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从0到1做一个“牛股识别系统”:Python量化分析实战

  • 2026-02-28 01:16:42
从0到1做一个“牛股识别系统”:Python量化分析实战

在投资世界里,有两个永恒的问题:

收益有多高? 风险有多大?

如果你能在“相对低风险”的情况下,找到“更高收益”的股票,那它大概率就是我们常说的——牛股区间

今天这篇文章,我带你用一段完整的 Python 代码,实现一个迷你版量化分析系统,包括:

  • ✅ 股票数据读取
  • ✅ 夏普比率计算
  • ✅ 风险-收益气泡图
  • ✅ 牛股区间圈选
  • ✅ 行业收益对比
  • ✅ Sharpe Top10筛选
  • ✅ 风险收益相关性分析
  • ✅ 牛股区间统计

一、数据读取:量化分析的第一步

stocks = pd.read_csv("stock_data.csv")
print("成功读取数据,数据条数:", len(stocks))

首先从 CSV 文件中读取股票数据。 数据字段包括:

字段
含义
industry
行业
volatility
年化波动率(风险)
return
年收益率
volume
成交额

然后做一个简单特征工程:

stocks["dot_size"] = stocks["volume"] * 4

成交额决定气泡大小,代表市场关注度。


二、核心指标:夏普比率(Sharpe Ratio)

量化投资里最经典的风险调整收益指标:

[ Sharpe = \frac{R - R_f}{\sigma} ]

代码实现:

risk_free_rate = 0.03
stocks["sharpe"] = (stocks["return"] - risk_free_rate) / stocks["volatility"]

含义:

  • 分子:超额收益
  • 分母:风险
  • 值越高 → 单位风险带来的收益越高

这一步非常关键,它决定了后续“优质股票”的筛选逻辑。


三、风险-收益气泡图:直观看市场结构

plt.scatter(...)

这张图展示的是经典的:

📍 横轴:波动率(风险) 📍 纵轴:收益率 📍 气泡大小:成交额 📍 颜色:行业

你会看到:

区域
含义
左上角
低风险高收益(理想区)
右上角
高风险高收益
左下角
低收益低风险
右下角
高风险低收益

四、自动圈选“牛股区间”

我们定义:

bull_zone = stocks[
    (stocks["return"] > 0.3) &
    (stocks["volatility"] < 0.3)
]

逻辑:

  • 收益率 > 30%
  • 波动率 < 30%

然后使用凸包算法(ConvexHull)进行自动圈选:

hull = ConvexHull(p)
poly = plt.Polygon(...)

这一步非常高级 —— 它不再是画矩形,而是自动围出真实的股票分布边界。

结果就是:

🔥 一张自动识别牛股区间的图

这在量化可视化中非常常见。


五、行业收益对比:行业轮动分析

industry_return = stocks.groupby("industry")["return"].mean()

通过分组统计平均收益,我们可以判断:

  • 哪个行业整体表现更强
  • 市场资金是否在轮动

这一步是宏观层面的判断。


六、Sharpe Top10:真正的“优质股”

top10 = stocks.sort_values("sharpe", ascending=False).head(10)

排序逻辑:

✔ 不是收益最高

✔ 而是“单位风险收益最高”

这是专业量化分析与散户思维最大的区别。


七、风险收益相关性分析

corr = stocks["volatility"].corr(stocks["return"])

并配合回归图:

sns.regplot(...)

你可以观察:

  • 风险是否真的带来更高收益?
  • 是否存在明显正相关?

如果相关性很低,说明市场并非简单“高风险=高收益”。


八、牛股区间统计分析

print("Number of Bull Stocks:", len(bull_zone))
print("Average Return:", ...)
print("Average Sharpe:", ...)

这一步属于策略评估:

  • 牛股数量是否合理?
  • 平均收益是否显著高于整体?
  • Sharpe 是否明显更优?

这就是量化策略验证的基本雏形。


九、完整分析流程总结

这套代码背后其实是一整套量化思路:

数据读取
   ↓
特征工程
   ↓
风险收益建模
   ↓
Sharpe计算
   ↓
可视化分析
   ↓
策略区间筛选
   ↓
统计验证

注:代码仅学习使用,禁止用于非法/不良用途


十、全部代码无偿分享

a、股票部分数据,自己可以多模拟点下面的数据,用来学习,以下只提供点样例stock_data.csv

b、创建一个.py的文件,将下面内容复制,运行

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import seaborn as sns
from scipy.spatial import ConvexHull
import warnings
warnings.simplefilter('ignore')

sns.set_style("whitegrid")




# =====================================
# 1. 读取CSV文件
# =====================================
stocks = pd.read_csv("stock_data.csv")
print("成功读取数据,数据条数:", len(stocks))

stocks["dot_size"] = stocks["volume"] * 4

# =====================================
# 2. 计算夏普比率
# =====================================
risk_free_rate = 0.03
stocks["sharpe"] = (stocks["return"] - risk_free_rate) / stocks["volatility"]

# =====================================
# 3. 风险收益气泡图
# =====================================
plt.figure(figsize=(148))
categories = stocks["industry"].unique()
colors = plt.cm.Set2(np.linspace(01, len(categories)))

for i, ind in enumerate(categories):
    plt.scatter(
        stocks.loc[stocks.industry == ind, "volatility"],
        stocks.loc[stocks.industry == ind, "return"],
        s=stocks.loc[stocks.industry == ind, "dot_size"],
        c=[colors[i]],
        label=ind,
        edgecolors="black",
        alpha=0.7
    )

# 牛股区间
bull_zone = stocks[
    (stocks["return"] > 0.3) &
    (stocks["volatility"] < 0.3)
]

defencircle(x, y, ax=None, **kw):
ifnot ax:
        ax = plt.gca()
    p = np.c_[x, y]
if len(p) > 2:
        hull = ConvexHull(p)
        poly = plt.Polygon(p[hull.vertices, :], **kw)
        ax.add_patch(poly)

encircle(
    bull_zone["volatility"],
    bull_zone["return"],
    ec="darkred",
    fc="gold",
    alpha=0.25
)

plt.xlabel("Annual Volatility (Risk)")
plt.ylabel("Annual Return")
plt.title("Risk-Return Bubble Plot with Bull Zone")
plt.legend()
plt.show()

# =====================================
# 4. 行业收益对比
# =====================================
industry_return = stocks.groupby("industry")["return"].mean().sort_values()

plt.figure(figsize=(85))
industry_return.plot(kind="bar")
plt.title("Average Return by Industry")
plt.ylabel("Average Return")
plt.show()

# =====================================
# 5. 夏普比率Top10
# =====================================
top10 = stocks.sort_values("sharpe", ascending=False).head(10)

print("\nTop 10 Stocks by Sharpe Ratio:")
print(top10[["industry""return""volatility""sharpe"]])

# =====================================
# 6. 风险收益相关性
# =====================================
corr = stocks["volatility"].corr(stocks["return"])
print(f"\nRisk-Return Correlation: {corr:.3f}")

plt.figure(figsize=(65))
sns.regplot(
    data=stocks,
    x="volatility",
    y="return",
    scatter_kws={"alpha"0.4}
)
plt.title("Risk vs Return Correlation")
plt.show()

# =====================================
# 7. 牛股区间统计
# =====================================
print("\nBull Zone Statistics:")
print("Number of Bull Stocks:", len(bull_zone))
print("Average Return in Bull Zone:", bull_zone["return"].mean())
print("Average Sharpe in Bull Zone:", bull_zone["sharpe"].mean())

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  1. CONNECT:[ UseTime:0.000612s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000882s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000304s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000512s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000623s ]
  8. SELECT * FROM `article` WHERE `id` = 477433 LIMIT 1 [ RunTime:0.004406s ]
  9. UPDATE `article` SET `lasttime` = 1772247011 WHERE `id` = 477433 [ RunTime:0.006131s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000380s ]
  11. SELECT * FROM `article` WHERE `id` < 477433 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000608s ]
  12. SELECT * FROM `article` WHERE `id` > 477433 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001032s ]
  13. SELECT * FROM `article` WHERE `id` < 477433 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000974s ]
  14. SELECT * FROM `article` WHERE `id` < 477433 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014861s ]
  15. SELECT * FROM `article` WHERE `id` < 477433 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005222s ]
0.107360s