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docs(core): document the exchange key convention on BtApi #6

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docs(core): document the exchange key convention on BtApi #6

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5 changes: 5 additions & 0 deletions bt_api_py/bt_api.py
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"""
Integrate all exchange APIs using this BtApi class
通过 ExchangeRegistry 实现交易所的即插即用，新增交易所无需修改此文件

Exchange key convention (exchange_kwargs / get_tick dataname 前缀):
``EXCHANGE___MARKET_TYPE``, e.g. ``BINANCE___SPOT``、``CTP___FUTURE``。
三下划线为保留分隔符；订阅数据名追加 symbol：
``EXCHANGE___MARKET_TYPE___SYMBOL``。
"""

from __future__ import annotations
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