Processing drizzle translated into python

processing.py

# original source: https://github.com/ian-bateman/generative_art/tree/master/drizzle

import random
import sys

DROPLETS = []
N_DROPLETS = 4000
BLUE_COUNT = None
BLUE_UP = None

class Droplet:
    def __init__(self, x, y):
        self.x1 = x
        self.y1 = y
        self.x2 = None
        self.y2 = None
        self.vel = 4
        self.radius = 300
        self.y_offset = y1
        self.accel = random.randrange(0.01, 0.04)
        self.c = color(random.randrage(140, 200), random.randrange(140, 200), 255)

    def draw_particle(self):
        self.update_particle()
        stroke(self.c)
        strokeWeight(3.5)

    def update_particle(self):
        if self.y1 > height:
            self.vel = 4
            self.x1 = random.randrange(width)
            self.y1 = random.randrange(0 - height, 0)
            self.x2 = self.x1
            self.y2 = self.y1
            self.y_offset = self.y1
            self.accel = random.randrange(0.001, 0.004)
            self.y1 = self.vel + self.y_offset
            
        self.vel += random.randrange(1 + self.accel, 4 + self.accel)
        self.accel += self.accel * random.randrange(0.01, 0.04)

        self.x2 = self.x1
        self.y2 = self.y1

        self.y1 = self.vel + self.y_offset
        line(self.x1, self.y1, self.x2, self.y2)

def setup_seed():
    seed = random.randrange(sys.maxint)
    print('Seed is {}'.format(seed))
    random.random(seed)

def setup():
    setup_seed()
    size(1536, 768)
    smooth(8)
    background(0)
    BLUE_COUNT = 0
    BLUE_UP = True
    for _ in range(N_DROPLETS):
        DROPLETS.append(Droplet(random.randrange(width), random.randrange(0 - height, 0)))

def draw():
    noStroke()
    fill(0, BLUE_COUNT / 4, BLUE_COUNT, 15)
    if BLUE_UP:
        BLUE_COUNT += 1
        if BLUE_COUNT >= 120:
            BLUE_UP = not BLUE_UP
        else:
            BLUE_COUNT -= 1
            if BLUE_UP <= 80:
                BLUE_UP = not BLUE_UP
    rect(0, width, height)

    for droplet in DROPLETS:
        droplet.draw_particle()