python第二章课后习题

2.1温度转换
temp = eval(input('''请输入温度：
 '''))
c = input("请输入符号：")
if c in ['F','f']:
    temp = int((temp-32)/1.8)
    print("温度：{}".format(temp))
elif c in ['c','C']:
    temp = int(temp*1.8+32)
    print("温度：{}".format(temp))
else:
    print("error")
2.2汇率
temp = eval(input('''请输入金额：
 '''))
c = input("请输入币种：")
if c == 'RMB':
    temp = int(temp/6)
    print("$：{}".format(temp))
elif c == '$':
    temp = int(temp*6)
    print("RMB：{}".format(temp))
else:
print("error")
2.3画乌龟
import turtle
def draw(r,ag,len):
    turtle.seth(-40)
   # for i in range(int(len)):
    turtle.pencolor("blue")
    turtle.circle(r,ag)
    turtle.circle(-r,ag)
    turtle.pencolor("green")
    turtle.circle(r,ag)
    turtle.circle(-r,ag)
    turtle.pencolor("pink")
    turtle.circle(r,ag)
    turtle.circle(-r,ag)
    turtle.pencolor("red")
    turtle.circle(r,ag)
    turtle.circle(-r,ag)
    turtle.circle(r,ag/2)
    turtle.fd(40)
    turtle.circle(16,180)
    turtle.fd(40*2/3)
turtle.setup(650,350,200,200)
turtle.penup()
turtle.fd(-250)
turtle.pendown()
turtle.pensize(25)
draw(40,80,4)
turtle.done()


2.4
画
from turtle import *
setup(300,400,0,0)
fd(100)
left(120)
fd(100)
left(120)
fd(100)

或者

from turtle import *
setup(300,400,0,0)
fd(100)
seth(120)
fd(100)
seth(240)
fd(100)

或者

from turtle import *
setup(300,400,0,0)
circle(200,steps = 3)
    


2.5

from turtle import *
setup(300,400,0,0)
fd(200)
seth(120)
fd(200)
seth(240)
fd(200)
seth(0)
fd(100)
seth(60)
fd(100)
seth(180)
fd(100)
seth(-60)
fd(100)


2.6

from turtle import *
setup(300,400,0,0)
for i in range(4):
    penup()
    fd(50)
    pendown()
    fd(100)
    penup()
    fd(50)
left(90)
2.8

from turtle import *
setup(1000,1400,0,0)
a=20
for i in range(20):
    a = a+2*i
    fd(a)
    left(90)
    fd(a)
    left(90)

2.7

from turtle import *
seth(30)
fd(200)
left(120)
fd(200)
left(120)
fd(200)
left(90)
t=(200/3)*pow(3,0.5)
penup()
fd(t)
pendown()
left(90)
fd(200)
left(120)
fd(200)
left(120)
fd(200)