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Python Challenges: Find the largest prime factor of a given number

Python Challenges - 1: Exercise-35 with Solution

Write a Python program to find the largest prime factor of a given number.

The prime factors of 330 are 2, 3, 5 and 11. Therefore 11 is the largest prime factor of 330.
Sample Example: 330 = 2 × 3 × 5 × 11

Sample Solution:-

Python Code:

def Largest_Prime_Factor(n):
    return next(n // i for i in range(1, n) if n % i == 0 and is_prime(n // i))
def is_prime(m):
    return all(m % i for i in range(2, m - 1))
print(Largest_Prime_Factor(200))
print(Largest_Prime_Factor(330))
print(Largest_Prime_Factor(243423423330))

Sample Output:

5
11
1114117

Flowchart:

Python Flowchart: Find the largest prime factor of a given number

Python Code Editor:

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Previous: Write a Python program to compute the sum of the even-valued terms in the Fibonacci sequence whose values do not exceed one million.
Next: Write a Python program to find the largest palindrome made from the product of two 4-digit numbers

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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