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import turtle
z=turtle.Turtle
'''shape:形状
speed:速度
circle:圆
square:正方形
triangle:三角形
classic:经典；默认
import 导入
turtle 海龟模块
right 向右
left 向左
pencolor 笔颜色
pensize 笔粗细
penup 抬笔
pendown 落笔
goto(x,y) 移动到坐标x，y
setx 设置x坐标
sety 设置y坐标
forward（) 前进
backward后退'''