Python Challenges: Add the digits of a positive integer repeatedly until the result has a single digit
Python Challenges - 1: Exercise-16 with Solution
Write a Python program to add the digits of a positive integer repeatedly until the result has a single digit.
Explanation :
Sample Solution:-
Python Code:
def add_digits(num):
return (num - 1) % 9 + 1 if num > 0 else 0
print(add_digits(48))
print(add_digits(59))
Sample Output:
3 5
Flowchart:
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Previous: Write a Python program to find two elements once in a list where every element appears exactly twice in the list.
Next: Write a Python program to find whether it contains an additive sequence or not.
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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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