背景颜色

import turtle

pen = turtle.Turtle()
turtle.Screen().bgcolor("blue")
pen.color("cyan")
for i in range(10):
    for i in range(2):
        pen.forward(100)
        pen.right(60)
        pen.forward(100)
        pen.right(120)
        pen.right(36)

turtle.done()

画圆

import turtle

pen = turtle.Turtle()

pen.pencolor('red')                 # 设置画笔颜色
pen.fillcolor('red')                # 设置填充颜色

# pen.goto(-100, 150)                 # 移动画笔到坐标点(-100, 150)

pen.begin_fill()
turtle.circle(100, 80)


# pen.end_fill()
pen.hideturtle()
turtle.done()  # 结束绘画

太阳花

from turtle import *

color('red', 'yellow')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos()) < 1:
        break
    end_fill()
done()

树

import turtle


def y(sz, level):
    """  定义Y函数，sz表示是树的尺寸， level是树的层次级别 """
    if level > 0:
        #  按照树的层次级别(level)设置树的颜色
        pen.pencolor(0, 255 // level, 0)

        pen.forward(sz)

        pen.right(angle)

        #  递归调用y函数，绘制右边子树
        y(0.8 * sz, level - 1)

        pen.pencolor(0, 255 // level, 0)

        pen.left(2 * angle)

        #  递归调用y函数，绘制左边子树
        y(0.8 * sz, level - 1)

        pen.pencolor(0, 255 // level, 0)

        pen.right(angle)
        pen.forward(-sz)


# if __name__ == '__main__':
pen = turtle.Turtle()

# 设置绘图速度
pen.speed('fastest')

# 设置颜色模式为255，即颜色范围是0~255
turtle.colormode(255)

# 设置画笔朝向
pen.right(-90)

# 设置树杈角度
angle = 30

# 创建尺寸为80，层次级别是7的数
y(80, 7)

turtle.done()  # 结束绘画

椭圆

import turtle


def draw(rad):
    for i in range(2):
        turtle.circle(rad, 90)
        turtle.circle(rad // 2, 90)


turtle.seth(-45)
draw(150)
turtle.done()