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

### Tell us what’s happening:

Describe your issue in detail here.

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/120.0.0.0 Safari/537.36 Edg/120.0.0.0

### Challenge Information:

Learn Lambda Functions by Building an Expense Tracker - Step 18
https://www.freecodecamp.org/learn/scientific-computing-with-python/learn-lambda-functions-by-building-an-expense-tracker/step-18`Preformatted text`

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

You should return sum(map(lambda expense: expense['amount'], expenses)) from your total_expenses function.