@JerryNing --license Apache-2.0
首先用 VS Code 打开主目录下的 chapt2 文件，并打开集成终端，输入如下命令：
ros2 pkg create demo_python_pkg --build-type ament_python --license Apache-2.0
---
going to create a new package
package name: demo_python_pkg
destination directory: /home/fishros/chapt2
package format: 3
version: 0.0.0
description: TODO: Package description
maintainer: ['fishros <fishros@todo.todo>']
licenses: ['Apache-2.0']
build type: ament_python
dependencies: []
creating folder ./demo_python_pkg
creating ./demo_python_pkg/package.xml
creating source folder
creating folder ./demo_python_pkg/demo_python_pkg
creating ./demo_python_pkg/setup.py
creating ./demo_python_pkg/setup.cfg
creating folder ./demo_python_pkg/resource
creating ./demo_python_pkg/resource/demo_python_pkg
creating ./demo_python_pkg/demo_python_pkg/__init__.py
creating folder ./demo_python_pkg/test
creating ./demo_python_pkg/test/test_copyright.py
creating ./demo_python_pkg/test/test_flake8.py
creating ./demo_python_pkg/test/test_pep257.py
上述命令中ros2 pkg create是 ROS 2 命令行工具 pkg 模块下，用于创建功能包的命令 demo_python_pkg是功能包的名字，后面--build-type ament_python用于指定功能包的构建类型为ament_python，最后的--license Apache-2.0用于声明功能包的开源协议。
