Is there a way to find out if the python script is running in the IDLE interpreter or the terminal?

Works cross-platform if possible, or if needed a different way for each platform.

Work with Python 2 and Python 3 if possible, or if needed a different way for each version.

The only way I could think of is checking the processes running for IDLE but I don't know how to do that right.

If IDLE is open for another script and my script is running in the terminal, a process check would return true even if my script is not running in the IDLE.

My script needs to run differently depending on if it is running in IDLE or a terminal.

This seems to work on Python3/Linux

import sysprint("idlelib" in sys.modules)

If will return True if the script is run from Idle, False otherwise. Please test for other combination of Python/OS !