fix: pandas 3.0 compatibility (frequency alias migration) - #6
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pandas 3.0 removed the deprecated single-letter offset aliases, which
broke the financial-analysis and data-processing code paths (26 errors
in the Flask simulation integration tests on a fresh install, since
pip resolves pandas to 3.x with no upper bound).
Replace the removed aliases with their 2.2+ equivalents:
- freq="T" -> freq="min" (8 date_range call sites)
- resample("M") / "M" period literals -> "ME"
- freq="H" / resample("1H") -> "h" / "1h"
Bump the pandas floor to >=2.2 in pyproject.toml and setup.py, since
the "min"/"ME"/"h" aliases require pandas 2.2+. Also add venv/ and
.venv/ to .gitignore so a locally-created virtualenv is not tracked.
Full fast test suite: 1503 passed, 2 xfailed (was 1477 passed + 26
errored before the fix).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
mendesfabio
approved these changes
Jul 10, 2026
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Problem
On a fresh clone +
pip install -e ".[dev]", the dependency resolver installs pandas 3.0 (thepandasfloor was>=1.3.6with no upper bound). pandas 3.0 removed the long-deprecated single-letter offset aliases, which breaks the financial-analysis and data-processing code paths.Symptom: 26 errors in
tests/integration/test_flask_run_simulation.py, e.g.:Fix
Migrate the removed aliases to their pandas-2.2+ equivalents:
freq="T"freq="min"pd.date_rangecall sitesresample("M")/"M"period literals"ME"financial_analysis_functions.pyfreq="H"/resample("1H")"h"/"1h"historic_data_utils.py"D"and"W"are unchanged (still valid in pandas 3.0). The new aliases require pandas ≥2.2, so thepandasfloor is bumped to>=2.2in bothpyproject.tomlandsetup.py.Also adds
venv/and.venv/to.gitignore(an in-repo virtualenv was otherwise showing up as untracked).Testing
Fast suite (
pytest -m "not slow"):The 26 previously-failing Flask integration tests now pass.