No local packages or working download links found for pbr python

用pip安装模块的时候，报如下错误：

Complete output from command python setup.py egg_info: Download error on https://pypi.org/simple/pbr/: unknown url type: https -- Some packages may not be found! Couldn't find index page for 'pbr' (maybe misspelled?) Download error on https://pypi.org/simple/: unknown url type: https -- Some packages may not be found! No local packages or working download links found for pbr

【No local packages or working download links found for pbr】原因是没有pbr模块。
解决方法：