code: def change_prior(self,**kwargs):
          
          for kw,val in kwargs.items():
              if kw=='area':
                  logging.warning('cannot change area in this way--use change_maxrad instead')
                  continue
              for pop in self.poplist:
                  k = {kw:val}
                  pop.change_prior(**k)
docs: Changes prior factor(s) in all populations