How to calculate the factorial of n in python

The factorial of an integer (English: factorial) is the product of all positive integers less than and equal to the number, 0 The factorial is 1. That is: n!=1×2×3×...×n.

First import the math module, and then call the factorial() function to calculate the factorial.

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1 math.factorial(x)

import math value = math.factorial(x)

2. reduce function

def factorial(n): return reduce(lambda x,y:x*y,[1]+range(1,n+1))

3. Recursive implementation

def factorial(n): if n == 0: return 1 else: return n * factorial(n - 1)

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