Python之turtle画同心圆和棋盘

import turtle

t = turtle.Pen()

for i in range(5):
    t.penup()
    t.goto(0, -i*30)
    t.pendown()
    t.circle(i*30+30)

turtle.done()

import turtle

t = turtle.Pen()

widthall = 200
width = 20
num = widthall // 20 * 2 + 1

t.speed(10)

for r in range(num):
    t.penup()
    t.goto(-widthall, widthall - width * r)
    t.pendown()
    t.goto(widthall, widthall - width * r)

for c in range(num):
    t.penup()
    t.goto(-widthall + width * c, widthall)
    t.pendown()
    t.goto(-widthall + width * c, -widthall)

turtle.done()