今日在安装 pip install pandas_datareader 的时候，显示：
collecting pandas_datareader
Could not fetch URL https://pypi.python.org/simple/pandas-datareader/: There was a problem confirming
the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749) - skipping
Could not find a version that satisfies the requirement pandas_datareader (from versions: )
No matching distribution found for pandas_datareader
解决方法：
使用国内镜像地址，
pip install pandas_datareader -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
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