Playing with pygame

ink.py

import pygame as p
from scipy.stats import poisson

run = True
max_r = 80
des_r = 35
paint = False

p.init()
sc = p.display.set_mode((1000, 1000))
sc.fill((255, 255, 255))
p.display.update()

while run:
    for event in p.event.get():
        if event.type == p.QUIT:
            run = False
        if event.type == p.KEYDOWN and event.key == p.K_ESCAPE:
            run = False
        if event.type == p.MOUSEBUTTONDOWN and event.button == 3:
            sc.fill((255, 255, 255))
        if event.type == p.MOUSEBUTTONDOWN and event.button == 1:
            paint = True
        if event.type == p.MOUSEBUTTONUP and event.button == 1:
            paint = False
        if event.type == p.MOUSEWHEEL:
            des_r += event.y
            if des_r < 1:
                des_r = 1
            print(des_r)
    rel = p.mouse.get_rel()
    dist = p.math.Vector2(rel).magnitude()
    if dist > 0:
        r = max_r / dist
        r = p.math.clamp(r, 0, des_r)
        r = poisson.rvs(mu=r)
        if paint:
            p.draw.circle(sc, 0, p.mouse.get_pos(), r)
    p.display.update()
p.quit()