code: def evaluate(self):
          
  
          try:
              self.condition = self.terms.prune(ConditionBinOp)
          except AttributeError:
              raise ValueError("cannot process expression [{expr}], [{slf}] "
                               "is not a valid condition".format(expr=self.expr,
                                                                 slf=self))
          try:
              self.filter = self.terms.prune(FilterBinOp)
          except AttributeError:
              raise ValueError("cannot process expression [{expr}], [{slf}] "
                               "is not a valid filter".format(expr=self.expr,
                                                              slf=self))
  
          return self.condition, self.filter
docs: create and return the numexpr condition and filter