Python: Find the index of the largest prime in the list and the sum of its digits
Python Programming Puzzles: Exercise-76 with Solution
Write a Python program to find the index of the largest prime in the list and the sum of its digits.
Input: [3, 7, 4] Output: [1, 7] Input: [3, 11, 7, 17, 19, 4] Output: [4, 10] Input: [23, 17, 201, 14, 10473, 43225, 421, 423, 11, 10, 2022, 342157] Output: [6, 7]
Pictorial Presentation:
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
n, i = max((n, i) for i, n in enumerate(nums) if is_prime(n))
return [i, sum(int(c) for c in str(n))]
def is_prime(n):
return n > 1 and all(n % j for j in range(2, int(n ** 0.5) + 1))
nums = [3, 7, 4]
print("List of numbers:",nums)
print("Index of the largest prime in the said list and the sum of its digits:")
print(test(nums))
nums = [3, 11, 7, 17, 19, 4]
print("\nList of numbers:",nums)
print("Index of the largest prime in the said list and the sum of its digits:")
print(test(nums))
nums = [23, 17, 201, 14, 10473, 43225, 421, 423, 11, 10, 2022, 342157]
print("\nList of numbers:",nums)
print("Index of the largest prime in the said list and the sum of its digits:")
print(test(nums))
Sample Output:
List of numbers: [3, 7, 4] Index of the largest prime in the said list and the sum of its digits: [1, 7] List of numbers: [3, 11, 7, 17, 19, 4] Index of the largest prime in the said list and the sum of its digits: [4, 10] List of numbers: [23, 17, 201, 14, 10473, 43225, 421, 423, 11, 10, 2022, 342157] Index of the largest prime in the said list and the sum of its digits: [6, 7]
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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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