cfg.py 文件源码

def visit_Assign(self, node):
        rhs_visitor = RHSVisitor()
        rhs_visitor.visit(node.value)
        if isinstance(node.targets[0], ast.Tuple): #  x,y = [1,2]
            if isinstance(node.value, ast.Tuple):
                return self.assign_tuple_target(node, rhs_visitor.result)
            elif isinstance(node.value, ast.Call):
                call = None
                for element in node.targets[0].elts:
                    label = LabelVisitor()
                    label.visit(element)
                    call = self.assignment_call_node(label.result, node)
                return call
        elif len(node.targets) > 1:                #  x = y = 3
            return self.assign_multi_target(node, rhs_visitor.result)
        else:                                      
            if isinstance(node.value, ast.Call):   #  x = call()

                label = LabelVisitor()
                label.visit(node.targets[0])
                return self.assignment_call_node(label.result, node)
            else:                                  #  x = 4
                label = LabelVisitor()
                label.visit(node)
                return self.append_node(AssignmentNode(label.result, self.extract_left_hand_side(node.targets[0]), node, rhs_visitor.result, line_number = node.lineno, path=self.filenames[-1]))