IDLE executes without f5

[wmsrite]

I'm adding a camera to my Pi. Here's the code I'm trying to write in IDLE3

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from picamera import PiCamera
from time import sleep
camera = PiCamera()
camera.start_preview()
sleep(10)
camera.stop_preview()

However, once i hit enter on

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camera.start_preview()

the IDLE3 editor runs the program and the camera takes over the display. I never get a chance to enter the last 2 lines which would limit the camera preview. I'm not hitting F5, but it's acting like I am. Is this a setting or a bug? Anyone know how to fix this?

[wmsrite]

I wrote the program in Geany and then opened it in ILDE3 and it worked perfectly. So obviously this is an ILDE issue. Why would it execute the command before the program is finished being written? How can I stop this?

[Douglas6]

IDLE has a REPL (Read-Evaluate-Print Loop). It executes each line as it is entered. You want to use the menu to open a new (or existing) file, which can be executed all at once with F5.

[wmsrite]

I thought I was opening a new file. I go to the menu, click on new file, save the file as camera.py and then start writing. Is there a different option for opening a new file?

I'm familiar with REPL's. I use them in Node.js.

How do I open a new file that has the REPL turned off?

[dgordon42]

How do I open a new file that has the REPL turned off?

Start IDLE, and select File -> New File.
This will open a second window.
This second window is a plane text editor where you enter your Python program. You can distinguish it from the Python REPL by the lack of the Python prompt (>>>) at the start of each line.
After you have entered your program, save it, and then run it using the 'F5' function key.

Hope this helps,
Dave.