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PyXLL Documentation

PyXLL is the Python Excel Add-In — a native Excel add-in that lets you write Excel

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T23:00:05.955Z. Cached copy · Source on pyxll.com

# PyXLL Documentation

> PyXLL is the Python Excel Add-In — a native Excel add-in that lets you write Excel
> worksheet functions, macros, menus, ribbon toolbars, and real-time data feeds entirely
> in Python, with no VBA required.

PyXLL runs Python in-process inside Microsoft Excel, giving direct access to the full
Python ecosystem — numpy, pandas, SciPy, matplotlib, plotly, and more — from Excel
formulas and macros. It is used in finance, engineering, data science, and research to
extend Excel with Python without leaving the spreadsheet environment.

Key capabilities:

- **Worksheet functions (UDFs):** expose Python functions as Excel formulas using the
  `@xl_func` decorator, with full support for type hints, NumPy arrays, pandas/polars
  DataFrames, async functions, and the LRU cache.
- **Macros:** define Excel macros in Python with `@xl_macro`; interact with the Excel
  Object Model, read/write cells, and assign keyboard shortcuts.
- **Real-time data (RTD):** stream live data into Excel cells from Python using the
  `RTD` class or generator-based `rtd_func`.
- **Plotting:** embed matplotlib, plotly, bokeh, altair, and seaborn charts directly
  in Excel worksheets via the `plot()` function.
- **Custom task panes & ActiveX controls:** build side-panel or worksheet UIs using
  Qt (PySide/PyQt), tkinter, or wxPython.
- **Ribbon & menus:** customise the Excel ribbon toolbar and Add-ins menu from Python.
- **Configuration:** all behaviour is controlled via a plain-text `pyxll.cfg` file.

This file is a structured index of the PyXLL documentation. Each entry links to a
standalone Markdown (.md) file containing the full text of that page. For the entire
documentation concatenated into one file see
[llms-full.txt](https://www.pyxll.com/llms-full.txt).

Navigation guide for AI assistants:

- **Getting started / installation:** see the *Getting Started* entries at the top and
  the *Installing PyXLL* section.
- **Writing worksheet functions or macros:** see *Worksheet Functions* and
  *Macro Functions* under the User Guide.
- **Configuration questions:** see *Configuring PyXLL* and its subsections.
- **API signatures and parameters:** see the *API Reference* section.
- **Version history and release notes:** see the *Changelog* section.

---

- [PyXLL Documentation - The Python Add-In for Microsoft Excel](https://www.pyxll.com/docs/index.md): Complete documentation for PyXLL, the Python add-in for Microsoft Excel. Covers worksheet functions, macros, real-time data, ribbon toolbars, and more.
- [Getting Started with PyXLL](https://www.pyxll.com/docs/introduction.md): Step-by-step getting started guide for PyXLL — install the add-in with pip, write your first Python worksheet function, and call it directly from an Excel cell.
- [What’s new in PyXLL 5](https://www.pyxll.com/docs/whatsnew.md): Overview of new features and improvements in PyXLL 5, including Excel tables, RTD generators, Polars support, custom task panes, plotting integrations, and the LRU c
…

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