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))
