WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by ‘SSLError(SSLCertVerificationError(1, ‘[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:992)’))’: /simple/matplotlib/

python -m pip install something --trusted-host pypi.python.org --trusted-host files.pythonhosted.org --trusted-host pypi.org