jupyter notebook中ipywidgets插件不显示

在 jupyter notebook中使用matplotlib.pyplot画图，如果不显示图片，比如只显示

类似的时，应首先检查代码的首行是否添加了

%matplotlib inline

如果没有，请添加这一句之后再试。如果还是不行，请查看以下内容：

 

【环境】mac / ubuntu / windows

【解决】

1，重新安装ipywidgets, widgetsnbextension 。在终端中执行：

pip install --upgrade --force-reinstall ipywidgets
# for windows cmd: pip install --upgrade --force-reinstall ipywidgets --user

pip install --upgrade --force-reinstall widgetsnbextension 
# for windows cmd: pip install --upgrade --force-reinstall widgetsnbextension --user

2，安装jupyter-js-widgets/extension，在终端中执行：

jupyter nbextension install --py widgetsnbextension
# for windows cmd: jupyter nbextension install --py widgetsnbextension --user

# 输出：
'''
Installing C:\Users\Lenovo\AppData\Roaming\Python\Python36\site-packages\widgetsnbextension\static -> jupyter-js-widgets
Making directory: C:\Users\Lenovo\AppData\Roaming\jupyter\nbextensions\jupyter-js-widgets\
Copying: C:\Users\Lenovo\AppData\Roaming\Python\Python36\site-packages\widgetsnbextension\static\extension.js -> C:\Users\Lenovo\AppData\Roaming\jupyter\nbextensions\jupyter-js-widgets\extension.js
Copying: C:\Users\Lenovo\AppData\Roaming\Python\Python36\site-packages\widgetsnbextension\static\extension.js.map -> C:\Users\Lenovo\AppData\Roaming\jupyter\nbextensions\jupyter-js-widgets\extension.js.map
- Validating: ok

    To initialize this nbextension in the browser every time the notebook (or other app) loads:

          jupyter nbextension enable widgetsnbextension --user --py
'''

 

3，在jupyter notebook中开启widgetsnbextension。在终端中执行：

jupyter nbextension enable --py widgetsnbextension --sys-prefix
# for windows cmd: jupyter nbextension enable --py widgetsnbextension --sys-prefix --user

# 输出如下：
# Enabling notebook extension jupyter-js-widgets/extension...
#       - Validating: OK

4，打开jupyter notebook。在终端中执行：

jupyter notebook

5，然后可以运行有widgets内容的代码。

-------------------------------------------------------------------报错及解决-------------------------------------------------------

第3步执行时报错：

$ jupyter nbextension enable --py widgetsnbextension --sys-prefix --user

Enabling notebook extension jupyter-js-widgets/extension...
Traceback (most recent call last):
  File "/home/xxx/.local/bin/jupyter-nbextension", line 8, in 
    sys.exit(main())
  File "/home/xxx/.local/lib/python3.6/site-packages/jupyter_core/application.py", line 268, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/home/xxx/.local/lib/python3.6/site-packages/traitlets/config/application.py", line 664, in launch_instance
    app.start()
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/nbextensions.py", line 988, in start
    super(NBExtensionApp, self).start()
  File "/home/xxx/.local/lib/python3.6/site-packages/jupyter_core/application.py", line 257, in start
    self.subapp.start()
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/nbextensions.py", line 896, in start
    self.toggle_nbextension_python(self.extra_args[0])
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/nbextensions.py", line 872, in toggle_nbextension_python
    logger=self.log)
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/nbextensions.py", line 483, in enable_nbextension_python
    logger=logger)
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/nbextensions.py", line 386, in _set_nbextension_state_python
    for nbext in nbexts]
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/nbextensions.py", line 386, in 
    for nbext in nbexts]
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/nbextensions.py", line 351, in _set_nbextension_state
    cm.update(section, {"load_extensions": {require: state}})
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/config_manager.py", line 136, in update
    self.set(section_name, data)
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/config_manager.py", line 110, in set
    self.ensure_config_dir_exists()
  File "/home/xxx/.local/lib/python3.6/site-packages/notebook/config_manager.py", line 67, in ensure_config_dir_exists
    os.makedirs(self.config_dir, 0o755)
  File "/usr/lib/python3.6/os.py", line 210, in makedirs
    makedirs(head, mode, exist_ok)
  File "/usr/lib/python3.6/os.py", line 210, in makedirs
    makedirs(head, mode, exist_ok)
  File "/usr/lib/python3.6/os.py", line 220, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/usr/etc'

解决：去掉 --sys-prefix 即可

$ jupyter nbextension enable --py widgetsnbextension --user

--------------------------------------------------------------------------------------------------------------------------------

【致谢】

minrk @ https://github.com/jupyter/notebook/issues/1731

landryshuai @ https://github.com/jupyter-widgets/ipywidgets/issues/1146

https://stackoverflow.com/questions/47396512/jupyter-widget-does-not-appear-in-notebook

http://cn.voidcc.com/question/p-adstwnju-ve.html

https://www.soinside.com/question/ZtKAd9hv5PCjCabNUp6mxA