pip安装xxx库出现问题：
比如，xxx是pandas
(py37) user@node01:~$ pip install pandasLooking in indexes: https://pypi.tuna./simpleWARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:748)'),)': /simple/pandas/WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:748)'),)': /simple/pandas/WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:748)'),)': /simple/pandas/WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:748)'),)': /simple/pandas/WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:748)'),)': /simple/pandas/Could not fetch URL https://pypi.tuna./simple/pandas/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.tuna.', port=443): Max retries exceeded with url: /simple/pandas/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:748)'),)) - skippingERROR: Could not find a version that satisfies the requirement pandasERROR: No matching distribution found for pandas
解决方式：
pip install xxx -i /simple --trusted-host
其中，xxx是你要安装的库
