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#### 海龟绘图

# 导入turtle包的所有内容:
from turtle import *

# 设置笔刷宽度:
width(4)

# 前进:
forward(200)
# 右转90度:
right(90)

# 笔刷颜色:
pencolor('red')
forward(100)
right(90)

pencolor('green')
forward(200)
right(90)

pencolor('blue')
forward(100)
right(90)

# 调用done()使得窗口等待被关闭，否则将立刻关闭窗口:
done()


turtle包本身只是一个绘图库，但是配合Python代码，就可以绘制各种复杂的图形。例如，通过循环绘制5个五角星：

from turtle import *

def drawStar(x, y):
pu()
goto(x, y)
pd()
seth(0)
for i in range(5):
fd(40)
rt(144)

for x in range(0, 250, 50):
drawStar(x, 0)

done()


from turtle import *

# 设置色彩模式是RGB:
colormode(255)

lt(90)

lv = 14
l = 120
s = 45

width(lv)

# 初始化RGB颜色:
r = 0
g = 0
b = 0
pencolor(r, g, b)

penup()
bk(l)
pendown()
fd(l)

def draw_tree(l, level):
global r, g, b
# save the current pen width
w = width()

# narrow the pen width
width(w * 3.0 / 4.0)
# set color:
r = r + 1
g = g + 2
b = b + 3
pencolor(r % 200, g % 200, b % 200)

l = 3.0 / 4.0 * l

lt(s)
fd(l)

if level < lv:
draw_tree(l, level + 1)
bk(l)
rt(2 * s)
fd(l)

if level < lv:
draw_tree(l, level + 1)
bk(l)
lt(s)

# restore the previous pen width
width(w)

speed("fastest")

draw_tree(l, 4)

done()


rect.py

starts.py

tree.py