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Python: Recursion - Exercises, Practice, Solution

Recursion [ 11 exercises with solution]

[An editor is available at the bottom of the page to write and execute the scripts.]

1. Write a Python program to calculate the sum of a list of numbers. Go to the editor
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2. Write a Python program to converting an Integer to a string in any base. Go to the editor
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3. Write a Python program of recursion list sum. Go to the editor
Test Data: [1, 2, [3,4], [5,6]]
Expected Result: 21
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4. Write a Python program to get the factorial of a non-negative integer. Go to the editor
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5. Write a Python program to solve the Fibonacci sequence using recursion. Go to the editor
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6. Write a Python program to get the sum of a non-negative integer. Go to the editor
Test Data:
sumDigits(345) -> 12
sumDigits(45) -> 9
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7. Write a Python program to calculate the sum of the positive integers of n+(n-2)+(n-4)... (until n-x =< 0). Go to the editor
Test Data:
sum_series(6) -> 12
sum_series(10) -> 30
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8. Write a Python program to calculate the harmonic sum of n-1. Go to the editor
Note: The harmonic sum is the sum of reciprocals of the positive integers.
Example :
harmonic series
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9. Write a Python program to calculate the geometric sum of n-1. Go to the editor
Note: In mathematics, a geometric series is a series with a constant ratio between successive terms.
Example :
harmonic series

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10. Write a Python program to calculate the value of 'a' to the power 'b'. Go to the editor
Test Data :
(power(3,4) -> 81
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11. Write a Python program to find  the greatest common divisor (gcd) of two integers. Go to the editor
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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