> ## Documentation Index
> Fetch the complete documentation index at: https://jmail.world/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# release_batches()

> 下载发布批次的元数据

```python theme={null}
client.release_batches() -> pd.DataFrame
```

下载发布批次元数据，包括批次名称、描述和发布日期。

## 返回值

包含发布批次数据的 `pd.DataFrame`。

## 示例

```python theme={null}
from jmail import JmailClient

client = JmailClient()
batches = client.release_batches()

# 按发布日期排序显示所有批次
print(batches.sort_values("released_at")[["name", "description", "released_at"]])
```

## 列

| 列 | 类型 | 描述 |
| - | - | - |
| `id` | int | 批次 ID |
| `name` | string | 批次名称（如 `VOL00009`、`DataSet11`） |
| `description` | string | 批次描述 |
| `released_at` | timestamp | 公开发布日期 |

## 直接链接

```
https://data.jmail.world/v1/release_batches.parquet
https://data.jmail.world/v1/release_batches.ndjson.gz
```


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