Mutations in Python - HackerRank Solution
Problem :
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 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
Solution 1 :
1 2 3 4 5 6 7 8 9 10 11 12 13 | # Mutations in Python - HackerRank Solution 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) |
Solution 2 :
1 2 3 4 5 6 7 8 9 10 11 12 13 | # Mutations in Python - HackerRank Solution def mutate_string(string, position, character): # Mutations in Python - HackerRank Solution START pos = position+1 Output = string[:position]+character+string[pos:] return Output # 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) |
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Hey, I am Parthe Omkar
def mulatble(string, position, character):
l = list(string)
l[position] = character;
string = ''.join(l);
return string
if __name__=='__main__':
string = input()
position, character = input().split()
new = mulatble(string, int(position), character)
print(new)
In the second solution the output should be
Output = string[:position-1]+character+[position:]