尝试在虚拟环境中使用 ipywidgets 时 npm 不起作用

Question

我在服务器上使用 python 虚拟环境。现在我正在尝试使用 ipywidgets 和显示。这是我的环境有：

看来我已经安装了 jupyter、nodejs 和 npm。

然后我安装

看起来不错。

然后我安装：

现在我正在尝试安装：

你可以看到关于 npm 的错误。

日志信息为：

Node v12.16.3

Yarn configuration loaded.
> /bin/npm pack @jupyter-widgets/jupyterlab-manager@2.0
npm ERR! code UNABLE_TO_VERIFY_LEAF_SIGNATURE
npm ERR! errno UNABLE_TO_VERIFY_LEAF_SIGNATURE
npm ERR! request to https://registry.npmjs.org/@jupyter-widgets%2fjupyterlab-manager failed, reason: unable to verify the first certificate

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/fefechen/.npm/_logs/2020-05-25T04_59_34_698Z-debug.log

Traceback (most recent call last):

  File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/debuglog.py", line 47, in debug_logging
yield

  File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/labextensions.py", line 93, in start
ans = self.run_task()

  File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/labextensions.py", line 149, in run_task
for i, arg in enumerate(self.extra_args)
......
      File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/labextensions.py", line 149, in <listcomp>
for i, arg in enumerate(self.extra_args)

  File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/commands.py", line 388, in install_extension
return handler.install_extension(extension, pin=pin)

  File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/commands.py", line 603, in install_extension
info = self._install_extension(extension, tempdir, pin=pin)

  File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/commands.py", line 1499, in _install_extension
info = self._extract_package(extension, tempdir, pin=pin)

  File "/scratch/feng/py36env/lib64/python3.6/site-packages/jupyterlab/commands.py", line 1578, in _extract_package
raise ValueError(msg % source)

ValueError: "@jupyter-widgets/jupyterlab-manager@2.0" is not a valid npm package

Exiting application: jupyter

那么，如何处理这个问题：ValueError: "@jupyter-widgets/jupyterlab-manager@2.0" is not a valid npm package

Answer 1

这是因为防火墙。我运行在我的本地计算机上使用相同的代码，很好

Answer 2

我为此苦苦挣扎，最终放弃了 conda，然后是 pipenv，即使在计算机全局环境中完全按照安装说明进行操作后，问题仍然存在；防火墙 on/off 等

显然有很多人遇到了这个问题，不幸的是有很多答案。我尝试了很多，通过蛮力发现了以下内容：

jupyter lab paths

... 打印出 jupyter 的环境所在的位置。当您 cd 到 C:\Users\<username>\.jupyter\lab 和运行相同的 jupyter labextension install @jupyter-widgets/jupyterlab-manager 安装命令时，我得到一个可爱的旋转反斜杠，它闪烁了 30 秒，最终 returns 一条模棱两可的消息 Building jupyterlab assets (build:prod:minimize) .

您可以检查以确保安装了：jupyter labextension list，在我的例子中输出了：

Known labextensions:
   app dir: c:\python38\share\jupyter\lab
        @jupyter-widgets/jupyterlab-manager v2.0.0 enabled  ok

很抱歉，现在已经太晚了，我无法继续设置虚拟环境，但我希望这指向正确的方向，并为其他人节省 3-4 小时的无效谷歌搜索:-P

尝试在虚拟环境中使用 ipywidgets 时 npm 不起作用

npm does not work when trying to use ipywidgets in a virtual environment

virtualenv

node.js

npm

jupyter

display