jupyter启动报错module 'lib' has no attribute 'X509_-_FLAG_CB_ISSUER_CHECK'如何解决

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jupyter notebook

windows11启动报错======

Traceback (most recent call last):

 File "D:\Anaconda3-5.3.1-Windows-x86_64\Scripts\jupyter-notebook-script.py", line 6, in <module>

   from notebook.notebookapp import main

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\notebook\notebookapp.py", line 82, in <module>

   from .services.contents.manager import ContentsManager

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\notebook\services\contents\manager.py", line 17, in <module>

   from nbformat import sign, validate as validate_nb, ValidationError

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\nbformat\__init__.py", line 33, in <module>

   from .validator import validate, ValidationError

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\nbformat\validator.py", line 12, in <module>

   from jsonschema import ValidationError

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\jsonschema\__init__.py", line 18, in <module>

   from jsonschema.validators import (

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\jsonschema\validators.py", line 8, in <module>

   import requests

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\requests\__init__.py", line 95, in <module>

   from urllib3.contrib import pyopenssl

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\urllib3\contrib\pyopenssl.py", line 46, in <module>

   import OpenSSL.SSL

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\OpenSSL\__init__.py", line 8, in <module>

   from OpenSSL import crypto, SSL

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\OpenSSL\crypto.py", line 1550, in <module>

   class X509StoreFlags(object):

 File "D:\Anaconda3-5.3.1-Windows-x86_64\lib\site-packages\OpenSSL\crypto.py", line 1570, in X509StoreFlags

   CB_ISSUER_CHECK = _lib.X509_-_FLAG_CB_ISSUER_CHECK

AttributeError: module 'lib' has no attribute 'X509_V_FLAG_CB_ISSUER_CHECK'

解决办法：======

pip uninstall pyOpenSSL

pip install pyOpenSSL

问题解决。

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