1. 适当的空格
逻辑行首的空白表示逻辑表示层次关系 从而决定分组
语句从新行的第一列开始
风格统一 都用四个空格
不能随便加空格
奥运五环
#绘制奥运五环
import turtle
turtle.width(10)
turtle.color("blue")
turtle.circle(50)
turtle.penup()
turtle.goto(120,0)
turtle.pendown()
turtle.color("black")
turtle.circle(50)
turtle.penup()
turtle.goto(240,0)
turtle.pendown()
turtle.color("red")
turtle.circle(50)
turtle.penup()
turtle.goto(240,0)
turtle.pendown()
turtle.penup()
turtle.goto(60,-50)
turtle.pendown()
turtle.color("yellow")
turtle.circle(50)
turtle.penup()
turtle.goto(180,-50)
turtle.pendown()
turtle.color("green")
turtle.circle(50)