def get_callers(self, ctx):
        node_state = self._get_state(ctx)
        results = []
        for ctx_id, callers in node_state.callers.iteritems():
            ctx = _get_context(ctx_id, ctx)
            for callee in callers:
                results.append((callers, ctx))
        return results
Delete graphics item from canvas.
dataset/ETHPy150Open manahl/mdf/mdf/nodes.py/MDFNode.get_callers--crossover with--dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/site-packages/turtle.py/TurtleScreenBase._delete