三步解决python PermissionError: [WinError 5]拒绝访问的情况
问题描述：
1.当你卸载python库的时候，如：pip uninstall pandas
2.当你想要更新python库的时候，如：pip install --upgrade pandas
等等… 就会出现PermissionError: [WinError 5] 问题
废话不多说，分三步完全解决该问题：
第一步：
关闭跟python相关的所有程序，如jupyter，pycharm，Anaconda等等，这一步非常重要！！！
好了，第一步完成下面开始常规操作的两步：
第二步：
赋予用户对python的“完全控制”的权限，步骤如下：
找到按照python的位置，本文用的是Anaconda，安装在D盘，位置为：D:\Anaconda3。找到python->右键->属性->安全->点击“组或用户名”中的Users->编辑->点击点击“组或用户名”中的Users->把“完全控制”打钩->应用->OK
第三步：
执行完第二步一般就能解决问题。如果还没解决问题的话，请执行第三部，找到你安装python的文件夹，本人用的是Anaconda3，那么就直接对该文件夹（本人安装位置为D:\Anaconda3），右键属性，按照第二步的方法执行一遍就OK了！
当然，如果你用的pycharm或其他软件安装的python，那么就找到你安装位置的那个文件夹，同理右键->属性，执行第二步的方法， 搞定！
**总结：**一定要关闭所有跟python相关的程序！
补充知识：jupyter notebook_启动出错_ValueError: Please install nodejs 5+ and npm before continuing installation.
错误描述：
在启动jupyter notebook的时候虽然能进入Home，但是后台还是报错,如下：
[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/?token=14172d7abed02b6a0b816a
51fa29f6b44929d2f96b8a1b7f
[I 11:03:21.342 NotebookApp] Use Control-C to stop this server and shut down all
kernels (twice to skip confirmation).
[C 11:03:21.350 NotebookApp]
Copy/paste this URL into your browser when you connect for the first time,
to login with a token:
http://localhost:8888/?token=14172d7abed02b6a0b816a51fa29f6b44929d2f96b8
a1b7f
[I 11:03:21.581 NotebookApp] Accepting one-time-token-authenticated connection f
rom ::1
[I 11:15:21.364 NotebookApp] Interrupted...
[I 11:15:21.366 NotebookApp] Shutting down 0 kernels
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
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