【Python】【求从1到10的阶乘】

求1！+ 2！+ 3！...+10！的结果

def fac(k):
    i = 2
    t = 1
    while i <= k:
        t *= i
        i = i + 1
    return t
def sum(n):
    s = 0
    i = 1
    while i <= n:
        s = s + fac(i)
        i += 1
    return s
print('1!+2!+3!+...10!=',sum(10))