commit 2fb7f44f8ac9dfdce2b8e997f8524596e4ebe00c
Author: hubian <908234780@qq.com>
Date:   Wed Mar 25 18:15:27 2026 +0800

    Initial commit: stock formatter tool

diff --git a/stock_formatter.py b/stock_formatter.py
new file mode 100644
index 0000000..97253c0
--- /dev/null
+++ b/stock_formatter.py
@@ -0,0 +1,106 @@
+#!/usr/bin/env python3
+"""
+股票代码格式化工具
+根据股票代码自动判断市场并添加后缀 (SZ/SH/BJ)
+"""
+
+
+def get_stock_exchange(stock_code: str) -> str:
+    """
+    根据股票代码判断所属交易所
+    
+    Args:
+        stock_code: 纯数字股票代码，如 "000001", "600000"
+    
+    Returns:
+        交易所缩写: "SZ" | "SH" | "BJ" | None
+    """
+    if not stock_code or not stock_code.isdigit():
+        return None
+    
+    code = stock_code.strip()
+    
+    # 沪市 (SH)
+    # - 600, 601, 603, 605: 主板
+    # - 688, 689: 科创板
+    # - 900: B股
+    if code.startswith(('600', '601', '603', '605', '688', '689', '900')):
+        return "SH"
+    
+    # 深市 (SZ)
+    # - 000, 001: 主板
+    # - 002, 003: 中小板/合并后主板
+    # - 300: 创业板
+    # - 200: B股
+    if code.startswith(('000', '001', '002', '003', '300', '200')):
+        return "SZ"
+    
+    # 北交所 (BJ)
+    # - 8 开头: 43, 83, 87, 88 等
+    if code.startswith('8') or code.startswith('4'):
+        return "BJ"
+    
+    return None
+
+
+def format_stock_code(stock_code: str) -> str:
+    """
+    将纯数字股票代码格式化为 代码.市场 格式
+    
+    Args:
+        stock_code: 纯数字股票代码，如 "000001"
+    
+    Returns:
+        格式化后的代码，如 "000001.SZ"
+    
+    Raises:
+        ValueError: 无法识别市场时抛出
+    """
+    code = stock_code.strip()
+    
+    exchange = get_stock_exchange(code)
+    if exchange is None:
+        raise ValueError(f"无法识别的股票代码: {stock_code}")
+    
+    return f"{code}.{exchange}"
+
+
+def format_stock_codes(stock_codes: list[str]) -> list[str]:
+    """
+    批量格式化股票代码
+    
+    Args:
+        stock_codes: 股票代码列表
+    
+    Returns:
+        格式化后的代码列表
+    """
+    results = []
+    for code in stock_codes:
+        try:
+            formatted = format_stock_code(code)
+            results.append(formatted)
+        except ValueError as e:
+            results.append(f"ERROR: {e}")
+    return results
+
+
+if __name__ == "__main__":
+    # 测试示例
+    test_codes = [
+        "000001",   # 平安银行 - 深市
+        "600000",   # 浦发银行 - 沪市
+        "688981",   # 中芯国际 - 沪市(科创板)
+        "300750",   # 宁德时代 - 深市(创业板)
+        "835185",   # 贝特瑞 - 北交所
+        "12345",    # 无效代码
+    ]
+    
+    print("股票代码格式化测试:")
+    print("-" * 30)
+    for code in test_codes:
+        try:
+            result = format_stock_code(code)
+            print(f"{code} -> {result}")
+        except ValueError as e:
+            print(f"{code} -> {e}")