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Python Math: Get the sum of the powers of all the numbers from start to end (both inclusive)

Python Math: Exercise-85 with Solution

Write a Python program to get the sum of the powers of all the numbers from start to end (both inclusive).

  • Use range() in combination with a list comprehension to create a list of elements in the desired range raised to the given power.
  • Use sum() to add the values together.
  • Omit the second argument, power, to use a default power of 2.
  • Omit the third argument, start, to use a default starting value of 1.

Sample Solution:

Python Code:

def sum_of_powers(end, power = 2, start = 1):
  return sum([(i) ** power for i in range(start, end + 1)])

print(sum_of_powers(12))
print(sum_of_powers(12, 3))
print(sum_of_powers(12, 5, 7))

Sample Output:

650
6084
618507

Flowchart:

Flowchart: Get the sum of the powers of all the numbers from start to end (both inclusive).

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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