jupyter-notebook 启动import libzmq error：DLL load failed windows系统

问题描述：windows 7 安装anaconda后启动jupyter notebook报错以下错误，重装miniconda后一样的效果

File "c:\users\xxx\appdata\local\programs\python\python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\xxx\appdata\local\programs\python\python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python39\Scripts\jupyter-notebook.EXE\__main__.py", line 4, in <module>
  File "c:\users\v\appdata\local\programs\python\python39\lib\site-packages\notebook\notebookapp.py", line 49, in <module>
    from zmq.eventloop import ioloop
  File "c:\users\xxx\appdata\local\programs\python\python39\lib\site-packages\zmq\__init__.py", line 50, in <module>
    _load_libzmq()
  File "c:\users\xxx\appdata\local\programs\python\python39\lib\site-packages\zmq\__init__.py", line 28, in _load_libzmq
    from . import libzmq
ImportError: DLL load failed while importing libzmq: The specified module could not be found.
      

解决方案：

卸载掉pyzmq，重装低版本的pyzmq

我的配置显示是安装的​

​20.0.1​

​版本的，退回​

​20.0.0​

​之后问题解决

pip uninstall pyzmq
pip install pyzmq==20.0.0
      

之后成功启动jupyter notebook

注：

之前有搜过大多博客写的是添加环境变量，大致思路就是把conda安装路径和conda下​

​library\bin​

​加入系统环境变量，没有效果