Pydev in Eclipse on Mac

When you downloaded Pydev for Eclipse, you have to set up the Python interpreter before you can start using it. Here is the instruction.

To configure a Python or Jython interpreter in 
Eclipse > Preferences > PyDev



When you are in Preferences, find PyDev, and click on the Interpreter - Python



Choose New in the upper right and enter /usr/bin/python
Eclipse will then take care of the rest for you – ie. updating the $PYTHONPATH

Reference & Credit: On Using Pydev on a Mac.