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Python: Product of the odd digits in n, or 0 if there aren't any

Python Programming Puzzles: Exercise-35 with Solution

Write a Python program to compute the product of the odd digits in a given number, or 0 if there aren't any.

Input:  
123456789
Output:
945

Input:  
2468
Output:
0

Input:  
13579
Output:
945

Pictorial Presentation:

Python: Product of the odd digits in n, or 0 if there aren't any.
Python: Product of the odd digits in n, or 0 if there aren't any.
Python: Product of the odd digits in n, or 0 if there aren't any.

Sample Solution:

Python Code:

#License: https://bit.ly/3oLErEI

def test(n):
    if any(int(c) % 2 for c in str(n)):
        prod = 1
        for c in str(n):
            if int(c) % 2 == 1:
                prod *= int(c)
        return prod
    return 0

n = 123456789
print("Original Number:",n)
print("Product of the odd digits in the said number, or 0 if there aren't any")
print(test(n))
n = 2468
print("\nOriginal Number:",n)
print("Product of the odd digits in the said number, or 0 if there aren't any")
print(test(n))
n = 13579
print("\nOriginal Number:",n)
print("Product of the odd digits in the said number, or 0 if there aren't any")
print(test(n))

Sample Output:

Original Number: 123456789
Product of the odd digits in the said number, or 0 if there aren't any
945

Original Number: 2468
Product of the odd digits in the said number, or 0 if there aren't any
0

Original Number: 13579
Product of the odd digits in the said number, or 0 if there aren't any
945

Flowchart:

Flowchart: Python - Product of the odd digits in n, or 0 if there aren't any.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor :

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Previous: Find the sum of the numbers among the first k with more than 2 digits.
Next: Find the largest k 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