练习 mypy019

1. 导入模块
2. 定义点坐标：系列解包
3. 绘制折线路径
4. 计算起点到终点的距离
5. 标注距离：turtle.write(distance )

         开方：导入math模块  math.sqrt()

import turtle

x1,y1 = 100,100
x2,y2 = 100,-100
x3,y3 = -100,-100
x4,y4 = -100,100

turtle.penup()
turtle.goto(x1,y1)
turtle.pendown()
turtle.goto(x2,y2)
turtle.goto(x3,y3)
turtle.goto(x4,y4)

import math
distance = math.sqrt((x1-x4)**2 + (y1-y4)**2)

turtle.write(distance)