In Python, math module contains a number of mathematical operations, which can be performed with ease using the module. math.factorial() function returns the factorial of desired number.
Syntax: math.factorial(x) Parameter: x: This is a numeric expression. Returns: factorial of desired number. Time Complexity: O(n) where n is the input number. Auxiliary space: O(1)
Code #1:
Python3
# Python code to demonstrate the working of factorial() # importing "math" for mathematical operationsimport math x = 5 # returning the factorialprint ("The factorial of 5 is : ", end ="")print (math.factorial(x)) |
Output:
The factorial of 5 is : 120
Code #2:
Python3
# Python code to demonstrate the working of factorial()# importing "math" for mathematical operationsimport mathx = 5y = 15z = 8# returning the factorialprint ("The factorial of 5 is : ", math.factorial(x))print ("The factorial of 15 is : ", math.factorial(y))print ("The factorial of 8 is : ", math.factorial(z)) |
Output:
The factorial of 5 is : 120 The factorial of 15 is : 1307674368000 The factorial of 8 is : 40320
Code #3: Throws ValueError if x is not integer
Python3
# Python code to demonstrate the working of factorial() # importing "math" for mathematical operationsimport math # when x is not integerprint ("math.factorial(13.7) : ", math.factorial(13.7)) |
Output:
ValueError: factorial() only accepts integral values
