python: pip install pandas error

#报错：
Could not fetch URL https://pypi.python.org/simple/numpy/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661) - skipping
Could not find a version that satisfies the requirement numpy (from versions: )
No matching distribution found for numpy

## solution
using domestic mirroring
PIP install PANDAS -i  http://pypi.douban.com/simple/  --trusted-Host  pypi.douban.com