Method _show_display

Lib/pdb.py:668–680

(self)

    # Called before loop, handles display expressions
    # Set up convenience variable containers
    def _show_display(self):
        displaying = self.displaying.get(self.curframe)
        if displaying:
            for expr, oldvalue in displaying.items():
                newvalue = self._getval_except(expr)
                # check for identity first; this prevents custom __eq__ to
                # be called at every loop, and also prevents instances whose
                # fields are changed to be displayed
                if newvalue is not oldvalue and newvalue != oldvalue:
                    displaying[expr] = newvalue
                    self.message('display %s: %s  [old: %s]' %
                                 (expr, self._safe_repr(newvalue, expr),
                                  self._safe_repr(oldvalue, expr)))

    def _get_tb_and_exceptions(self, tb_or_exc):
        """