---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: python_udf
excerpt: |
  DuckDB Community Extensions
  Embedded CPython UDFs for DuckDB — py_eval, py_agg, py_scan, py_register, py_call, py_map

extension:
  name: python_udf
  description: "Embedded CPython UDFs for DuckDB — py_eval, py_agg, py_scan, py_register, py_call, py_map"
  version: 0.2.0
  language: Rust & Python
  build: cargo
  license: MIT
  requires_toolchains: rust;python3
  maintainers:
    - alitrack
  excluded_platforms: "linux_amd64_musl;wasm_eh;wasm_mvp;wasm_threads;windows_amd64_mingw;windows_amd64_rtools"

repo:
  github: alitrack/duckdb-python
  ref: 901a7bdbc3a1b7f760882eeb91b6716e4b136cc2
  ref_next: 901a7bdbc3a1b7f760882eeb91b6716e4b136cc2

docs:
  hello_world: |
    LOAD python_udf;
    SELECT py_eval('lambda x: x * 2 + 1', x) FROM range(10) t(x);

    -- Aggregate UDF
    SELECT py_agg('sum', x) FROM range(100) t(x);

    -- Scan from Python
    SELECT * FROM py_scan('lambda _: [{"a":1}, {"a":2}]');

    -- Register persistent UDF
    SELECT py_register('dbl', 'lambda x: x * 2');

    -- Call registered UDF
    SELECT py_call('dbl', 21);

    -- Map values
    SELECT py_map('ord', 'hello world');

  extended_description: |
    ## CPython UDFs for DuckDB

    Execute Python code directly in SQL queries with CPython embedded in DuckDB.

    **7 Functions:**

    | Function | Type | Description |
    |----------|------|-------------|
    | `py_eval(name, arg..)` | Scalar | Evaluate Python lambda/function per row |
    | `py_agg(name, arg)` | Aggregate | Full-table aggregate UDF |
    | `py_scan(func)` | Table | Generate rows from Python |
    | `py_register(name, func)` | Management | Register a Python UDF |
    | `py_call(name, arg..)` | Scalar | Call a registered UDF |
    | `py_map(func, arg..)` | Scalar | Map a function over values |
    | `py_list(name)` | Utility | List registered UDFs |

    **Design:**
    - CPython embedded via PyO3 (Rust FFI)
    - Fresh Python interpreter per DuckDB connection
    - Supports Python 3.11, 3.12, 3.13
    - macOS, Linux x64 supported

    **Note:** Extension binary name is `python_udf` to avoid collision
    with DuckDB's core `python` extension.
    The source repository remains `duckdb-python`.

extension_star_count: 8
extension_star_count_pretty: 8
extension_download_count: 736
extension_download_count_pretty: 736
image: '/images/community_extensions/social_preview/preview_community_extension_python_udf.png'
layout: community_extension_doc
---
### Compatibility Matrix

This table covers all DuckDB releases that have not reached [end-of-life](https://duckdb.org/release_calendar), including LTS releases, and shows the 2 most recent patch releases of each. Older patch releases are not listed, but the extension may be available for them as well.

<div class="extension_compatibility_table"></div>

| Platform | 1.4.4 | 1.4.5 | 1.5.5 | 1.5.6 | 2.0.0 |
| :--- | :---: | :---: | :---: | :---: | :---: |
| Linux AMD64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| Linux ARM64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| macOS AMD64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| macOS ARM64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| Windows AMD64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| Windows ARM64 | ❌ | ❌ | ❌ | ❌ | ❌ |
| WebAssembly | ❌ | ❌ | ❌ | ❌ | ❌ |

### Installing and Loading
```sql
INSTALL {{ page.extension.name }} FROM community;
LOAD {{ page.extension.name }};
```

{% if page.docs.hello_world %}
### Example
```sql
{{ page.docs.hello_world }}```
{% endif %}

{% if page.docs.extended_description %}
### About {{ page.extension.name }}
{{ page.docs.extended_description }}
{% endif %}
### Added Functions

<div class="extension_functions_table"></div>

This extension does not add any functions.

### Overloaded Functions

<div class="extension_functions_table"></div>

This extension does not add any function overloads.

### Added Types

<div class="extension_types_table"></div>

This extension does not add any types.

### Added Settings

<div class="extension_settings_table"></div>

This extension does not add any settings.