To simplify this it is similar to, 
({'rhel': ( {'rhct6': ( {'rhct65': ( {'rhct65_a': 'x86_64', 'rhct65_v': '6.5', 'rhct65_n': 'Red Hat CloudForms Tools for RHEL 6 RPMs x86_64 6.5'}), 
                               'rhct6S': ( {'rhct6S_a': 'x86_64', 'rhct6S_n': 'Red Hat CloudForms Tools for RHEL 6 RPMs x86_64 6Server', 'rhct6S_v': '6Server'})})})})