TypeError: tuple indices must be integers or slices, not str
<p>I need to make a function that updates tuples in a list of tuples. The tuples contain transactions, which are characterised by ammount, day, and type. I made this function that should completely replace a tuple with a new one, but  when I try to print the updated list of tuples I get the error:</p>

<pre><code>TypeError: tuple indices must be integers or slices, not str
</code></pre>

<p>The code:</p>

<pre><code>def addtransaction(transactions, ammount, day, type): 
    newtransactions = {
        "Ammount": ammount,
        "Day": day,
        "Type": type
        }
   transactions.append(newtransaction)

def show_addtransaction(transactions):
     Ammount = float(input("Ammount: "))
     Day = input("Day: ")
     Type = input("Type: ")
    addtransaction(transactions, ammount, day, type)

def show_all_transaction(transactions):
    print()
    for i, transaction in enumerate(transactions):
        print("{0}. Transaction with the ammount of {1} on day {2} of type:     {3}".format(
            i + 1,
            transaction['Ammount'], ; Here is where the error occurs.
            transaction['Day'],
            transaction['Type']))

def update_transaction(transactions): ; "transactions" is the list of tuples
    x = input("Pick a transaction by index:") 
    a = float(input("Choose a new ammount:"))
    b = input("Choose a new day:")
    c = input("Choose a new type:")
    i = x
    transactions[int(i)] = (a, b, c)

addtransaction(transactions, 1, 2, service)
show_all_transaction(transactions)
update_transaction(transactions)
show_all_transaction(transactions)
</code></pre>