Mutations in Python HackerRank Solution

Hello Programmers, In this post, you will know how to solve the Mutations in Python HackerRank Solution. This problem is a part of the HackerRank Python Programming Series.

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One more thing to add, don’t directly look for the solutions, first try to solve the problems of Hackerrank by yourself. If you find any difficulty after trying several times, then you can look for solutions.

Mutations in Python HackerRank Solution

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We have seen that lists are mutable (they can be changed), and tuples are immutable (they cannot be changed).
Let’s try to understand this with an example.
You are given an immutable string, and you want to make changes to it.

Example :

>>> string = "abracadabra"

You can access an index by:

>>> print string[5]
a

What if you would like to assign a value?

>>> string[5] = 'k'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'str' object does not support item assignment

How would you approach this?One solution is to convert the string to a list and then change the value.Example :

>>> string = "abracadabra"
>>> l = list(string)
>>> l[5] = 'k'
>>> string = ''.join(l)
>>> print string
abrackdabra

Another approach is to slice the string and join it back.Example :

>>> string = string[:5] + "k" + string[6:]
>>> print string
abrackdabra

Task :

Read a given string, change the character at a given index and then print the modified string.

Input Format :

The first line contains a string, S.
The next line contains an integer i, denoting the index location and a character c separated by a space.

Output Format :

Using any of the methods explained above, replace the character at index i with character c.

Sample Input :

abracadabra
5 k

Sample Output :

abrackdabra

Mutations in Python HackerRank Solutions

def mutate_string(string, position, character):
    # Mutations in Python - HackerRank Solution START
    l = list(string)
    l[position] = character;
    string = ''.join(l);
    return string
    # Mutations in Python - HackerRank Solution END
if __name__ == '__main__':
    s = input()
    i, c = input().split()
    s_new = mutate_string(s, int(i), c)
    print(s_new)

Disclaimer: The above Problem (Mutations in Python) is generated by Hackerrank but the Solution is Provided by BrokenProgrammers. This tutorial is only for Educational and Learning purposes.

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