sudo apt-cache policy python3.4
python3.4:
  Installed: 3.4.3-1ubuntu1~14.04.1
  Candidate: 3.4.3-1ubuntu1~14.04.1
  Version table:
 *** 3.4.3-1ubuntu1~14.04.1 0
        100 /var/lib/dpkg/status
     3.4.0-2ubuntu1.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     3.4.0-2ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages