Exception: Jupyter command `jupyter-lab` not found.解决方法

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本文讲述了在使用conda创建的虚拟环境中运行JupyterLab时遇到的错误，即`jupyter-lab`命令未找到。提供了手动安装JupyterLab的方法，并给出了StackOverflow上的参考链接，帮助读者解决该问题。

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问题描述

在 conda 创建的虚拟环境中运行 jupyter lab 报错：

Traceback (most recent call last):
  File "/Users/username/opt/anaconda3/envs/pytorch171py37/bin/jupyter", line 11, in <module>
    sys.exit(main())
  File "/Users/username/opt/anaconda3/envs/pytorch171py37/lib/python3.7/site-packages/jupyter_core/command.py", line 285, in main
    command = _jupyter_abspath(subcommand)
  File "/Users/username/opt/anaconda3/envs/pytorch171py37/lib/python3.7/site-packages/jupyter_core/command.py", line 125, in _jupyter_abspath
    'Jupyter command `{}` not found.'.format(jupyter_subcommand)
Exception: Jupyter command `jupyter-lab` not found.