I found package python-six-1.9.0-1.el7 on cbs.centos.org, while it is not contained in the base repository in my centos 7.Is CBS a package repo like others, such as mirrors.mit.edu/centos? If so, can I set CBS as a repo to be accessed by yum?
Can I use CentOS CBS as yum's base repository?
centos;yum
Probably not.That site looks like a koji build server, and poking around in here for example does not show any of the metadata directories created by createrepo or such necessary for yum to act on. A yum list shows python-six in the base repo for Centos 7, so to pull in a more recent version (plus any deps) you would probably need to maintain a local yum repository (yum -y install createrepo and etc., more work for you) or find some other repository that hosts more up-to-date versions of those packages (less work but risks random breakage, depending on maintainer of external repo).