[W 11:03:21.011 NotebookApp] Error loading server extension jupyterlab
 Traceback (most recent call last):
 File "E:\Anaconda3\lib\site-packages\jupyterlab\commands.py", line 321, in
 __init__
 self._run(['node', 'node-version-check.js'], cwd=HERE, quiet=True)
 File "E:\Anaconda3\lib\site-packages\jupyterlab\commands.py", line 1165, i
n _run
 proc = Process(cmd, **kwargs)
 File "E:\Anaconda3\lib\site-packages\jupyterlab\process.py", line 73, in _
_init__
 self.proc = self._create_process(cwd=cwd, env=env)
 File "E:\Anaconda3\lib\site-packages\jupyterlab\process.py", line 131, in
_create_process
 cmd[0] = which(cmd[0], kwargs.get('env'))
 File "E:\Anaconda3\lib\site-packages\jupyterlab\jlpmapp.py", line 59, in w
hich
 raise ValueError(msg)
 ValueError: Please install nodejs 5+ and npm before continuing installation.
 nodejs may be installed using conda or directly from the nodejs website.
 
 During handling of the above exception, another exception occurred:
 
 Traceback (most recent call last):
 File "E:\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 1454,
in init_server_extensions
 func(self)
 File "E:\Anaconda3\lib\site-packages\jupyterlab\extension.py", line 111, i
n load_jupyter_server_extension
 info = get_app_info(app_dir)
 File "E:\Anaconda3\lib\site-packages\jupyterlab\commands.py", line 244, in
 get_app_info
 handler = _AppHandler(app_dir, logger)
 File "E:\Anaconda3\lib\site-packages\jupyterlab\commands.py", line 324, in
 __init__
 raise ValueError(msg)
 ValueError: Please install nodejs 5+ and npm before continuing installation.
 nodejs may be installed using conda or directly from the nodejs website.
[I 11:03:21.336 NotebookApp] Serving notebooks from local directory: C:\Users\Ad
ministrator\Desktop\shuju
[I 11:03:21.338 NotebookApp] 0 active kernels
[I 11:03:21.339 NotebookApp] The Jupyter Notebook is running at:
[I 11:03:21.340 NotebookApp] http://localhost:8888/"color: #ff00ff">解决方案：

因为我的电脑上安装了Anaconda，所以我打开Anacoda后

等待系统安装，完成后在cmd命令行中再次输入jupyter notebook,问题解决


以上这篇三步解决python PermissionError: [WinError 5]拒绝访问的情况就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。