Why Courier is the font of program codes?

As we all know VFX has to do with programming (basically everithing which is in connected with computers does). That's why this question arises
Is far as I know Courier font came from film making where the so called script or with an other word the screenplay is always written in Courier (size: 12 pt).

As a screenplay (or script) determines what will happen on stage or on screen, the programming script determines what will happen on the computer screen. Okay it's quite over simplfied explonation😃. But I think the reason of the Courier font is something like this. So whenever we see Courier font text and it is not film making context the text has to be program code

There is another explonation here:

https://www.quora.com/Why-do-some-programmers-use-the-Courier-typeface-in-coding