Removing existing tuples from a list of tuple

[Bruizeh]

For one of my rev questions I am trying to write a function that updates a list of tuples whenever a user decides to add a new contact. This has to be done by removing a tuple if the new contact name already exists in the list and appending the new contact info into the list.

code so far

 def update_contact(list_of_tuples, search_name, new_phone):
        
        if search_name in list(sum(list_of_tuples, ())):
            x = list_of_tuples.index(search_name)
            list_of_tuples.remove(x)
            
            new_entry = (search_name, new_phone)
            list_of_tuples.append(new_entry)
            print(search_name + "'s phone number has been updated.")
        else:
            print(search_name, "is NOT found.")

Expected output:

data = [('Jill', '5239980'), ('Bob', '4562345'), ('Jenny', '2541273')]
    update_contact(data, 'Bob', '1111111')
    update_contact(data, 'Daniel', '2222222')
    
    Bob's phone number has been updated.
    Daniel is NOT found.
    Jill's phone number is 5239980
    Jenny's phone number is 2541273
    Bob's phone number is 1111111
    There are 3 contacts in the list.

Error:

x = list_of_tuples.index(search_name)
    ValueError: 'Bob' is not in list

I'm confused because Bob is in the list?