utils.py 文件源码

def visitUnaryOp(self, node):
        import ast
        if isinstance(node.op, ast.UAdd):
            return +self.visit(node.operand)
        elif isinstance(node.op, ast.USub):
            return -self.visit(node.operand)
        else:
            raise SyntaxError("Unknown unary op: %r" % node.op)