Learn Lambda Functions by Building an Expense Tracker - Step 36

Tell us what’s happening:

I know what the answer is but I’m getting stuck on why the ’ is used before the "" in this case. Also, why is there a space between the : and ’ in this problem?

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"]}')
    
def total_expenses(expenses):
    return sum(map(lambda expense: expense['amount'], expenses))
    
def filter_expenses_by_category(expenses, category):
    return filter(lambda expense: expense['category'] == category, expenses)
    

def main():
    expenses = []
    while True:
        print('\nExpense Tracker')
        print('1. Add an expense')
        print('2. List all expenses')
        print('3. Show total expenses')
        print('4. Filter expenses by category')
        print('5. Exit')
       
        choice = input('Enter your choice: ')

        if choice == '1':
            amount = float(input('Enter amount: '))
            category = input('Enter category: ')
            add_expense(expenses, amount, category)

# User Editable Region

        elif choice == '2':
            print('\nAll Expenses:')
            print_expenses(expenses)
        elif choice == '3':
            print(f'\nTotal Expenses: ', total_expenses(expenses))

# User Editable Region

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Challenge Information:

Learn Lambda Functions by Building an Expense Tracker - Step 36

I think the second part of your question refers to the space here? It’s just what the instructions ask for. You can have spaces in a string, and this will just make for better output.

I’m not sure what the first part of your question is about, can you give an example?