家庭财务管理系统毕设

家庭财务管理系统是一个非常适合毕设的主题，它可以帮助人们更好地管理家庭的财务情况。下面是一个简单的家庭财务管理系统的示例：

class Expense:
    def __init__(self, category, amount):
        self.category = category
        self.amount = amount

class Income:
    def __init__(self, source, amount):
        self.source = source
        self.amount = amount

class FamilyFinance:
    def __init__(self):
        self.expenses = []
        self.incomes = []

    def add_expense(self, category, amount):
        expense = Expense(category, amount)
        self.expenses.append(expense)

    def add_income(self, source, amount):
        income = Income(source, amount)
        self.incomes.append(income)

    def calculate_total_expenses(self):
        total_expenses = 0
        for expense in self.expenses:
            total_expenses += expense.amount
        return total_expenses

    def calculate_total_incomes(self):
        total_incomes = 0
        for income in self.incomes:
            total_incomes += income.amount
        return total_incomes

    def calculate_net_profit(self):
        total_incomes = self.calculate_total_incomes()
        total_expenses = self.calculate_total_expenses()
        net_profit = total_incomes - total_expenses
        return net_profit

# 示例用法
finance = FamilyFinance()
finance.add_expense("食品", 1000)
finance.add_expense("交通", 500)
finance.add_income("工资", 5000)
finance.add_income("股票收益", 2000)

total_expenses = finance.calculate_total_expenses()
total_incomes = finance.calculate_total_incomes()
net_profit = finance.calculate_net_profit()
print("总支出：", total_expenses)
print("总收入：", total_incomes)
print("净利润：", net_profit)

这个示例中，我们定义了三个类：`Expense`（支出）、`Income`（收入）和`FamilyFinance`（家庭财务）。`Expense`和`Income`类分别表示一笔支出和一笔收入，它们都有一个类别（category/source）和金额（amount）。`FamilyFinance`类用于管理家庭的财务情况，它可以添加支出和收入，并计算总支出、总收入和净利润。