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Changelog

All notable changes to Modeleon will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.1.3] — 2026-04-27

Metadata-only release.

  • PyPI Documentation URL now points to the GitHub README (github.com/modeleonai/modeleon#readme) instead of the unbuilt modeleon.ai/docs page. No code or behavior changes.

[0.1.2] — 2026-04-27

First public release.

(0.1.0 / 0.1.1 existed on PyPI as name-reservation stubs with a narrow placeholder API. Upgrade directly to 0.1.2 if you have one of those installed — the API is different.)

What ships

  • Two primitives. Variable and MultiVariable. Operator overloading on Variable builds a dependency graph; arithmetic, comparisons, and method calls all produce live Excel formulas in the output, not dead values.
  • Excel output via model.to_excel(path). Every computed cell is a live formula referencing the right cells. Cross-sheet references (assumptions.tax_rate) resolve as ='Assumptions'!B2 in the output.
  • Function library. IF, SUM, MAX, MIN, AVERAGE, ABS, ROUND, INT, MOD, LEN, UPPER, LOWER, CONCAT, YEAR, MONTH, DAY, EDATE, EOMONTH, TODAY, IRR, NPV, XIRR, PMT, FV, PV. Each emits the expected Excel formula (=SUM(B2:F2), =IRR(B2:F2, 0.1), etc.).
  • Roll-forward primitives. self_ref for period-over-period recurrence ({prev} * (1 - {churn}) + {new}), self_ref_sum for cumulative running totals, cumsum for simple running sums.
  • Reusable templates. MultiVariableClass for parameterized components (cohorts, schedules) instantiated multiple times.
  • Units with algebra. Unit('$'), Unit('hr'), Unit('$/hr') propagate through arithmetic. Mixed-unit addition raises.
  • JSON serialization. mo.to_json(expr) renders the AST as a renderer-neutral dict — useful for diff views, web grids, LLM inspection.
  • Notebook _repr_html_. Tabbed sheet UI, click-to-reveal formulas, trace-precedents on focus, formula/value toggle.