一

import turtle as t
color = ['red','green','blue','orange','pink']
for i in range(len(color)):
    t.penup()
    t.goto(-200+70*i,0)
    t.pendown()
    t.pencolor(color[i])
    t.circle(50, steps = 5)
t.done()

二

#在____________上补充代码
#不要修改其他代码

import random as r
import turtle as t
def drawSnake(angl):
    t.penup()
    t.goto(0,200)
    t.pendown()
    t.seth(-1*angl)
    for i in range(length):
        t.circle(radius, angl)
        t.circle(-radius, angl)

length, radius = 3, 40
r.seed(1)
color = ['red','blue','purple','black']
for i in range(len(color)):
    t.pencolor(r. choice (color))
    angl = r. randint (30, 180)
    drawSnake(angl)
t.done()

三

import turtle as t
for i in range(4):
    t.fd(200)
    t.left(90)
t.penup()
t.goto(100,0)
t.pendown()
t.pencolor('green'，'red')
t.pensize(5)
t.begin_fill()
t.circle(100) 
t.end_fill()
t.done()

四

import turtle as t
import random as r
color = ['red','blue','purple','black']
r.seed(1)
for j in range(4):
    t.pencolor(r.choice(color))
    t.penup()
    t.goto(r.randint(-100,100), r.randint(-100,100))
    t.pendown()
    ra = r.randint(50, 200)
    for i in range(1,5):
        t.fd(ra)
        t.seth(90*i)
t.done()

五

import turtle as t
import random as r

color = ['red','green','blue','purple','black']
r.seed(1)
for j in range(5):
    t.pencolor(color[r.randint(0,6)])
    t.penup()
    t.goto(r.randint(-100,100),r.randint(-100,100))
    t.pendown()
    t.circle(r.randint(10,30))

六

import turtle
n = 4
for j in range(n):
    turtle.pendown()
    for i in range(4):
        turtle.fd(40)
        turtle.right(90)
    turtle.penup()
    turtle.fd(80)
turtle.done()

七

import turtle as t
color = ['red','green','blue']
rs = [10,30,60]

for i in range(3):
    t.penup()
    t.goto(0, -rs[i])
    t. pendown()
    t.pencolor(color[i])
    t.circle(rs[i])
t.done()

八

import turtle as t
import random as r

r.seed(1)
t.pensize(2)
for i in range(3):
    length = r.randint(20, 80)
    x0 = r.randint(-100, 100)
    y0 = r.randint(-100, 100)
    t.penup()
    t.goto(x0, y0)
    t.pendown()
    for j in range(4):
        t.forward(length)
        t.setheading(90 * (j + 1))
t.done()

九

import turtle as t
import random as r
color = ['red','orange','blue','green','purple']
r.seed(1)
for i in range(5):
    rad = r.randint(20,50)
    x0 = r.randint(-100,100)
    y0 = r.randint(-100,100)
    t.color(r.choice(color))
    t.penup()
    t.goto(x0,y0)
    t.pendown()
    t.circle(rad)
t.done()