jupyter 切换conda 环境时候出现报找不到DLL模块的错误：
当在网上搜索了很多方法仍然不能解决jupyter notebook切换conda环境报错问题。 总结网上解决方法
- 添加conda环境变量
- 更新zmq包
如果以上两种办法都不能解决，conda环境还可以自己再配置，可以原则最后暴力的办法，彻底卸载，重装，而且conda包最好在官网下载。
我就是属于搞了很久解决不了，原因是我把conda配置弄乱了，所以我选择暴力解决，清除配置，彻底卸载，重新安装conda
彻底清除配置指令
anaconda-clean --yes
conda下载链接，这是下载个人版本
https://www.anaconda.com/products/individual
问题描述：
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\Scripts\jupyter-notebook-script.py", line 6, in
from notebook.notebookapp import main
File "C:\ProgramData\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 47, in
from zmq.eventloop import ioloop
File "C:\ProgramData\Anaconda3\lib\site-packages\zmq\__init__.py", line 47, in
from zmq import backend
File "C:\ProgramData\Anaconda3\lib\site-packages\zmq\backend\__init__.py", line 40, in
reraise(*exc_info)
File "C:\ProgramData\Anaconda3\lib\site-packages\zmq\utils\sixcerpt.py", line 34, in reraise
raise value
File "C:\ProgramData\Anaconda3\lib\site-packages\zmq\backend\__init__.py", line 27, in
_ns = select_backend(first)
File "C:\ProgramData\Anaconda3\lib\site-packages\zmq\backend\select.py", line 27, in select_backend
mod = __import__(name, fromlist=public_api)
File "C:\ProgramData\Anaconda3\lib\site-packages\zmq\backend\cython\__init__.py", line 6, in
from . import (constants, error, message, context,
ImportError: DLL load failed: 找不到指定的模块。
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