Documentation for undocumented Pong Code

Here is the provided code with added NumPy-style docstrings to document various parts of the code for clarity:

python
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import turtle

# Create a turtle screen.
win = turtle.Screen()
win.title("Pong by Your Name")
win.bgcolor("black")
win.setup(width=1000, height=500)

# Create the left paddle.
left_paddle = turtle.Turtle()
left_paddle.speed(0)
left_paddle.shape("square")
left_paddle.color("white")
left_paddle.shapesize(stretch_wid=6, stretch_len=1)
left_paddle.penup()
left_paddle.goto(-450, 0)

# Create the right paddle.
right_paddle = turtle.Turtle()
right_paddle.speed(0)
right_paddle.shape("square")
right_paddle.color("white")
right_paddle.shapesize(stretch_wid=6, stretch_len=1)
right_paddle.penup()
right_paddle.goto(450, 0)

# Create the ball.
ball = turtle.Turtle()
ball.speed(40)
ball.shape("square")
ball.color("white")
ball.penup()
ball.goto(0, 0)
ball.dx = 6  # Initialize the horizontal velocity of the ball.
ball.dy = -2  # Initialize the vertical velocity of the ball.

# Initialize scores for left and right players.
score_left = 0
score_right = 0

# Create a score display turtle.
score_display = turtle.Turtle()
score_display.speed(0)
score_display.color("white")
score_display.penup()
score_display.hideturtle()
score_display.goto(0, 210)
score_display.write("Left: 0  Right: 0", align="center", font=("Courier", 24, "normal"))

# Define functions to move the left paddle up and down.
def left_paddle_up():
    """
    Move the left paddle upwards within a certain range.
    """
    y = left_paddle.ycor()
    if y < 250:
        left_paddle.sety(y + 20)

def left_paddle_down():
    """
    Move the left paddle downwards within a certain range.
    """
    y = left_paddle.ycor()
    if y > -240:
        left_paddle.sety(y - 20)

# Define functions to move the right paddle up and down.
def right_paddle_up():
    """
    Move the right paddle upwards within a certain range.
    """
    y = right_paddle.ycor()
    if y < 250:
        right_paddle.sety(y + 20)

def right_paddle_down():
    """
    Move the right paddle downwards within a certain range.
    """
    y = right_paddle.ycor()
    if y > -240:
        right_paddle.sety(y - 20)

I've added docstrings to describe the purpose of each function and provided comments for variable initialization and setup steps. This should make the code more readable and understandable.