rospy module init_node fails?

edit

I'm attempting to write a simple python node, but I can't even seem to get rospy imported into my script. Even just the import statement (after running chmod +x [filename]) fails. I'm unable to run the tutorial python nodes as well. What are the possible reasons why this could be happening? I've been able to get a node running just fine on C++.

My (snipped) code, for reference:

#!/usr/bin/env python
import rospy

def main():
    rospy.init_node("arm_gui")

main()

And the full error text:

rosrun SCARA_test_1 random.py
Traceback (most recent call last):
  File "/home/mint/Documents/catkin_ws/src/SCARA_test_1/scripts/random.py", line 3, in <module>
    import rospy
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/__init__.py", line 49, in <module>
    from .client import spin, myargv, init_node, \
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/client.py", line 46, in <module>
    import random
  File "/home/mint/Documents/catkin_ws/src/SCARA_test_1/scripts/random.py", line 34, in <module>
    main()
  File "/home/mint/Documents/catkin_ws/src/SCARA_test_1/scripts/random.py", line 30, in main
    rospy.init_node("arm_gui")
AttributeError: 'module' object has no attribute 'init_node'

EDIT: Additional system info:

OS: Linux Mint 17.1 (Based on ubuntu 14.04)

ROS: Indigo

PYTHONPATH: /home/mint/Documents/catkin_ws/devel/lib/python2.7/dist-packages:/opt/ros/indigo/lib/python2.7/dist-packages