def factorial(n):

if n == 1:

return 1

else:

return n*factorial(n-1)

def SumFactorial(m):

if m ==1 :

return factorial(1)

else:

return factorial(m) + SumFactorial(m-1)

m = 20

print(SumFactorial(m))

Python實現輸出1*2*3*4*5····100的和

階乘，程式碼如下。

multiply = 1

for i in range(1, 101):

multiply *= i

print(sum(range(1, 101)))

有階乘函式:improtnumpyprintnumpy.math.factorial(3)python自帶的標準庫也有階乘函式importmathprintmath.factorial(3)