Python 安装 mitmproxy 报错：'str' object has no attribute 'decode'

报错：AttributeError: 'str' object has no attribute 'decode'

截取自报错文本：

    File "D:\Anaconda3\lib\site-packages\setuptools\msvc.py", line 192, in _msvc14_find_vc2017
      path = subprocess.check_output([
  AttributeError: 'str' object has no attribute 'decode'
  ----------------------------------------
  ERROR: Failed building wheel for urwid
  Running setup.py clean for urwid
Failed to build urwid
Installing collected packages: urwid, ruamel.yaml, pyperclip, pydivert, publicsuffix2, protobuf, passlib, ldap3, kaitaistruct, h2, Brotli, blinker, asgiref, mitmproxy
    Running setup.py install for urwid ... error

解决

出现了两次这样的错误，根据调用栈，我们来到 D:\Anaconda3\Lib\site-packages\setuptools\msvc.py，192 行，往下看到：

修改：

再次 pip install mitmproxy，前面的错误已经解决了，但是末尾再次报错。

报错：Cannot uninstall 'ruamel-yaml'

Installing collected packages: urwid, ruamel.yaml, pyperclip, pydivert, publicsuffix2, protobuf, passlib, ldap3, kaitaistruct, h2, Brotli, blinker, asgiref, mitmproxy
  Attempting uninstall: ruamel.yaml
    Found existing installation: ruamel-yaml 0.15.87
ERROR: Cannot uninstall 'ruamel-yaml'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

conda环境安装datapane报错ERROR: Cannot uninstall ‘ruamel-yaml‘_weixin_46115371的博客

这里，我是打算将 mitmproxy 安进 base 环境的，之前应该是作为依赖已经被安装过了。这里我们进入 D:\Anaconda3\Lib\site-packages，删除 ruamel 开头的文件夹和一个 .info 文件，再次重新安装 mitmproxy，成功。