input()函数用于读取标准输入
注意：input函数的返回值类型为字符串

        >>> num=input("Please input a number:")
        Please input a number:32
        >>> type(num)
        

        >>> num1=input("Please input the number1:")
        Please input the number1:5
        >>> num2=input("Please input the number2:")
        >>> print("number1 + number2 =",(num1+num2))
        number1 + number2 = 53
        >>> print("number1 + number2 =",(int(num1)+int(num2)))
        number1 + number2 = 8

        >>> cus=input("Please input the custom name:")
        Please input the custom name:Tom
        >>> cid=input("Please input the custom ID:")
        Please input the custom ID:001
        >>> cus_info='''
                        custom_name:{0}
                        custom_id:{1}
                        '''.format(cus,cid)
        >>> print(cus_info)
        custom_name:Tom
        custom_id:001