用pip安装tornado库:
python -m pip install tornado
出现问题一: Could not fetch URL https://pypi.org/simple/twisted/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host=‘pypi.org‘, port=443): Max retries exceeded with url: /simple/twisted/ (Caused by SSLError("Can‘t connect to HTTPS URL because the SSL module is not available.")) - skipping
解决办法:python -m pip install tornado --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org
即在库名后+ --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org
出现问题二:pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host=‘files.pythonhosted.org‘, port=443): Read timed out.
解决办法:python -m pip install --default-timeout=100 tornado --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.
原文地址:https://www.cnblogs.com/qihuang94/p/12115639.html