Errors and Warnings from Dependencies

Twisted: service_identity module

Warning like:

:0: UserWarning: You do not have a working installation of the service_identity module: 'cannot import name 'verify_ip_address' from 'service_identity.pyopenssl' (/usr/lib/python3.7/site-packages/service_identity/pyopenssl.py)'. Please install it from https://pypi.python.org/pypi/service_identity and make sure all of its dependencies are satisfied. Without the service_identity module, Twisted can perform only rudimentary TLS client hostname verification. Many valid certificate/hostname mappings may be rejected.

The "verify_ip_address" function is introduced in service_identity v. 18.1.0 so:

pip install 'service_identity>=18.1.0'