feat: 修复报错

python-app/app/strategies/sma_cross.py

@@ -0,0 +1,22 @@
+from __future__ import annotations
+
+import backtrader as bt
+
+
+class SmaCrossStrategy(bt.Strategy):
+    params = (
+        ("fast", 3),
+        ("slow", 8),
+        ("stake", 1),
+    )
+
+    def __init__(self) -> None:
+        self.fast_sma = bt.indicators.SMA(self.data.close, period=self.params.fast)
+        self.slow_sma = bt.indicators.SMA(self.data.close, period=self.params.slow)
+        self.cross_signal = bt.indicators.CrossOver(self.fast_sma, self.slow_sma)
+
+    def next(self) -> None:
+        if not self.position and self.cross_signal > 0:
+            self.buy(size=self.params.stake)
+        elif self.position and self.cross_signal < 0:
+            self.close()