from pyprocessing import *

size(900,600)
background(1, 1, 1)
strokeWeight(6)
x1 = 0
y1 = 0
x2 = 0
y2 = 0
x = [0,0,0]
y = [0,0,0]

def draw():
    if mouse.pressed:
        x1 = mouse.x
        y1 = mouse.y
        if mouse.pressed:
            x2 = pmouse.x
            y2 = pmouse.y
            stroke(x1,y1,1)
            line(x1, y1, x2, y2)
run()