pip 安装graphviz

pip安装graphviz时报如下错:

ERROR: Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host=’files.pythonhosted.org’, port=443): Max retries exceeded with url: /packages/17/51/d6de512dbbbab95f0adb53fb2a4396b79722f7c3fbe8ecc2d8c6ab7de00a/graphviz-0.12-py2.py3-none-any.whl (Caused by SSLError(SSLError(1, ‘[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)’),))

解决:

pip install graphviz –trusted-host=pypi.python.org –trusted-host=pypi.org –trusted-host=files.pythonhosted.org

参考:

https://github.com/pypa/pip/issues/5363