Jupyter Lab无法打开终端窗口的解决方法
作者：DeepHao
错误描述
本地Anaconda使用pip install jupyterlab后使用jupyter-lab打开窗口创建Terminal出现错误Launcher Error、Unhandled error、Dismiss
解决方案
通过查询Anaconda窗口信息发现报错如下：
Traceback (most recent call last):
File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\tornado\web.py", line 1702, in _execute
result = method(*self.path_args, **self.path_kwargs)
File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\tornado\web.py", line 3173, in wrapper
return method(self, *args, **kwargs)
File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\jupyter_server\terminal\api_handlers.py", line 26, in post
name, _ = self.terminal_manager.new_named_terminal(**data)
File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\terminado\management.py", line 319, in new_named_terminal
term = self.new_terminal(**kwargs)
File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\terminado\management.py", line 171, in new_terminal
pty = PtyProcessUnicode.spawn(argv, env=env, cwd=options.get('cwd', None))
File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\winpty\ptyprocess.py", line 89, in spawn
'executable: %s.' % command
FileNotFoundError: The command was not found or was not executable: powershell.exe.
可以发现报错的原因是JupyterLab在创建Ternimal时无法定位到PowerShell。为此，我通过CMD启用PowerShell仍然失败，如下所示：
因此怀疑时是环境变量中缺少`PowerShell`路径，因此我找到`PowerShell`路径并添加至环境变量，如下所示
完成后在CMD中输入PowerShell即可进入PowerShell模式
此时打开Anaconda启动JupyterLab，即可正常启动Terminal，如下所示：
总结
如果在Win10平台使用JupyterLab无法正常启动Terminal且报错为FileNotFoundError: The command was not found or was not executable: powershell.exe.，只需要在环境变量中添加PowerShell路径
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