在python2.7环境下，使用anacoda安装jupyter notebook后，输入
jupyter notebook
无法打开jupyter，错误log如下：
The Jupyter HTML Notebook.
这将启动一个基于tornado的HTML笔记本服务器，它提供一个html5/
javascript笔记本客户端。
Traceback (most recent call last):
File "/anaconda2/envs/python3/bin/jupyter-notebook", line 11, in <module>
sys.exit(main())
File "/anaconda2/envs/python3/lib/python2.7/site-packages/jupyter_core/application.py", line 266, in launch_instance
return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
File "/anaconda2/envs/python3/lib/python2.7/site-packages/traitlets/config/application.py", line 657, in launch_instance
app.initialize(argv)
File "<decorator-gen-7>", line 2, in initialize
File "/anaconda2/envs/python3/lib/python2.7/site-packages/traitlets/config/application.py", line 89, in catch_config_error
app.print_help()
File "/anaconda2/envs/python3/lib/python2.7/site-packages/traitlets/config/application.py", line 385, in print_help
self.print_subcommands()
File "/anaconda2/envs/python3/lib/python2.7/site-packages/traitlets/config/application.py", line 377, in print_subcommands
print(os.linesep.join(lines))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 4: ordinal not in range(128)
Google后参考github上的一个issue，https://github.com/jupyterlab/jupyterlab/issues/5345，看到有人切换语言解决问题的：
屏幕快照 2019-01-07 下午5.20.07.png
于是尝试使用如下命令打开jupyter:
LANG=zn jupyter notebook
问题解决✅
