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LiteQuant Python client SDK

Project description

LiteQuant Python SDK

LiteQuant Python SDK 用于在本地下载和读取 LiteQuant 数据。SDK 会自动处理连接、同步、本地 Parquet 缓存和常见错误提示。

支持 Python 3.8 及以上版本。

Installation

pip install litequant

Quick Start

from litequant import LiteQuantClient

client = LiteQuantClient(
    api_token="your_api_token",
    save_path="./litequant_data",
)

client.UpdateAllCategory(update_method="incremental")
df = client.GetCategory("cn_stock_pivot#open")
print(df.tail())

client.close()

推荐使用上下文管理器自动关闭连接:

from litequant import LiteQuantClient

with LiteQuantClient(api_token="your_api_token", save_path="./litequant_data") as client:
    categories = client.ListCategories()
    df = client.GetCategory(categories[0])

默认 API 地址为 https://www.litequant.pro。如需连接测试环境,可以传入 api_url 或设置环境变量 LITEQUANT_API_URL

Error Handling

SDK 默认会在 Python 终端输出功能面错误提示,同时抛出类型化异常。错误信息不会展示后端细节。

from litequant import LiteQuantClient, LiteQuantError

try:
    with LiteQuantClient(api_token="your_api_token", save_path="./litequant_data") as client:
        df = client.GetCategory("cn_stock_pivot#open")
except LiteQuantError as exc:
    print(exc.code)
    print(exc.user_message)
    print(exc.retryable)

如果你希望完全自己处理错误提示,可以关闭终端输出:

client = LiteQuantClient(
    api_token="your_api_token",
    save_path="./litequant_data",
    display_errors=False,
)

常见公开错误码:

  • AUTH_INVALID:API 凭证无效或已过期
  • ACCOUNT_UNAVAILABLE:账号不可用
  • SUBSCRIPTION_UNAVAILABLE:套餐不可用或已过期
  • PERMISSION_DENIED:权限不足
  • CONNECTION_LIMIT:连接数已达上限
  • CONNECTION_INTERRUPTED:连接已中断,请重新连接
  • REQUEST_INVALID:请求参数无效
  • SERVICE_UNAVAILABLE:服务暂时不可用
  • DATA_UNAVAILABLE:数据暂时不可用
  • DATA_VERIFY_FAILED:数据校验失败

Data Cache

SDK 会把数据保存为本地 Parquet 缓存。再次读取同一数据类别时,会优先使用本地缓存;如果本地没有该数据类别,SDK 会自动同步。

当前 pivot 数据支持 monthlydaily 两种分区模式。后续可以在服务端元信息和客户端缓存层一起扩展更多分区模式。

Metadata Contract

数据服务会提供客户端可识别的类别列表、类别元信息和分区元信息。客户端会自动读取这些元信息并完成数据同步。

公开稳定字段包括:

  • partition_mode:pivot 分区模式,目前支持 monthlydaily
  • partition_keys:数据分区标识列表
  • hash:数据校验值
  • key_columns / dedupe_keys:unstack 数据去重键

普通用户通常不需要直接使用这些字段。

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