[Linux][pip] CERTIFICATE_VERIFY_FAILED certificate verify failed 오류 해결

pip install을 하려는데 아래와 같은 로그가 남으면서 실패했다..

WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:727)'),)'

이럴땐 --trusted-host pypi.python.org --trusted-host files.pythonhosted.org --trusted-host pypi.org 옵션을 붙혀서 다시 명령을 내려보자!

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- 참고한 문서

https://github.com/pypa/pip/issues/5288

SSL Error on pip installations Win7 x64 · Issue #5288 · pypa/pip