Jupyter安裝nbextensions，啓動提示沒有nbextensions庫

錯誤日誌

ModuleNotFoundError: No module named 'jupyter_nbextensions_configurator'

    Traceback (most recent call last):
      File "/usr/local/Cellar/jupyterlab/2.0.1/libexec/lib/python3.7/site-packages/notebook/notebookapp.py", line 1670, in init_server_extensions
        mod = importlib.import_module(modulename)
      File "/usr/local/Cellar/jupyterlab/2.0.1/libexec/lib/python3.7/importlib/__init__.py", line 127, in import_module
        return _bootstrap._gcd_import(name[level:], package, level)
      File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
      File "<frozen importlib._bootstrap>", line 983, in _find_and_load
      File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
    ModuleNotFoundError: No module named 'jupyter_nbextensions_configurator'

分析原因

nbextensions已經安裝成功，但是啓動jupyter的時候，提示"No module named 'jupyter_nbextensions_configurator"，而且notebook的首頁也沒有nbextensions標籤。

網上搜索了很多文章，嘗試過很多方法，甚至卸載jupyter重新安裝也不行。

於是決定還是從錯誤日誌入手，既然提示沒有module，第一行也給了一個路徑/usr/local/Cellar/jupyterlab/2.0.1/libexec/lib/python3.7/site-packages/，反正死馬當活馬醫，在這個路徑下再安裝jupyter_nbextensions_configurator試試

pip3 install --target=/usr/local/Cellar/jupyterlab/2.0.1/libexec/lib/python3.7/site-packages jupyter_contrib_nbextensions

結果還真解決了，啓動的時候沒有提示錯誤，標籤也正常顯示