Method add_expense

Expense_Tracker/expense_tracker.py:6–9

(self, date, amount, category)

        self.categories = {}

    def add_expense(self, date, amount, category):
        if category not in self.expenses:
            self.expenses[category] = []
        self.expenses[category].append((date, amount))

    def add_category(self, category):
        if category not in self.categories: