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Python Challenges: Compute s the sum of the digits of the number 220

Python Challenges - 1: Exercise-43 with Solution

Write a Python program to compute s the sum of the digits of the number 220.

210 = 1024 and the sum of its digits is 1 + 0 + 2 + 4 = 7

Sample Solution:

Python Code:

def digits_sum():
	n = 2**20
	ans = sum(int(c) for c in str(n))
	return str(ans)
print(digits_sum())

Sample Output:

31

Flowchart:

Python Flowchart: Compute s the sum of the digits of the number 2<sup>20</sup>.

Python Code Editor:

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Previous: Write a Python program to find the starting number, under ten thousand will create the longest chain.

Next: Write a Python program to find the maximum total from top to bottom of the triangle below.

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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