Python学习笔记6函数和代码复用

1、函数

（1）定义：

（2）函数调用

（3）函数的参数传递

参数传递的两种方式：函数调用时，参数可以按照位置或名称的方式传递

（4）函数的返回值

(5)局部变量和全局变量

（6）lambda函数

2、实例：七段数码管的绘制

 import turtle
 def drawLine(draw):
     turtle.pendown() if draw else turtle.penup()
     turtle.fd(40)
     turtle.right(90)
 def drawDigit(digit):
     drawLine(True) if digit in [2,3,4,5,6,8,9] else drawLine(False)
     drawLine(True) if digit in [0,1,3,4,5,6,7,8,9] else drawLine(False)
     drawLine(True) if digit in [0,2,3,5,6,8,9] else drawLine(False)
     drawLine(True) if digit in [0,2,6,8] else drawLine(False)
     turtle.left(90)
     drawLine(True) if digit in [0,4,5,6,8,9] else drawLine(False)
     drawLine(True) if digit in [0,2,3,5,6,7,8,9] else drawLine(False)
     drawLine(True) if digit in [0,1,2,3,4,7,8,9] else drawLine(False)
     turtle.left(180)
     turtle.penup()
     turtle.fd(20)
 def drawDate(date):
     for i in date :
         drawDigit(eval(i))
 def main():
     turtle.setup(800,350,200,200)
     turtle.penup()
     turtle.fd(-300)
     turtle.pensize(5)
     drawDate('')
     turtle.hideturtle()
     turtle.done()
 main()

运行结果：

 import turtle,time
 def drawGap():
     turtle.penup()
     turtle.fd(5)
 def drawLine(draw):
     drawGap()
     turtle.pendown() if draw else turtle.penup()
     turtle.fd(40)
     drawGap()
     turtle.right(90)
 def drawDigit(digit):
     drawLine(True) if digit in [2,3,4,5,6,8,9] else drawLine(False)
     drawLine(True) if digit in [0,1,3,4,5,6,7,8,9] else drawLine(False)
     drawLine(True) if digit in [0,2,3,5,6,8,9] else drawLine(False)
     drawLine(True) if digit in [0,2,6,8] else drawLine(False)
     turtle.left(90)
     drawLine(True) if digit in [0,4,5,6,8,9] else drawLine(False)
     drawLine(True) if digit in [0,2,3,5,6,7,8,9] else drawLine(False)
     drawLine(True) if digit in [0,1,2,3,4,7,8,9] else drawLine(False)
     turtle.left(180)
     turtle.penup()
     turtle.fd(20)
 def drawDate(date):
     turtle.pencolor("red")
     for i in date :
         if i == '-':
             turtle.write("年",font=("Arial", 18, "normal"))
             turtle.pencolor("green")
             turtle.fd(40)
         elif i == '=':
             turtle.write("月",font=("Arial", 18, "normal"))
         elif i == '+':
             turtle.write("日",font=("Arial", 18, "normal"))
         else:
             drawDigit(eval(i))
 def main():
     turtle.setup(800,350,200,200)
     turtle.penup()
     turtle.fd(-300)
     turtle.pensize(5)
     drawDate(time.strftime("%Y-%m=%d+",time.gmtime()))
     #drawDate('20181010')
     turtle.hideturtle()
     turtle.done()
 main()

运行结果：（不知道问题出在哪里了）