大学慕课中的数码管程序

看了大学慕课，上面有一段数码管的程序。

 1 import turtle
 2 def drawLine(draw):
 3     turtle.pendown() if draw else turtle.penup()
 4     turtle.fd(40)
 5     turtle.right(90)
 6 
 7 def drawDigit(digit):
 8     drawLine(True) if digit in [2,3,4,5,6,8,9] else drawLine(False)
 9     drawLine(True) if digit in [0,1,3,4,5,6,7,8,9] else drawLine(False)
10     drawLine(True) if digit in [0,2,3,5,6,8,9] else drawLine(False)
11     drawLine(True) if digit in [0,2,6,8] else drawLine(False)
12     turtle.left(90)
13     drawLine(True) if digit in [0,4,5,6,8,9] else drawLine(False)
14     drawLine(True) if digit in [0,2,3,5,6,7,8,9] else drawLine(False)
15     drawLine(True) if digit in [0,1,2,3,4,7,8,9] else drawLine(False)
16     turtle.left(180)
17     turtle.penup()
18     turtle.fd(20)
19 
20 def drawDate(date):
21     for i in date:
22         drawDigit(eval(i))
23 
24 def main():
25     turtle.setup(800, 350, 200, 200)
26     turtle.penup()
27     turtle.fd(-300)
28     turtle.pensize(5)
29     drawDate("20181010")
30     turtle.hideturtle()
31     turtle.done()
32 main()