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Mutations.py
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Mutations.py
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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, .
# The next line contains an integer , denoting the index location and a character separated by a space.
#
# Output Format
# Using any of the methods explained above, replace the character at index with character .
#
# Sample Input
# abracadabra
# 5 k
# Sample Output
# abrackdabra
# Note - Strings r immutable in Python
def mutate_string(string, position, character):
return string[:position] + character + string[(position + 1):]
if __name__ == '__main__':
s = input()
i, c = input().split()
s_new = mutate_string(s, int(i), c)
print(s_new)