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）

巴特西

Python学习笔记6函数和代码复用

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