def little_than_50(x):
if x <= 50:
return True
else:
return False
def calculate_factorial(x):
if x <= 1:
return 1
else:
return x*calculate_factorial(x-1)
while True:
n = int(input("Input a number for calculating factorial:"))
if little_than_50(n):
break
else:
print("{} is out of range,please input again!".format(n))
print("The factorial of {} is {}".format(n, calculate_factorial(n)))
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