class ExpenseTracker:
#Constructor: no parameters.
def __init__(self):
self.expenses = {}
#adds an expense under a specific category. Returns True.
def add_expense(self, category, amount):
if category in self.expenses:
self.expenses[category] += amount
else:
self.expenses[category] = amount
return True
#returns the total amount of all expenses.
def get_total_expenses(self):
return sum(self.expenses.values())
#returns the total expenses for a specific category. Returns 0 if the category does not exist.
def get_expenses_by_category(self, category):
return self.expenses.get(category, 0)
#returns a dictionary of all categories and their respective total expenses.
def get_all_expenses(self):
return self.expenses
