Doubt in a quiz

in the question:

string=’I study Python’
string[2]=’Z’
string[7]=’-’

why will it show an error?
shouldn’t the answer be ‘I Ztudy-Python’ ?

String are immutable in python ,i.e., we cant alter it once we have created it. Hence it is wrong

I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.

On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.