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

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