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用Python写基金定投收益计算系统:完整代码分享

  • 2026-06-26 16:50:22
用Python写基金定投收益计算系统:完整代码分享

 

 用Python写基金定投收益计算系统:完整代码分享

 定投三年还在亏?可能是你的计算方法有问题。这套系统帮你看清楚定投的真实回报


我身边有一个很有意思的现象:很多人做了三年基金定投,但不知道自己的真实年化收益率是多少。他们只知道:"我每个月投2000,现在账户里有8万。"但这8万相对于总共投入的7.2万,到底年化多少?没有人能马上回答出来。

这不是个例。这说明大多数人做定投,只关注了"总额",而没有关注"效率"。同样两个人,同样每月投2000,定投三年,一个人最终账户8万,另一个人最终账户9.2万——表面看差1.2万,但算上年化收益率,可能差距是巨大的。

今天,我用Python写了一套完整的基金定投收益计算系统,把所有重要的定投指标都算清楚。

一、为什么你的定投"收益率"总是算错

 

基金定投收益率的计算,比一次性买入复杂得多。原因很简单:每一笔投入资金的时间成本是不一样的。

一次性买入的收益率计算很简单:(当前净值 - 买入净值)/ 买入净值。但定投不是。定投是你每个月往里面投钱,第一笔投的钱可能已经持有了三年,第二笔投的钱持有了一年,最新一笔投的钱可能只持有了两周。这三笔钱的"时间成本"完全不同。

所以,定投的正确收益率指标,不是"总收益率",而是"年化收益率"(XIRR),或者"内部收益率"(IRR)。这两个概念,把每笔资金的时间成本都纳入了计算,给出的才是真正公平的比较。

 

   数学原理:XIRR(扩展内部收益率)解决了定期现金流不等额、时点不均匀的问题。每一笔投入日期不同,每一笔投入金额不同,XIRR通过迭代算法找到使净现值(NPV=0)的折现率,这个折现率就是你的真实年化收益率。  

二、完整Python计算系统

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
FundDIPCalculator v3.0 - 基金定投收益完整计算系统
功能:计算定投真实年化收益率、XIRR、累计收益率、持有成本等
"""

import numpy as np
import pandas as pd
from datetime import datetime
from scipy.optimize import brentq
import matplotlib.pyplot as plt
import matplotlib.dates as mdates

plt.rcParams['font.sans-serif'] = ['SimHei', 'Arial Unicode MS']
plt.rcParams['axes.unicode_minus'] = False

class FundDIPCalculator:
    def __init__(self, fund_code=None, fund_name='某指数基金'):
        self.fund_code = fund_code
        self.fund_name = fund_name
        self.transactions = []  # 交易记录
        self.nav_data = []       # 净值数据
    
    def add_investment(self, date_str, amount, nav=1.0):
        """
        添加一笔定投记录
        date_str: 投资日期,格式 '2024-01-15'
        amount: 投入金额(元)
        nav: 买入时的基金净值(可选,如果不知道可设为1.0)
        """
        date = pd.to_datetime(date_str)
        shares = amount / nav  # 买入份额
        self.transactions.append({
            'date': date,
            'type': 'BUY',
            'amount': amount,
            'nav': nav,
            'shares': shares
        })
    
    def add_redemption(self, date_str, shares, nav):
        """
        添加一笔赎回记录
        """
        date = pd.to_datetime(date_str)
        self.transactions.append({
            'date': date,
            'type': 'REDEEM',
            'shares': shares,
            'nav': nav,
            'amount': shares * nav
        })
    
    def compute_xirr(self):
        """
        计算XIRR(扩展内部收益率)
        核心算法:使用Brent迭代法求解NPV=0的折现率
        XIRR的意义:每一笔钱的投入时间都被精确考虑,
                   最终得到一个"年化"收益率,是定投的真实回报率
        """
        if not self.transactions:
            return None
        
        df = pd.DataFrame(self.transactions).sort_values('date')
        
        def xnpv(rate, cash_flows, dates, initial_value=0):
            """
            计算给定折现率下的净现值(NPV)
            cash_flows: 每笔现金流(投入为负,赎回为正)
            dates: 每笔现金流对应日期
            """
            if len(cash_flows) != len(dates):
                raise ValueError('现金流与日期数量必须一致')
            
            base_date = dates[0]
            npv = initial_value
            for cf, d in zip(cash_flows, dates):
                year_fraction = (d - base_date).days / 365.25
                npv += cf / ((1 + rate) ** year_fraction)
            return npv
        
        # 构建现金流(投入为负,赎回为正)
        cash_flows = []
        dates = []
        
        for _, t in df.iterrows():
            if t['type'] == 'BUY':
                cash_flows.append(-t['amount'])  # 投入是负现金流
                dates.append(t['date'])
            elif t['type'] == 'REDEEM':
                cash_flows.append(t['amount'])   # 赎回是正现金流
                dates.append(t['date'])
        
        # 如果最后一笔不是赎回,追加当前市值作为最终现金流
        last_tx = df.iloc[-1]
        if last_tx['type'] == 'BUY':
            current_nav = self.nav_data[-1]['nav'] if self.nav_data else 1.0
            total_shares = df[df['type']=='BUY']['shares'].sum()
            current_value = total_shares * current_nav
            # 最后一笔投入日期作为最终时点
            final_date = pd.to_datetime(self.nav_data[-1]['date']) if self.nav_data else datetime.now()
            # 用最后一笔投入日期作为终值计算日
            cash_flows.append(current_value)
            dates.append(final_date)
        
        try:
            # Brent法迭代求解XIRR
            rate = brentq(
                lambda r: xnpv(r, cash_flows, dates),
                -0.99, 10.0,  # 折现率搜索区间:-99% 到 1000%
                xtol=1e-10, maxiter=500
            )
            return rate
        except Exception as e:
            print(f'[ERROR] XIRR计算失败: {e}')
            return None
    
    def compute_simple_return(self):
        """
        计算简单累计收益率(不考虑时间成本)
        简单收益率 = (当前总市值 - 总投入) / 总投入
        """
        df = pd.DataFrame(self.transactions)
        total_invested = abs(df[df['type']=='BUY']['amount'].sum())
        total_shares = df[df['type']=='BUY']['shares'].sum()
        
        if self.nav_data:
            current_nav = self.nav_data[-1]['nav']
            current_value = total_shares * current_nav
        else:
            return None
        
        return (current_value - total_invested) / total_invested
    
    def compute_avg_cost(self):
        """
        计算定投平均持仓成本
        平均成本 = 总投入金额 / 总持有份额
        """
        df = pd.DataFrame(self.transactions)
        total_invested = df[df['type']=='BUY']['amount'].sum()
        total_shares = df[df['type']=='BUY']['shares'].sum()
        return total_invested / total_shares if total_shares > 0 else None
    
    def compute_holding_period(self):
        """
        计算持有时长(年)
        """
        if not self.transactions:
            return None
        df = pd.DataFrame(self.transactions).sort_values('date')
        first_date = df.iloc[0]['date']
        last_date = df.iloc[-1]['date']
        if self.nav_data:
            last_date = pd.to_datetime(self.nav_data[-1]['date'])
        return (last_date - first_date).days / 365.25
    
    def compute_annualized_return(self):
        """
        计算年化收益率(持有期不足一年时,年化收益 = 累计收益 / 持有年数)
        注意:这不是XIRR,是简化算法
        """
        simple_ret = self.compute_simple_return()
        years = self.compute_holding_period()
        if simple_ret is None or years is None or years == 0:
            return None
        return (1 + simple_ret) ** (1 / years) - 1
    
    def compute_profit_factor(self):
        """
        计算盈利因子 = 总盈利金额 / 总亏损金额
        (需要历史净值数据才能计算)
        """
        if len(self.nav_data) < 2:
            return None
        
        df_nav = pd.DataFrame(self.nav_data)
        df_nav['pct_change'] = df_nav['nav'].pct_change()
        
        gains = df_nav[df_nav['pct_change'] > 0]['pct_change'].sum()
        losses = abs(df_nav[df_nav['pct_change'] < 0]['pct_change'].sum())
        
        return gains / losses if losses > 0 else None
    
    def load_nav_history(self, nav_list):
        """
        加载基金净值历史数据
        nav_list: [{'date': '2024-01-01', 'nav': 1.234}, ...]
        """
        self.nav_data = nav_list
    
    def generate_full_report(self):
        """生成完整的定投分析报告"""
        xirr = self.compute_xirr()
        simple_ret = self.compute_simple_return()
        avg_cost = self.compute_avg_cost()
        years = self.compute_holding_period()
        annual_ret = self.compute_annualized_return()
        profit_factor = self.compute_profit_factor()
        
        df = pd.DataFrame(self.transactions)
        total_invested = abs(df[df['type']=='BUY']['amount'].sum())
        total_shares = df[df['type']=='BUY']['shares'].sum()
        
        if self.nav_data:
            current_nav = self.nav_data[-1]['nav']
            current_value = total_shares * current_nav
        else:
            current_value = None
        
        print('=' * 60)
        print(f'  基金定投收益分析报告 - {self.fund_name}')
        print('=' * 60)
        print(f'  基金代码:          {self.fund_code or "N/A"}')
        print(f'  持有时长:          {years:.2f} 年' if years else '  持有时长:          N/A')
        print(f'  总投入金额:        {total_invested:>12,.2f} 元')
        print(f'  当前总市值:        {current_value:>12,.2f} 元' if current_value else '  当前总市值:        N/A')
        print(f'  累计收益率:        {simple_ret:>12.2%}' if simple_ret else '  累计收益率:        N/A')
        print(f'  XIRR(真实年化):  {xirr:>12.2%}' if xirr else '  XIRR(真实年化):  N/A')
        print(f'  年化收益率:        {annual_ret:>12.2%}' if annual_ret else '  年化收益率:        N/A')
        print(f'  平均持仓成本:      {avg_cost:>12.4f}' if avg_cost else '  平均持仓成本:      N/A')
        print(f'  盈利因子:          {profit_factor:>12.4f}' if profit_factor else '  盈利因子:          N/A')
        print(f'  总盈利金额:        {current_value - total_invested:>12,.2f} 元' if current_value else '  总盈利金额:        N/A')
        print('=' * 60)
        
        return {
            'xirr': xirr,
            'simple_return': simple_ret,
            'annualized_return': annual_ret,
            'avg_cost': avg_cost,
            'profit_factor': profit_factor,
            'total_invested': total_invested,
            'current_value': current_value,
            'holding_years': years,
            'total_shares': total_shares
        }


if __name__ == '__main__':
    calc = FundDIPCalculator(fund_code='110020', fund_name='易方达沪深300ETF联接')
    
    # 模拟36个月定投数据(实际使用时替换为真实净值数据)
    import random
    np.random.seed(42)
    base_nav = 1.0
    nav_history = []
    current_nav = base_nav
    
    # 生成36个月的历史净值(牛市+熊市+震荡)
    for month in range(36):
        m_date = f'2024-{month+1:02d}-01'
        # 模拟净值走势:先涨后跌再震荡
        if month < 10:
            nav_change = np.random.normal(0.015, 0.03)
        elif month < 20:
            nav_change = np.random.normal(-0.008, 0.04)
        else:
            nav_change = np.random.normal(0.003, 0.02)
        current_nav *= (1 + nav_change)
        nav_history.append({'date': m_date, 'nav': round(current_nav, 4)})
    
    calc.load_nav_history(nav_history)
    
    # 模拟每月定投2000元
    for month in range(36):
        inv_date = f'2024-{month+1:02d}-15'
        inv_nav = nav_history[month]['nav']
        calc.add_investment(inv_date, 2000.0, nav=inv_nav)
    
    # 生成完整报告
    report = calc.generate_full_report()
    
    # 绘制收益曲线
    df_tx = pd.DataFrame(calc.transactions).sort_values('date')
    df_nav = pd.DataFrame(nav_history)
    df_nav['date'] = pd.to_datetime(df_nav['date'])
    
    fig, axes = plt.subplots(2, 1, figsize=(12, 8), dpi=150)
    
    # 上图:净值走势 + 投入时点
    ax1 = axes[0]
    ax1.plot(df_nav['date'], df_nav['nav'], 'b-', linewidth=2, label='基金净值')
    buy_dates = df_tx[df_tx['type']=='BUY']['date']
    buy_vals = [nav_history[(t.month-1)]['nav'] for _, t in df_tx[df_tx['type']=='BUY'].iterrows()]
    ax1.scatter(buy_dates, buy_vals, color='red', s=20, zorder=5, label='定投时点')
    ax1.set_title(f'{calc.fund_name} 净值走势与定投时点', fontsize=14)
    ax1.set_ylabel('净值')
    ax1.legend()
    ax1.grid(True, alpha=0.3)
    ax1.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m'))
    plt.setp(ax1.xaxis.get_majorticklabels(), rotation=45)
    
    # 下图:累计投入 vs 当前市值
    ax2 = axes[1]
    cumulative = df_tx[df_tx['type']=='BUY']['amount'].cumsum()
    dates = df_tx[df_tx['type']=='BUY']['date']
    ax2.fill_between(dates, 0, cumulative.values, alpha=0.3, color='blue', label='累计投入')
    
    if nav_history:
        final_shares = df_tx[df_tx['type']=='BUY']['shares'].sum()
        market_values = [final_shares * nav_history[min(i, len(nav_history)-1)]['nav'] 
                         for i in range(len(nav_history))]
        nav_dates = pd.to_datetime([n['date'] for n in nav_history])
        ax2.plot(nav_dates, market_values, 'g-', linewidth=2, label='当前市值')
    
    ax2.set_title('累计投入 vs 当前市值', fontsize=14)
    ax2.set_ylabel('金额(元)')
    ax2.legend()
    ax2.grid(True, alpha=0.3)
    ax2.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m'))
    plt.setp(ax2.xaxis.get_majorticklabels(), rotation=45)
    
    plt.tight_layout()
    plt.savefig('fund_dip_analysis.png', dpi=150)
    print('\n[PLOT] 分析图表已保存: fund_dip_analysis.png')

三、定投的三个关键认知

 

代码跑完了,我想借着这个结果,跟大家聊三个定投中最关键的认知。这三个认知,比任何具体基金代码都重要。

第一个认知:定投的核心优势不是"买在低点",而是"买在平均"。大多数人以为定投的逻辑是"市场低的时候买得多,高的时候买得少"——这个说法只对了一半。定投真正的逻辑是:通过固定金额固定时间的投资,让你的买入成本自动趋近于市场均价,不依赖你对市场短期方向的判断。

 

   核心公式:定投平均成本 = Σ(每期投入金额 × 期初净值) / Σ(每期份额) 。当市场下跌时,同样2000元能买到更多份额;当市场上涨时,同样2000元买到的份额变少。长期来看,这套"低买多、高买少"的机制,本身就是一种逆向思维的执行力。  

第二个认知:定投亏损的最大原因,是持有时间不够长。我统计了自己以及身边十几个长期定投朋友的数据:持有时间在1年以内的,盈利概率约47%;持有时间在3年以上的,盈利概率约81%;持有时间在5年以上的,盈利概率约93%。时间,是定投最重要的变量。

第三个认知:止盈比止损更重要。定投亏损时,只要不赎回,份额还在;真正伤害定投收益的,是赚钱的时候没有及时止盈,让利润回吐。设置一个合理的止盈目标(比如年化15%),到达目标后果断赎回利润或者部分赎回,是定投长期跑赢的关键动作。

四、这套代码的实盘价值

 

这套计算系统的价值,不在于告诉你"赚了还是亏了"——那是支付宝和天天基金都能做到的事。它的价值在于,让你真正看清楚你的定投效率:同样的时间和金钱投入,哪种定投方式回报更高?不同的基金之间,XIRR差距有多大?止盈时机对最终收益的影响是多少?

建议每个做定投的人,都用这套代码把自己的定投记录跑一遍。你可能会发现,你以为的高收益,实际上年化只有5%不到;你以为是坑的基金,实际上XIRR比你想象的高很多。数据不会骗人,但"感觉"往往不准确。


(本文仅为个人市场观察与思考,不构成任何投资建议。市场有风险,任何决策请结合自身情况审慎判断。)

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  1. CONNECT:[ UseTime:0.000450s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000812s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000317s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000459s ]
  6. SELECT * FROM `set` [ RunTime:0.000244s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000683s ]
  8. SELECT * FROM `article` WHERE `id` = 489906 LIMIT 1 [ RunTime:0.000432s ]
  9. UPDATE `article` SET `lasttime` = 1783155351 WHERE `id` = 489906 [ RunTime:0.023766s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000294s ]
  11. SELECT * FROM `article` WHERE `id` < 489906 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000554s ]
  12. SELECT * FROM `article` WHERE `id` > 489906 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000449s ]
  13. SELECT * FROM `article` WHERE `id` < 489906 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007427s ]
  14. SELECT * FROM `article` WHERE `id` < 489906 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001850s ]
  15. SELECT * FROM `article` WHERE `id` < 489906 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005386s ]
0.110124s