Python Challenges: Find the sum of the digits of a given number
Python Challenges - 1: Exercise-45 with Solution
Write a Python program to find the sum of the digits of a given number.
In mathematics, the factorial of a positive integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,
5!= 5 x 4 x 3 x 2 x 1 = 120
and the sum of the digits in the number 5! is 1 + 2 +0 = 3
Sample Solution:
Python Code:
import math
def compute(n):
n = math.factorial(n)
ans = sum(int(c) for c in str(n))
return str(ans)
print(compute(5))
print(compute(6))
Sample Output:
3 9
Flowchart:
Python Code Editor:
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Previous: Write a Python program to find the maximum total from top to bottom of the triangle below.
Next: Write a Python program to compute the sum of all the amicable numbers under a given number.
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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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