缺少参数age；PersonNode.__init__() missing 1 required positional argument: 'age'

1635731080

标题：PersonNode.init() missing 1 required positional argument: 'age'

提问模板：说缺少参数，但是感觉没有缺少

Traceback (most recent call last):
File "/home/ros/chapt2_3/chapt2_3_ws/install/demo_python_pkg/lib/demo_python_pkg/writer_node", line 33, in <module>
sys.exit(load_entry_point('demo-python-pkg==0.0.0', 'console_scripts', 'writer_node')())
File "/home/ros/chapt2_3/chapt2_3_ws/install/demo_python_pkg/lib/python3.10/site-packages/demo_python_pkg/writer_node.py", line 10, in main
node = WriterNode('法外狂徒张三', 18, '论快速入狱')
File "/home/ros/chapt2_3/chapt2_3_ws/install/demo_python_pkg/lib/python3.10/site-packages/demo_python_pkg/writer_node.py", line 5, in init
super().init(name, age)
TypeError: PersonNode.init() missing 1 required positional argument: 'age'

背景(可选)：

[在这里描述你要实现什么，也许有更好的方案]

问题描述：colcon build;

ros@ros-VirtualBox:~/chapt2_3/chapt2_3_ws$ source install/setup.bash
ros@ros-VirtualBox:~/chapt2_3/chapt2_3_ws$ ros2 run demo_python_pkg writer_node

Traceback (most recent call last):
File "/home/ros/chapt2_3/chapt2_3_ws/install/demo_python_pkg/lib/demo_python_pkg/writer_node", line 33, in <module>
sys.exit(load_entry_point('demo-python-pkg==0.0.0', 'console_scripts', 'writer_node')())
File "/home/ros/chapt2_3/chapt2_3_ws/install/demo_python_pkg/lib/python3.10/site-packages/demo_python_pkg/writer_node.py", line 10, in main
node = WriterNode('法外狂徒张三', 18, '论快速入狱')
File "/home/ros/chapt2_3/chapt2_3_ws/install/demo_python_pkg/lib/python3.10/site-packages/demo_python_pkg/writer_node.py", line 5, in init
super().init(name, age)
TypeError: PersonNode.init() missing 1 required positional argument: 'age'

具体细节和上下文：

person.py代码
import rclpy
from rclpy.node import Node

class PersonNode(Node):
def init(self, node_name: str, name: str, age: int) -> None:
super().init(node_name)
self.age = age
self.name = name

def eat(self, food_name: str):
    self.get_logger().info(f'我叫{self.name},今年{self.age}岁，我现在正在吃{food_name}')

def main():
rclpy.init()
node = PersonNode('person_node', '法外狂徒张三', '18')
node.eat('鱼香肉丝')
rclpy.spin(node)
rclpy.shutdown()

writer_node.py代码
from demo_python_pkg.person_node import PersonNode

class WriterNode(PersonNode):
def init(self, name: str, age: int, book: str) -> None:
super().init(name, age)
print('WriterNode 的 init 函数被调用了')
self.book = book

def main():
node = WriterNode('法外狂徒张三', 18, '论快速入狱')
node.eat('鱼香肉丝')

setup.py
entry_points={
'console_scripts': [
'python_node = demo_python_pkg.python_node:main',
'person_node = demo_python_pkg.person_node:main',
'writer_node = demo_python_pkg.writer_node:main',
],
},
目录展示

尝试过的解决方法：

问了deepseek，按照他的修改，但是显示新的错误，进行修改，继续报错

小鱼

@1635731080 你这个错误的本质是：

TypeError: PersonNode.__init__() missing 1 required positional argument: 'age'

虽然你明明传了 age，但出错行在 WriterNode.__init__() 的 super().__init__(name, age)，这说明它找的 super() 不是你想的 PersonNode(node_name, name, age)，而是找错了继承链！

核心问题分析：

你定义的 PersonNode 是：

class PersonNode(Node):
    def __init__(self, node_name: str, name: str, age: int) -> None:
        super().__init__(node_name)
        self.age = age
        self.name = name

然后 WriterNode 是：

class WriterNode(PersonNode):
    def __init__(self, name: str, age: int, book: str) -> None:
        super().__init__(name, age)  # ❌ 你以为你传给 PersonNode(name, age)
        self.book = book

但是你忘了：PersonNode 的构造函数需要 三个参数：node_name, name, age，你只传了两个。

正确写法：

你应该这样调用 PersonNode.__init__：

class WriterNode(PersonNode):
    def __init__(self, name: str, age: int, book: str) -> None:
        super().__init__('writer_node', name, age)  # ✅ 补上 node_name
        self.book = book
        print('WriterNode 的 __init__ 函数被调用了')

这里 'writer_node' 就是 ROS 节点名，随便你取，例如可以换成 'author_node'、'zhangsan_writer' 也行。

总结一句话：

你的 PersonNode.__init__() 要求是：

def __init__(node_name, name, age)

但是你只传了两个参数：

super().__init__(name, age)  # ❌ 缺了 node_name

因此报错。

修改后完整 `WriterNode`：

from demo_python_pkg.person_node import PersonNode

class WriterNode(PersonNode):
    def __init__(self, name: str, age: int, book: str) -> None:
        super().__init__('writer_node', name, age)  # ✅ 正确传入三个参数
        print('WriterNode 的 __init__ 函数被调用了')
        self.book = book

def main():
    import rclpy
    rclpy.init()
    node = WriterNode('法外狂徒张三', 18, '论快速入狱')
    node.eat('鱼香肉丝')
    rclpy.spin(node)
    rclpy.shutdown()

如果你还有其他 Node 的继承设计问题，或者希望 WriterNode 中动态传入 node_name，也可以优化，我们可以继续改。是否需要我帮你重构让 node_name 更灵活？