:: $ yum install openssl-devel vim $ vim /etc/yum.repos.d/puias-computational.repo Paste the following code into the above file :: [PUIAS_6_computational] name=PUIAS computational Base $releasever - $basearch mirrorlist=http://puias.math.ias.edu/data/puias/computational/$releasever/$basearch/mirrorlist gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-puias Download and import the Repo GPG key:: $ cd /etc/pki/rpm-gpg/ $ wget -q http://springdale.math.ias.edu/data/puias/6/x86_64/os/RPM-GPG-KEY-puias $ rpm --import RPM-GPG-KEY-puias $ yum install python27 python27-devel python27-libs python27-setuptools