Mac under Pycharm set Python version

Installed the Pycharm 5.0.1, created the test project, found that the Python version is 2.6.9, the system has a version of 2.7, why, how to switch to 2.7

To see what version of the system was installed.

There are two versions.

Next set the path of the interpreter

Pycharm>preferences>build,excution,deployment>console>python Console

Set external libraries

Pycharm>project: Project name >project interpreter

Set up, look, have switched to version 2.7.10, this is the current version of the system, I have used the PIP installed a lot of Third-party library version