raining_all_day.py

import turtle
import random

window = turtle.Screen()
window.bgcolor("light blue")
window.title("It's raining all day today here…")
window.tracer(0)

width = window.window_width()
height = window.window_height()

rain_speed = 10
rain_length = 20

raindrop_colours = [
    "white",
    "gainsboro",
    "light gray",
    "silver",
    "alice blue",
    "white smoke",
    "powder blue",
]

x_boundary_left = -width // 2 - width // 5
x_boundary_right = width // 2

# initialise (empty) list
many_raindrops = []

# create turtles and place them in list
# we cannot have multiple turtles with the same name, and we do not want to
# have to create different names for each one
for repeat in range(200):
    raindrop = turtle.Turtle()
    raindrop.color(random.choice(raindrop_colours))
    raindrop.penup()
    raindrop.pensize(random.randint(2, 4))
    raindrop.right(90)  # turtle faces downwards
    raindrop.left(10)  # give rain another orientation (wind)

    # place at top of screen, but random y positions
    # out of the screen so that not all rain drops are in same line
    raindrop.sety(random.randint(height // 2, height * 4))
    # but random x coord
    raindrop.setx(random.randint(x_boundary_left, x_boundary_right))
    raindrop.pendown()
    raindrop.hideturtle()
    many_raindrops.append(raindrop)

while True:
    # iterate through the list: for each raindrop in raindrops do the following
    for raindrop in many_raindrops:
        # move raindrop forward at desired speed
        raindrop.forward(rain_speed)
        raindrop.clear()
        # draw raindrop (as line)
        raindrop.forward(rain_length)
        raindrop.forward(-rain_length)

        if raindrop.ycor() < -height // 2:  # if raindrop has hit the ground
            raindrop.penup()
            raindrop.setx(
                random.randint(
                    x_boundary_left, x_boundary_right
                )
            )
            raindrop.sety(height // 2)
            raindrop.pendown()
    window.update()