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Python: Factorial of a number using itertools module

Python Itertools: Exercise-20 with Solution

Write a Python program to find the factorial of a number using itertools module.

Sample Solution:

Python Code:

import itertools as it
import operator as op

def factorials_nums(n):
    result = list(it.accumulate(it.chain([1], range(1, 1 + n)), op.mul))
    return result;
    
 
print("Factorials of 5 :", factorials_nums(5))
print("Factorials of 9 :", factorials_nums(9))

Sample Output:

Factorials of 5 : [1, 1, 2, 6, 24, 120]
Factorials of 9 : [1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880]

Python Code Editor:


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Previous: Write a Python program which iterates the integers from 1 to a given number and print "Fizz" for multiples of three, print "Buzz" for multiples of five, print "FizzBuzz" for multiples of both three and five using itertools module.
Next: Write a Python program to find the years where 25th of December be a Sunday between 2000 and 2150.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m