# Python Data Structures and Algorithms: Recursion - Exercises, Practice, Solution

## Data Structures and Algorithms: 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 :

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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 :

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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 Code Editor:**

**More to Come !**

**Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.**

## Python: Tips of the Day

**Python: How do I copy a file in Python?**

shutil has many methods you can use. One of which is:

from shutil import copyfile copyfile(src, dst)

- Copy the contents of the file named src to a file named dst.
- The destination location must be writable; otherwise, an IOError exception will be raised.
- If dst already exists, it will be replaced.
- Special files such as character or block devices and pipes cannot be copied with this function.
- With copy, src and dst are path names given as strings.

If you use os.path operations, use copy rather than copyfile. copyfile will only accept strings.

Ref: https://bit.ly/3e2Y1G0

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