Tested on RHEL 7 (actual RHEL, not CentOS), got TLS 1.2 for both:

    $ python2 --version
    Python 2.7.5
    $ python2 -c "import json, urllib2; print json.load(urllib2.urlopen('https://www.howsmyssl.com/a/check'))['tls_version']"
    TLS 1.2

    $ python3 --version
    Python 3.4.5
    $ python3 -c "import json, urllib.request; print(json.loads(urllib.request.urlopen('https://www.howsmyssl.com/a/check').read().decode('UTF-8'))['tls_version'])"
    TLS 1.2