How to manage variables in RAM?

Question

Computers

Here is the crux of the matter.
Let's say in python I create a MyChar variable,

MyChar = "hello world"
while True:
    print(MyChar)

Is it possible somehow, not through python, not through code, to change the value of this variable?
THOSE. perhaps through a terminal, or through some utility, or even in Linux or Windwos there is a special dispatcher.
I saw a video on YouTube maybe half a year ago, I wanted to watch it, but I lost it :)
Thanks if anyone can help.

Answer 1

Any program that can open and edit the memory of another process will do. WinHex, ArtMoney, whatever