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@小鱼最后靠着重装ros2，没改文件内容，解决了问题

LI

@小鱼 /opt/ros/humble/local/lib/python3.10/dist-packages/rosidl_generator_py/init.py是这样的

# Copyright 2014-2015 Open Source Robotics Foundation, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import logging
import traceback

from .import_type_support_impl import import_type_support

__all__ = ['import_type_support']

try:
    from .generate_py_impl import generate_py
    assert generate_py
    __all__.append('generate_py')
except ImportError:
    logger = logging.getLogger('rosidl_generator_py')
    logger.debug(
        'Failed to import modules for generating Python structures:\n' + traceback.format_exc())

尝试了那两行命令，仍旧是同样的报错

LI

@小鱼基本是复制下来的
msg:

string content
sensor_msgs/Image image

cmake.txt

cmake_minimum_required(VERSION 3.8)
project(demo_interface)

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

find_package(ament_cmake REQUIRED)

find_package(sensor_msgs REQUIRED)
find_package(rosidl_default_generators REQUIRED)

rosidl_generate_interfaces(${PROJECT_NAME}
  "msg/Novel.msg"
   DEPENDENCIES sensor_msgs
 )


if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  
  set(ament_cmake_copyright_FOUND TRUE)
  
  set(ament_cmake_cpplint_FOUND TRUE)
  ament_lint_auto_find_test_dependencies()
endif()

ament_package()

package.xml

<?xml version="1.0"?>
<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
<package format="3">
  <name>demo_interface</name>
  <version>0.0.0</version>
  <description>TODO: Package description</description>
  <maintainer email="li-xiaoqiang@outlook.com">li</maintainer>
  <license>TODO: License declaration</license>

  <buildtool_depend>ament_cmake</buildtool_depend>

  <test_depend>ament_lint_auto</test_depend>
  <test_depend>ament_lint_common</test_depend>

  <depend>sensor_msgs</depend>
  <build_depend>rosidl_default_generators</build_depend>
  <exec_depend>rosidl_default_runtime</exec_depend>
  <member_of_group>rosidl_interface_packages</member_of_group>


  <export>
    <build_type>ament_cmake</build_type>
  </export>
</package>

安装过anaconda，但编译的时候是关闭的，不在conda环境里。

LI

vm虚拟机，Ubuntu 22 + ros humble
按教程建立工作工作空间、msg文件夹、改写了cmake.txt以及 package.xml.
编译

colcon build --packages-select demo_interface

出现如下错误：

Starting >>> demo_interface
--- stderr: demo_interface                             
Traceback (most recent call last):
  File "/opt/ros/humble/share/rosidl_generator_py/cmake/../../../lib/rosidl_generator_py/rosidl_generator_py", line 8, in <module>
    from rosidl_generator_py import generate_py
ImportError: cannot import name 'generate_py' from 'rosidl_generator_py' (/opt/ros/humble/local/lib/python3.10/dist-packages/rosidl_generator_py/__init__.py)
gmake[2]: *** [demo_interface__py/CMakeFiles/demo_interface__py.dir/build.make:180：rosidl_generator_py/demo_interface/_demo_interface_s.ep.rosidl_typesupport_fastrtps_c.c] 错误 1
gmake[1]: *** [CMakeFiles/Makefile2:590：demo_interface__py/CMakeFiles/demo_interface__py.dir/all] 错误 2
gmake[1]: *** 正在等待未完成的任务....
gmake: *** [Makefile:146：all] 错误 2
---
Failed   <<< demo_interface [1.96s, exited with code 2]

Summary: 0 packages finished [2.37s]
  1 package failed: demo_interface
  1 package had stderr output: demo_interface

重要提示

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