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install Havana on centos7,python version does not support.

i try to install Havana on centos7,the default python version is 2.7.so i use pyenv to set the current environment to 2.6.but it still show an error.

[root@localhost ~]# python

Python 2.6.6 (r266:84292, Apr 29 2016, 13:35:28) [GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux3 Type "help", "copyright", "credits" or "license" for more information.

[root@localhost ~]# yum install -y openstack-nova python-novaclient

Error: Package: python-requests-1.1.0-4.el6.noarch (RedHat-OpenStack-Havana) Requires: python(abi) = 2.6 Installed: python-2.7.5-16.el7.x86_64 (@anaconda) python(abi) = 2.7 python(abi) = 2.7 Available: python-2.6.6-51.el6.x86_64 (local-source) python(abi) = 2.6 Error: Package: 1:libguestfs-tools-c-1.20.11-2.el6.x86_64 (RedHat-OpenStack-Havana) Requires: libguestfs = 1:1.20.11-2.el6 Installed: 1:libguestfs-1.28.1-1.18.el7.x86_64 (@anaconda) libguestfs = 1:1.28.1-1.18.el7 Available: 1:libguestfs-1.20.11-2.el6.x86_64 (RedHat-OpenStack-Havana) libguestfs = 1:1.20.11-2.el6

so,how to install Havana on centos7 ?