AttributeError: module ‘lib’ has no attribute ‘X509_V_FLAG_CB_ISSUER_CHECK’

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Edit the crypto.py file mentioned in the stacktrace and remove the offending line by commenting it out with a #

Then upgrade latest version of PyOpenSSL.

pip install pip --upgrade
pip install pyopenssl --upgrade

Now you can re-add the commented line again and it should be working

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