MKDocs服务的Python 3.9错误

问题描述

升级到Python 3.9后，运行mkdocs serve时遇到这些错误，我不是开发人员。我使用MKDocs建立了一个文档站点，并且想升级该软件，因此不得不升级Python，pip，mkdocs和mkdocs-material。

INFO    -  Cleaning site directory 
Traceback (most recent call last):
  File "/usr/local/bin/mkdocs",line 8,in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.9/site-packages/click/core.py",line 829,in __call__
    return self.main(*args,**kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/core.py",line 782,in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/site-packages/click/core.py",line 1259,in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/site-packages/click/core.py",line 1066,in invoke
    return ctx.invoke(self.callback,**ctx.params)
  File "/usr/local/lib/python3.9/site-packages/click/core.py",line 610,in invoke
    return callback(*args,**kwargs)
  File "/usr/local/lib/python3.9/site-packages/mkdocs/__main__.py",line 133,in serve_command
    serve.serve(
  File "/usr/local/lib/python3.9/site-packages/mkdocs/commands/serve.py",line 141,in serve
    config = builder()
  File "/usr/local/lib/python3.9/site-packages/mkdocs/commands/serve.py",line 136,in builder
    build(config,live_server=live_server,dirty=dirty)
  File "/usr/local/lib/python3.9/site-packages/mkdocs/commands/build.py",line 263,in build
    nav = get_navigation(files,config)
  File "/usr/local/lib/python3.9/site-packages/mkdocs/structure/nav.py",line 102,in get_navigation
    items = _data_to_navigation(nav_config,files,line 157,in _data_to_navigation
    return [
  File "/usr/local/lib/python3.9/site-packages/mkdocs/structure/nav.py",line 158,in <listcomp>
    _data_to_navigation(item,config)[0]
  File "/usr/local/lib/python3.9/site-packages/mkdocs/structure/nav.py",line 150,line 153,in <listcomp>
    Section(title=key,children=_data_to_navigation(value,config))
  File "/usr/local/lib/python3.9/site-packages/mkdocs/structure/nav.py",line 164,in _data_to_navigation
    file = files.get_file_from_path(path)
  File "/usr/local/lib/python3.9/site-packages/mkdocs/structure/files.py",line 31,in get_file_from_path
    return self.src_paths.get(os.path.normpath(path))
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/posixpath.py",line 336,in normpath
    path = os.fspath(path)
TypeError: expected str,bytes or os.pathLike object,not nonetype```

解决方法

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