19 lines
509 B
Python
19 lines
509 B
Python
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"""Ports that keep selection formulas independent from storage technology."""
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from __future__ import annotations
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from datetime import date
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from typing import Protocol
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from .models import StockHistory
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class MarketDataReaderError(RuntimeError):
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"""A market-data adapter could not complete a read."""
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class MarketDataReader(Protocol):
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"""Read qfq history sufficient for one historical strategy evaluation."""
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def load_history(self, ts_code: str, target_trade_date: date) -> StockHistory: ...
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