请教个python编程中1个简单问题

请教个python编程中1个简单问题？

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def fac(num):

if num > 1:

#在此处调整代码

result = num

for i in range (1, num):

result = result * i

return result

else:

return 1

number = int(input('Please input a natural number:'))

answer = fac(number)

print('The factorial of %d is %d.'%(number,answer))

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