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Python method to find the factorial of an integer n: 1. First import the math module, and then use math.factorial(n) to calculate the factorial of n; 2. Use the reduce() function to find the factorial; 3. Through recursion Let’s find the factorial.
The factorial of an integer (English: factorial) is the product of all positive integers less than and equal to the number. The factorial of 0 is 1. That is: n!=1×2×3×...×n.
1. Use math.factorial(x)
First import the math module, and then call the factorial() function to calculate the factorial.
import math value = math.factorial(x)
2. Use the 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)
Recommended learning: Python video Tutorial
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