給jupyter安裝目錄插件頻頻報錯(已解決)

起始

老師讓我們給jupyter安裝一個產檢，以顯示目錄，可以有更好的體驗。
我在安裝時老是出現超時的錯誤。

Traceback (most recent call last):
  File "d:\anaconda3\lib\site-packages\pip\_internal\cli\base_command.py", line 186, in _main
    status = self.run(options, args)
  File "d:\anaconda3\lib\site-packages\pip\_internal\commands\install.py", line 331, in run
    resolver.resolve(requirement_set)
  File "d:\anaconda3\lib\site-packages\pip\_internal\legacy_resolve.py", line 177, in resolve
    discovered_reqs.extend(self._resolve_one(requirement_set, req))
  File "d:\anaconda3\lib\site-packages\pip\_internal\legacy_resolve.py", line 333, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "d:\anaconda3\lib\site-packages\pip\_internal\legacy_resolve.py", line 282, in _get_abstract_dist_for
    abstract_dist = self.preparer.prepare_linked_requirement(req)
  File "d:\anaconda3\lib\site-packages\pip\_internal\operations\prepare.py", line 482, in prepare_linked_requirement
    hashes=hashes,
  File "d:\anaconda3\lib\site-packages\pip\_internal\operations\prepare.py", line 287, in unpack_url
    hashes=hashes,
  File "d:\anaconda3\lib\site-packages\pip\_internal\operations\prepare.py", line 159, in unpack_http_url
    link, downloader, temp_dir.path, hashes
  File "d:\anaconda3\lib\site-packages\pip\_internal\operations\prepare.py", line 303, in _download_http_url
    for chunk in download.chunks:
  File "d:\anaconda3\lib\site-packages\pip\_internal\utils\ui.py", line 160, in iter
    for x in it:
  File "d:\anaconda3\lib\site-packages\pip\_internal\network\utils.py", line 39, in response_chunks
    decode_content=False,
  File "d:\anaconda3\lib\site-packages\pip\_vendor\urllib3\response.py", line 564, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "d:\anaconda3\lib\site-packages\pip\_vendor\urllib3\response.py", line 529, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "d:\anaconda3\lib\contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "d:\anaconda3\lib\site-packages\pip\_vendor\urllib3\response.py", line 430, in _error_catcher
    raise ReadTimeoutError(self._pool, None, "Read timed out.")
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.

我反反覆覆一直嘗試，總是出現這個錯誤，難道我家的網已經差到這個地步啦嗎？？？

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第一步：安裝python軟件包

關於pip提供兩種方式：

pip install jupyter_contrib_nbextensions
	我使用這個命令時老師報錯超時，所以不是很建議使用這個。
	
或者

pip install https://github.com/ipython-contrib/jupyter_contrib_nbextensions/tarball/master
	可以從github項目的主分支下載安裝，成功概率較大。
	我就是使用這個成功安裝的。

第二步：安裝javascript和CSS文件

jupyter contrib nbextension install --user

第三步：進入jupyter

進入 jupyter notebook 
點擊 Nbextensions
勾上 Table of Contents
新建一個文件即可顯示目錄
可參考以下圖片。