String — Not able to modify string

I have the following code:

welcome = 'Welcome to my house'
welcome[2] = 'd'

But it always gives an error.
Can anyone guide me to solve the mistake?
I am very new to programming, and I am sorry if my question is silly.

>Solution :

String data type is immutable. Therefore, you cannot explicitly modify a string.
You can split all the characters to form a list, change the character, then form the string again.

def spliter(string):
    return [char for char in string]
s = "Welcome to my house"
l = spliter(s)
l[2] = 'd'
welcome = ''
for i in l:
    welcome += i

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