dead_code.py 文件源码

def visit_If(self, node):
        new_node = self._visit_if_while(node)
        if new_node is not None:
            return new_node

        if node.orelse and is_empty_body(node.orelse):
            self.log_node_removal("Remove dead code (empty else block of if)",
                                  node.orelse)
            new_node = copy_node(node)
            del new_node.orelse[:]
            node = new_node

        if is_empty_body(node.body) and not is_empty_body(node.orelse):
            self.log_node_removal("Remove dead code (empty if block)",
                                  node.body)
            new_node = copy_node(node)
            not_test = ast.UnaryOp(op=ast.Not(), operand=node.test)
            copy_lineno(node.test, not_test)
            new_node = ast.If(test=not_test, body=new_node.orelse, orelse=[])
            copy_lineno(node, new_node)
            return new_node

        return node