用python代码举例讲解一下

Python是一种面向对象的编程语言，可以用来创建很多不同类型的应用程序。例如，要使用Python编写一个计算器应用程序，可以使用以下代码：def add(x, y):
return x + ydef subtract(x, y):
return x - ydef multiply(x, y):
return x * ydef divide(x, y):
return x / ynum1 = int(input("请输入第一个数字："))
num2 = int(input("请输入第二个数字："))print("选择运算：")
print("1.加")
print("2.减")
print("3.乘")
print("4.除")choice = input("输入你的选择（1/2/3/4）：")if choice == '1':
print(num1,"+",num2,"=", add(num1,num2))elif choice == '2':
print(num1,"-",num2,"=", subtract(num1,num2))elif choice == '3':
print(num1,"*",num2,"=", multiply(num1,num2))elif choice == '4':
print(num1,"/",num2,"=", divide(num1,num2))else:
print("无效的输入")