Bug with python mode

Processing.py
3

Try using the ‘global’ keyword inside the draw function.
This keyword is to be used if you want to assign the value of an initialized global variable inside a function.

txt = '1';

def setup():
    size(600,600)
    noFill()
    noStroke()

def draw():
    global txt
    fill('#FF0000') # red quadrant
    rect(width/2,0, width/2,height/2)

    fill('#004477') # blue quadrant
    rect(0,0, width/2,height/2)

    fill('#6633FF') # violet quadrant
    rect(0,height/2, width/2,height/2)

    fill('#FF9900') # orange quadrant
    rect(width/2,height/2, width/2,height/2)
    
    fill(255)
    if mouseX < width/2 and mouseY < height/2:
        #text("BLUE",mouseX,mouseY)
        txt = 'BLUE'
    if mouseX < width/2 and mouseY > height/2:
        #text("PURPLE",mouseX,mouseY)
        txt = 'PURPLE'
    if mouseX > width/2 and mouseY < height/2:
        #text("RED",mouseX,mouseY)
        txt = 'RED'
    if mouseX > width/2 and mouseY > height/2:
        #text("YELLOW",mouseX,mouseY)
        txt = 'YELLOW'
    text(txt,mouseX,mouseY)
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