Initializing/Changing Variables

[jassel41]

I am currently working on a program for a learning video game for students. The scenario right now is that they see a traffic light blinking incorrectly and are supposed to input appropriate timing constraints for the light. For now I have the lights blinking on a timing loop where two are simply invisible if the other is on.

I want to give the students the option to change the value of the variable controlling these lights, but I do not know how to initialize a variable to one value and then be able to change it later without it conflicting with the initialization statement.

Can anyone provide any tips on how to start with a variable at one value and then be able to give the user control to change it if they want without being reset by the first initialization statement?

Thank you
- Jassel41

[Jeff]

You can modify a variable within a function by using the global keyword. Here pressing the spacebar modifies a variable and then prints it.
import viz
import vizact

viz.go()

var = 1

def addTwo():
global var
var += 2
print var

vizact.onkeydown(' ',addTwo)