求助：安装Ryu时遇AttributeError，setuptools无get_script_args属性

尝试安装Ryu多日始终无法解决报错，工作陷入停滞，急需完成安装以推进工作。执行命令时出现如下错误：

fani@fani-VMware-Virtual-Platform:~/ryu$ pip install . --break-system-packages
Defaulting to user installation because normal site-packages is not writeable
Processing /home/fani/ryu
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [9 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/home/fani/ryu/setup.py", line 21, in <module>
          ryu.hooks.save_orig()
        File "/home/fani/ryu/ryu/hooks.py", line 36, in save_orig
          _main_module()._orig_get_script_args = easy_install.get_script_args
                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      AttributeError: module 'setuptools.command.easy_install' has no attribute 'get_script_args'
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

解决方法 #

• 降级setuptools到兼容版本：新版本setuptools移除了easy_install.get_script_args接口，Ryu旧代码依赖该接口。执行以下命令降级后重新安装Ryu：

  pip install setuptools==58.0.4 --break-system-packages
  pip install . --break-system-packages
  

• 使用虚拟环境隔离依赖：避免修改系统包，创建专属虚拟环境后安装：

  python -m venv ryu-env
  source ryu-env/bin/activate
  pip install .
  

• （不推荐）修改Ryu源码：找到/home/fani/ryu/ryu/hooks.py，注释掉或删除引用easy_install.get_script_args的相关代码，但可能引发其他兼容性问题。

内容的提问来源于stack exchange，提问作者farhan jatt