海龟画图：

漂亮的螺旋线

 

import turtle as t

t.bgcolor("black")
n=6
colors = ['red', 'green', 'blue', 'yellow','orange','purple']

for x in range(160):
    t.pencolor(colors[x%6])
    t.forward(x*5/n+x)
    t.left(360/n+1)
    t.width(x*n/200)
t.up()
t.left(-90)
t.forward(50)
t.down()
t.write("你好！学会了吗", font=('Arial', 16, 'normal'))
t.done()

2 黑白框

 

import turtle as t

t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.forward(-50)
t.left(90)
t.fillcolor("black")
t.begin_fill()
t.forward