turtle 入门教程笔记

画个太阳：

import turtle

t = turtle.Turtle()
t.speed(0)

r = 60
ray_len = 40
count = 12

# 太阳本体
t.color("orange", "yellow")
t.penup()
t.goto(0, -r)
t.pendown()
t.begin_fill()
t.circle(r)
t.end_fill()

# 光芒：从圆内一点出发，确保视觉接触
t.color("orange")
for i in range(count):
    t.penup()
    t.goto(0, 0)
    t.setheading(i * 360 / count)
    t.forward(r + 5)          # 往圆内缩 3，确保和圆边重叠
    t.pendown()
    t.forward(ray_len + 5)    # 相应多画 3，总长度不变

turtle.done()

三角形：

import turtle
t = turtle.Turtle()
t.color("green")

for i in range(3):
    t.forward(100)
    t.left(120)  # 360/3=120

turtle.done()

import turtle
t = turtle.Turtle()
t.speed(0)
colors = ["red", "orange", "yellow", "green"]
for i in range(4):
    t.pencolor(colors[i])
    t.forward(150)
    t.left(90)
turtle.done()

import turtle
t = turtle.Turtle()
t.speed(0)
colors = ["red", "orange", "yellow", "green", "blue", "purple"]
for i in range(6):
    t.pencolor(colors[i])
    t.penup()
    t.goto(0, -i * 25)
    t.pendown()
    t.circle(25 + i * 25)
turtle.done()

笑脸：

import turtle

t = turtle.Turtle()
t.speed(0)
turtle.bgcolor("lightyellow")

# 画脸（黄色大圆）
t.penup()
t.goto(0, -100)
t.pendown()
t.pencolor("orange")
t.fillcolor("yellow")
t.begin_fill()
t.circle(100)
t.end_fill()

# 左眼
t.penup()
t.goto(-35, 30)
t.pendown()
t.pencolor("black")
t.fillcolor("black")
t.begin_fill()
t.circle(10)
t.end_fill()

# 右眼
t.penup()
t.goto(35, 30)
t.pendown()
t.begin_fill()
t.circle(10)
t.end_fill()

# 嘴巴（一段向下的弧）
t.penup()
t.goto(-50, -10)
t.pendown()
t.pencolor("black")
t.setheading(-60)      # 朝右下
t.circle(60, 120)      # 画 120 度的弧，就是微笑

turtle.done()