pip install安装报错

操作：pip install XXX

报错日志：Could not fetch URL https://pypi.python.org/simple/xlwt/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661) - skipping

  Could not find a version that satisfies the requirement xlwt (from versions: )

No matching distribution found for xlwt

解决办法：使用easy_install XXX