and azimuthal angles as the keywords.
              Unrecognized arguments are ignored.
  
          Returns
          -------
          float
              The value of the pdf at the given values.