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.circle(50)
turtle.penup()
turtle.goto(120,0)
turtle.pendown()
turtle.color("black")
turtle.circle(50)
turtle.goto(120,0)
turtle.pendown()
turtle.color("black")
turtle.circle(50)
turtle.penup()
turtle.goto(240,0)
turtle.pendown()
turtle.goto(240,0)
turtle.pendown()
turtle.color("red")
turtle.circle(50)
turtle.circle(50)
turtle.penup()
turtle.goto(240,0)
turtle.pendown()
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)
