Learn Lambda Functions by Building an Expense Tracker - Step 25

Python
1

Tell us what’s happening:

what in the big blue sea am I missing to do in this step? because I have no idea what I’m missing

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):
    lambda arguments: expense
    return expense["amount"]

# 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/133.0.0.0 Safari/537.36

Challenge Information:

Learn Lambda Functions by Building an Expense Tracker - Step 25

2

Getting there. The instructions do not ask you to return anything.

return expense["amount"]

This is how you access the “amount” key in the expense dictionary, so that’s good :+1:

Example of lambda syntax: https://www.w3schools.com/python/python_lambda.asp

lambda arguments : expression

Arguments and parameters go together, right?

Replace pass with a lambda function that has expense as its parameter.

So that leaves the expression:

your lambda function should return the value of the 'amount' key in the expense dictionary.

I hope this helps

1 Like
3

I’m just going to say this but until today I have never really used lambda before

4

I think this will help thank you

5

Well you are following a tutorial called " Learn Lambda Functions" so that’s not really surprising.

If you ever don’t understand something you should do a search and read one or two other sources for an explanation and examples.

w3schools and geeksforgeeks work really well for me

https://www.geeksforgeeks.org/python-lambda/

6

so do I need to keep the return function?

7

Did you look at any examples from the links I’ve sent you?

Do any of those have return in the them?

8

I get that but even without the return I can’t move onto the next step

9

Please post your updated code.

10

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”]}')

def total_expenses(expenses):
lambda arguments: expense

expenses =

11

this is my current code and it doesn’t let me move on

12

I fixed it I needed to change arguments to expense

1 Like