week07.py

# Week 7: Turtle Art Gallery (Turtle Basics)
# Goal: Learn basic turtle commands - forward, right, goto, penup/pendown
# This program draws three squares at different positions on the screen.

import turtle

# Setup the screen (canvas)
screen = turtle.Screen()
screen.title("Turtle Art Gallery")

# Create a turtle (the drawing pen)
t = turtle.Turtle()
t.speed(6)  # Drawing speed: 1 (slow) to 10 (fast), 0 = instant

def draw_square(size):
    """
    Draw a square with the given side length.
    
    Args:
        size: Length of each side of the square
    """
    for _ in range(4):  # A square has 4 sides
        t.forward(size)  # Move forward by 'size' pixels
        t.right(90)      # Turn right 90 degrees (square corner)

# Draw first square at center (0, 0)
draw_square(60)

# Move to a new position WITHOUT drawing a line
t.penup()           # Lift the pen (stop drawing)
t.goto(120, 0)      # Move to coordinates (120, 0)
t.pendown()         # Put pen down (start drawing again)

# Draw second square at new position
draw_square(90)

# Move to another position
t.penup()
t.goto(-120, -80)   # Coordinates can be negative (left/down from center)
t.pendown()

# Draw third square
draw_square(40)

# Hide the turtle cursor (cleaner look)
t.hideturtle()

# Keep window open until clicked (important!)
screen.mainloop()