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[Mod] update version number to 3.9.4
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CHANGELOG.md

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# 3.9.4版本
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## 新增
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1. vnpy_tora增加登录时终端动态密钥支持
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2. vnpy_taos升级支持TDengine的3.0版本
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## 调整
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1. vnpy_xt行情接口增加实时行情中的涨跌停价字段
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2. vnpy_taos移除不必要的时区转换提高性能
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3. vnpy_dolphindb优化写入大量数据时候的内存占用
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4. vnpy_portfoliostrategy简化回测引擎的calculate_pnl每日盈亏计算函数
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5. vnpy_tap/vnpy_tts升级pybind11封装工具库的版本,支持Python 3.12编译
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6. EmailEngine发送邮件失败后,捕捉异常并输出日志
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## 修复
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1. vnpy_optionmaster移除不必要的价格缓存代码
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2. vnpy_dolphindb修复保存overview的时区不正确问题
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# 3.9.3版本
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## 新增

README.md

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💬 Want to read this in **english** ? Go [**here**](README_ENG.md)
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<p align="center">
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<img src ="https://img.shields.io/badge/version-3.9.3-blueviolet.svg"/>
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<img src ="https://img.shields.io/badge/version-3.9.4-blueviolet.svg"/>
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<img src ="https://img.shields.io/badge/platform-windows|linux|macos-yellow.svg"/>
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<img src ="https://img.shields.io/badge/python-3.10|3.11.|3.12-blue.svg" />
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<img src ="https://img.shields.io/github/actions/workflow/status/vnpy/vnpy/pythonapp.yml?branch=master"/>
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## 环境准备
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* 推荐使用VeighNa团队为量化交易专门打造的Python发行版[VeighNa Studio-3.9.3](https://download.vnpy.com/veighna_studio-3.9.3.exe),集成内置了VeighNa框架以及VeighNa Station量化管理平台,无需手动安装
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* 推荐使用VeighNa团队为量化交易专门打造的Python发行版[VeighNa Studio-3.9.4](https://download.vnpy.com/veighna_studio-3.9.4.exe),集成内置了VeighNa框架以及VeighNa Station量化管理平台,无需手动安装
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* 支持的系统版本:Windows 11以上 / Windows Server 2019以上 / Ubuntu 22.04 LTS以上
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* 支持的Python版本:Python 3.10以上(64位),**推荐使用Python 3.10**
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README_ENG.md

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</p>
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<p align="center">
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<img src ="https://img.shields.io/badge/version-3.9.3-blueviolet.svg"/>
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<img src ="https://img.shields.io/badge/version-3.9.4-blueviolet.svg"/>
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<img src ="https://img.shields.io/badge/platform-windows|linux|macos-yellow.svg"/>
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<img src ="https://img.shields.io/badge/python-3.10|3.11|3.12-blue.svg" />
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<img src ="https://img.shields.io/github/actions/workflow/status/vnpy/vnpy/pythonapp.yml?branch=master"/>

vnpy/__init__.py

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# SOFTWARE.
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__version__ = "3.9.3"
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__version__ = "3.9.4"

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