# Learn Lambda Functions by Building an Expense Tracker - Step 17

### Tell us what’s happening:

I will need help to solve step 17. I have try interpreting the instruction and have the following :
return (lambda expense: expense[‘amount’], expenses)

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

# User Editable Region

expenses = []
``````

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### Challenge Information:

Learn Lambda Functions by Building an Expense Tracker - Step 17

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

You need only the lambda function to pass this step. Remove the unnecessary parts and you’ll be able to pass.

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I have the same problem and have no clue how to solve it. Read the documentation on lambda function, looked through a lot of examples. My code won’t pass.
Here it is:

``````def total_expenses(expenses):
return lambda expense : expense['amount']
``````

Found solution online. It was not easy )
For future students who will get stuck on this step , I can recommend this useful article:

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