Modeleon – Python DSL that compiles to live Excel formulas

Name: Modeleon – Python DSL that compiles to live Excel formulas
Availability: InStock
Author: adilkhanovkz

by adilkhanovkz·May 1, 2026·6 points·0 comments

Visit Project View on HN

AI Analysis

●●●BangerBig BrainSolve My Problem

Finally, a Python DSL that outputs real Excel formulas instead of baked values.

Strengths

•Operator overloading automatically tracks cross-cell dependency graphs.
•Walker/Renderer split allows targeting backends beyond just Excel.
•Solves the auditability gap between Python models and CFO-ready spreadsheets.

Weaknesses

•Pre-alpha API instability means breaking changes before 1.0.
•Niche audience limits adoption to finance teams comfortable with Python.

Post Description

Hi HN. Modeleon is an open-source Python DSL for financial models. You write models in Python with named variables and operator-overloaded arithmetic, and it compiles to a real .xlsx with live formulas — not values, but formulas like =B4*B5 that the CFO can audit in Excel.

The architectural bet is "model is the source of truth, spreadsheet is one rendering." We have a Walker/Renderer split so the same model can target Excel today and other backends later.

We've been building this for finance + Python developers (CFA candidates with Python skills, FP&A analysts who automate). It's pre-alpha — works, but the API will change before 1.0.

Apache 2.0. PyPI: pip install modeleon. Happy to answer questions.