Python Turtle Graphics: Introduction, Concepts, and Multiple Example Programs

Python's turtle module is a built‑in graphics library that lets users control a virtual turtle to draw on a canvas, making it an excellent tool for learning basic programming concepts such as loops, conditionals, and functions.

The name "turtle graphics" comes from the Logo language, where a turtle metaphor was used to simplify the teaching of programming and drawing on a two‑dimensional plane.

Below is a detailed example that creates a canvas, sets the background color, configures the turtle's speed and pen color, draws a five‑pointed star, a circle, and then finishes the drawing.

<code>import turtle

# 设置画布和海龟
screen = turtle.Screen()
screen.bgcolor("white")  # 设置画布背景颜色
t = turtle.Turtle()
t.speed(1)  # 设置海龟移动速度
t.color("blue")  # 设置画笔颜色

# 画一个五角星
for i in range(5):
    t.forward(100)  # 海龟向前移动100个单位
    t.right(144)    # 海龟向右转144度

# 画一个圆形
t.penup()  # 提起笔，移动海龟不留痕迹
t.goto(0, -50)  # 将海龟移动到指定位置
t.pendown()  # 放下笔，开始绘图
t.circle(50)  # 画一个半径为50的圆

# 隐藏海龟
t.hideturtle()

# 结束绘图，等待用户关闭窗口
turtle.done()</code>

The resulting drawing shows a blue star and a circle on a white background.

Additional examples illustrate how to draw a square, a colorful spiral, a filled circle, a Tai Chi symbol, a simple car, a five‑pointed star with fill, a colorful spiral, a colored square, a spiral line, a rose, and a multi‑part Doraemon figure. Each example includes the full source code wrapped in ... tags and a brief description of the visual result.

These examples demonstrate how adjusting the turtle's path, speed, and colors can produce a wide variety of interesting graphics, reinforcing concepts such as iteration, function definition, and coordinate handling.

At the end of the article, promotional material invites readers to scan a QR code to obtain free Python learning resources, but the core educational content remains focused on turtle graphics programming.