27、Python 函数与模块化编程全解析

Python 函数与模块化编程全解析

一、程序输出示例与功能选择

在编程中，我们常常会遇到需要用户选择不同功能的情况。下面是一个简单的程序示例，它提供了计算圆和矩形的面积、周长等功能选项：

MENU
1) Area of a circle
2) Circumference of a circle
3) Area of a rectangle
4) Perimeter of a rectangle
5) Quit
Enter your choice: 1 [Enter]
Enter the circle's radius: 10
The area is 314.159265359
MENU
1) Area of a circle
2) Circumference of a circle
3) Area of a rectangle
4) Perimeter of a rectangle
5) Quit
Enter your choice: 2 [Enter]
Enter the circle's radius: 10
The circumference is 62.8318530718
MENU
1) Area of a circle
2) Circumference of a circle
3) Area of a rectangle
4) Perimeter of a rectangle
5) Quit
Enter your choice: 3 [Enter]
Enter the rectangle's width: 5
Enter the rectangle's length: 10
The area is 50
MENU
1)