Learn Lambda Functions by Building an Expense Tracker - Step 19

Python
1

Tell us what’s happening:

I seriously don’t know what I am doing wrong here, could someone please help, tryed googling how to use return but im not finding a solution, i’ve been stuck for a good hour.

Your code so far

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)) 
   return total_expenses 

# User Editable Region


expenses = []

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 Edg/125.0.0.0

Challenge Information:

Learn Lambda Functions by Building an Expense Tracker - Step 19

2

Hi there and welcome to our community!

You can’t return a variable which doesn’t exist (total_expenses).
That said, you don’t actually need to create another variable. Instead you can just prefix the existing line of code above it with the return keyword.

2 Likes
3

thanks! I was using print instead of return

1 Like