If you are facing issue where pip chooses python3 over python2.7, then you need to use the correct alternative. Follow the following steps:

1. First install pip for python2 and python3

   sudo zypper install python-pip python3-pip

2. Choose the correct version

   sudo update-alternatives --config pip

   The following will be displayed

   There are 2 choices for the alternative pip (providing /usr/bin/pip).
   Selection Path Priority Status
   ------------------------------------------------------------
   * 0 /usr/bin/pip3.4 30 auto mode
    1 /usr/bin/pip2.7 20 manual mode
    2 /usr/bin/pip3.4 30 manual mode
   Press enter to keep the current choice[*], or type selection number:

3. Type 1 (option infront of pip2.7) and press Enter