在键盘上输入数n，编程计算sum=1!+2!+··· + n!的结果。 要求： (1)在源程序中有包含姓名等信息的注释。

在Python中，我们可以编写一个简单的函数来计算阶乘之和。首先，在源程序中添加一些注释，包括作者的信息。下面是实现该功能的一个例子：

# coding: utf-8
# Author: 张三 (<NAME>)
# This program calculates the sum of factorials from 1 to a given number n

def factorial_sum(n):
    """
    Calculate the sum of factorials up to n.
    
    Args:
        n (int): The upper limit for calculating factorials.

    Returns:
        int: Sum of factorials from 1 to n inclusive.
    """
    # Initialize the sum and define a function for calculating factorials
    def factorial(num):
        if num == 0 or num == 1:
            return 1
        else:
            return num * factorial(num - 1)

    # Compute and accumulate the sum of factorials
    total = sum(factorial(i) for i in range(1, n + 1))
    return total

# To use the function, input the desired value for n
n = int(input("Enter a number n: "))
result = factorial_sum(n)
print(f"The sum of factorials from 1 to {n} is: {result}")

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