Suppose we have a string s, an index i and a character c. We have to replace the ith character of s using c. Now in Python, strings are immutable in nature. We cannot write a statement like s[i] = c, it will raise an error [TypeError: 'str' object does not support item assignment]
So, if the input is like s = "python", i = 3, c = 'P', then the output will be "pytPon"
To solve this, we will follow these steps −
left := s[from index 0 to i]
right := s[from index i+1 to end]
return left concatenate c concatenate right
Let us see the following implementation to get better understanding
def solve(s, i, c): left = s[:i] right = s[i+1:] return left + c + right s = "python" i = 3 c = 'P' print(solve(s, i, c))
python, 3, 'P'