feat: add append_klines for incremental chanlun analysis

- Store previous DataFrame in ChanlunAnalyser after process_klines
- Add append_klines(df_new) to concatenate and recompute
- Handles datetime deduplication automatically
- Raises RuntimeError if called before initial process_klines
- Add 2 tests: append + recompute, error without init

src/easy_tdx/chanlun/analyser.py

@@ -156,6 +156,7 @@ class ChanlunAnalyser:
             code=code,
             frequency=frequency,
         )
+        self._prev_df: pd.DataFrame | None = None
 
     @property
     def config(self) -> ChanlunConfig:
@@ -174,6 +175,7 @@ class ChanlunAnalyser:
         Returns:
             ChanlunResult 包含所有缠论计算结果
         """
+        self._prev_df = df.copy()
         # Step 1: DataFrame → Kline 列表
         klines = _df_to_klines(df)
         self._result.klines = klines
@@ -217,6 +219,39 @@ class ChanlunAnalyser:
 
         return self._result
 
+    def append_klines(self, df_new: pd.DataFrame) -> ChanlunResult:
+        """增量追加 K 线数据并重新计算。
+
+        将新数据追加到之前处理过的 DataFrame 后面，
+        然后在完整数据上重新执行缠论计算管道。
+
+        相比手动拼接 + process_klines 的优势：
+        - API 更简洁，无需用户管理 DataFrame 拼接
+        - 未来可优化为只重新计算受影响的部分
+
+        Args:
+            df_new: 新增的 K 线 DataFrame
+
+        Returns:
+            更新后的 ChanlunResult
+
+        Raises:
+            RuntimeError: 如果之前没有调用过 process_klines
+        """
+        if self._prev_df is None:
+            msg = "请先调用 process_klines() 初始化，再使用 append_klines()"
+            raise RuntimeError(msg)
+
+        # 拼接旧数据 + 新数据
+        combined = pd.concat([self._prev_df, df_new], ignore_index=True)
+
+        # 去重（防止重复追加）
+        if "datetime" in combined.columns:
+            combined = combined.drop_duplicates(subset=["datetime"], keep="last")
+            combined = combined.reset_index(drop=True)
+
+        return self.process_klines(combined)
+
     def get_bis(self) -> list[BI]:
         return self._result.bis
 

tests/unit/test_chanlun_phase3.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 from datetime import datetime
 
 import pandas as pd
+import pytest
 
 from easy_tdx.chanlun.bi import find_bis
 from easy_tdx.chanlun.fractal import find_fractals
@@ -147,6 +148,36 @@ class TestIncrementalUpdate:
         assert count2 == 100
         assert count2 > count1
 
+    def test_append_klines(self) -> None:
+        """append_klines 应追加数据并重新计算。"""
+        from easy_tdx.chanlun.analyser import ChanlunAnalyser
+
+        df1 = _make_df(30)
+        analyser = ChanlunAnalyser(code="SZ000001")
+        analyser.process_klines(df1)
+        count1 = len(analyser.result.klines)
+
+        df_new = _make_df(20)
+        # 使用不重复的日期
+        df_new["datetime"] = pd.date_range("2025-06-01", periods=20, freq="B")
+
+        analyser.append_klines(df_new)
+        count2 = len(analyser.result.klines)
+
+        # 追加后总数据量应增加
+        assert count2 >= count1
+        assert count2 == count1 + 20
+
+    def test_append_without_init_raises(self) -> None:
+        """未初始化时调用 append_klines 应抛异常。"""
+        from easy_tdx.chanlun.analyser import ChanlunAnalyser
+
+        analyser = ChanlunAnalyser(code="SZ000001")
+        df_new = _make_df(10)
+
+        with pytest.raises(RuntimeError, match="请先调用 process_klines"):
+            analyser.append_klines(df_new)
+
 
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