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Convert the ReadVars Fortran program into Python#11598

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readvars-python
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Convert the ReadVars Fortran program into Python#11598
jasondegraw wants to merge 3 commits into
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readvars-python

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@jasondegraw jasondegraw commented May 21, 2026

Pull request overview

There have periodically been requests to translate the Fortran utilities to Python or C++, there's an issue here:

#6566

We haven't managed to get many of those converted for one reason or another. A few days ago, I needed to convert some ESOs into CSVs and I didn't have an installed copy of EnergyPlus or a Fortran compiler, but I did have the EnergyPlus source and the Codex agent pointed at it, so I asked Codex to write me a Python version of ReadVars so I could do the conversion. It's come up a few times before and I thought it'd be useful to have a Python version to stash someplace and use when I needed it.

Well, I guess the prompt I wrote was too open-ended: it nuked the Fortran and replaced it with the Python version that it wrote. @mbadams5 points out that Codex just did what I should have asked for. The -r switch now should invoke the Python version instead of "real" executable.

I'm going to put it in draft mode for now to see how it fairs in CI, and I want to do some testing of the performance beyond the basic Windows use that I have done already.

Pull Request Author

  • Title of PR should be user-synopsis style (clearly understandable in a standalone changelog context)
  • Label the PR with at least one of: Defect, Refactoring, NewFeature, Performance, and/or DoNoPublish
  • Pull requests that impact EnergyPlus code must also include unit tests to cover enhancement or defect repair
  • Author should provide a "walkthrough" of relevant code changes using a GitHub code review comment process
  • If any diffs are expected, author must demonstrate they are justified using plots and descriptions
  • If changes fix a defect, the fix should be demonstrated in plots and descriptions
  • If any defect files are updated to a more recent version, upload new versions here or on DevSupport
  • If IDD requires transition, transition source, rules, ExpandObjects, and IDFs must be updated, and add IDDChange label
  • If structural output changes, add to output rules file and add OutputChange label
  • If adding/removing any LaTeX docs or figures, update that document's CMakeLists file dependencies
  • If adding/removing any output files (e.g., eplustbl.*)
    • Update ..\scripts\Epl-run.bat
    • Update ..\scripts\RunEPlus.bat
    • Update ..\src\EPLaunch\ MainModule.bas, epl-ui.frm, and epl.vbp (VersionComments)
    • Update ...github\workflows\energyplus.py

Reviewer

  • Perform a Code Review on GitHub
  • If branch is behind develop, merge develop and build locally to check for side effects of the merge
  • If defect, verify by running develop branch and reproducing defect, then running PR and reproducing fix
  • If feature, test running new feature, try creative ways to break it
  • CI status: all green or justified
  • Check that performance is not impacted (CI Linux results include performance check)
  • Run Unit Test(s) locally
  • Check any new function arguments for performance impacts
  • Verify IDF naming conventions and styles, memos and notes and defaults
  • If new idf included, locally check the err file and other outputs

@jasondegraw jasondegraw added Refactoring Includes code changes that don't change the functionality of the program, just perform refactoring AuxiliaryTool Related to an auxiliary tool, not EnergyPlus itself (readvars, preprocessor, ep-launch, etc.) labels May 21, 2026
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AuxiliaryTool Related to an auxiliary tool, not EnergyPlus itself (readvars, preprocessor, ep-launch, etc.) Refactoring Includes code changes that don't change the functionality of the program, just perform refactoring

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