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IDLE is the Python development environment.
Can't Open IDLE
You need to “kill” all the idle processes. A dangerous shortcut is
It will give you a warning message but usually works
Or, you can say
Which shows you all (-a) the processes. Then, kill the process by their ids (PID)
IDLE Shell Won't Get New Input
If the IDLE shell is acting weird with the prompts when they want to run something (like it's still executing another program), just hit enter a few times or control-c to cancel that and then execute the program again.
IDLE Exits When Program Executes
If IDLE is exiting completely when a program executes, then try opening the Python program in jEdit and then executing the program on the command-line/in a terminal. After testing in jEdit, try again in IDLE.