python基础编程_20_阶乘

Python练习题问题如下：

提问：求1+2!+3!+...+20!的和

方法一:

sumValue = 0
t = 1
for n in range(1,11):
    t *= n
    sumValue += t
print ('1! + 2! + 3! + ... + 10! = %d' % sumValue)

方法二:

s = 0
myarray = range(1,11)
def myfunction(x):
    r = 1
    for i in range(1,x + 1):
        r *= i
    return r
sumValue = sum(map(myfunction,myarray))
print ('1! + 2! + 3! + ... + 10! = %d' % sumValue)

1! + 2! + 3! + ... + 10! = 4037913