# Learn Lambda Functions by Building an Expense Tracker - Step 18

Python It asks me to sum the map thats what i did and the advice gave me th eanswer clearly i applied it but it still doesnt work. can i have some help pls?

``````def add_expense(expenses, amount, category):
expenses.append({'amount': amount, 'category': category})

def print_expenses(expenses):
for expense in expenses:
print(f'Amount: {expense["amount"]}, Category: {expense["category"]}')

/* User Editable Region */

def total_expenses(expenses):
sum(map(lambda expense: expense['amount'], expenses))

/* User Editable Region */

expenses = []
``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36 OPR/105.0.0.0`

### Challenge Information:

Learn Lambda Functions by Building an Expense Tracker - Step 18

Hello

You almost have it. You just need to return the result (hint: same line).

``````return sum(map(lambda expense: expense['amount'], expenses))
``````

# still not working

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Thank you.

That should work. Check the formatting (indentation)?

It’ll definitely work if you fix the indentation.