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 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
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