Add advanced openpyxl chapter

[RamonRDR]

Summary

• add Phase 9 · Chapter 02, Automating Excel Workbooks with openpyxl, in English, Brazilian Portuguese, and Spanish
• target the current openpyxl 3.1.x series and validate against openpyxl 3.1.5
• extend requirements-external.txt with openpyxl>=3.1,<3.2
• cover workbook/worksheet/cell operations, formulas versus cached values, styles, number formats, tables, data validation, optimized read/write modes, VBA-preservation boundaries, structural-edit risks, round-trip fidelity, output validation, and untrusted-workbook security considerations
• add five deterministic executable workbook examples that do not require Microsoft Excel
• synchronize Phase 9 navigation, localized status documents, roadmaps, learning paths, project-structure docs, the pandas → openpyxl handoff, and the approved-example manifest
• mark pandas and openpyxl complete within Phase 9, with requests and pytest planned next

Chapter shape

• 67 numbered sections per language
• 25 fenced Python blocks, identical across EN / PT-BR / ES
• estimated study time: 240–330 minutes
• five new executable examples:
  • workbook_basics.py
  • load_and_iterate.py
  • styled_report.py
  • table_and_validation.py
  • write_only_export.py

Dependency contract

• pandas>=3.0,<3.1
• openpyxl>=3.1,<3.2
• openpyxl 3.1.5 declares Python 3.8+
• repository validation continues on Python 3.13

Validation

• branch is based exactly on main at fe1fae7463fe0eb7cb4ca30a42e81007f4d0b454
• corrected clean HEAD: b9bb18897537cbc969b3bea8b67b975a1881b328
• one focused commit, 28 changed files
• CPython 3.13.15
• pandas 3.0.5
• openpyxl 3.1.5
• all 25 fenced Python blocks are identical across EN / PT-BR / ES
• all three chapters contain exactly 67 numbered sections
• all 11 repository quality-script tests passed
• all 166 approved Python examples passed
• exact output of all five openpyxl examples passed
• 2,226 internal links across 228 Markdown files passed
• repository structure validation passed
• git diff --check passed
• temporary synchronization/review-fix scripts and workflows were removed before the clean final commit
• official PR CI passed on corrected HEAD (Repository quality checks run #505)

Review follow-up

• addressed Codex P2 about invalid-workbook exception handling
• the chapter now catches zipfile.BadZipFile and openpyxl.utils.exceptions.InvalidFileException explicitly, while preserving OSError handling for file I/O failures
• the identical corrected snippet is present in EN / PT-BR / ES
• original review thread was answered and resolved
• second @codex review requested on the corrected HEAD

References

Primary references are the current official openpyxl documentation and tutorial, optimized-mode, styles, tables, data-validation, and worksheet-editing documentation, plus the openpyxl PyPI release metadata. Version-sensitive behavior and important limitations are documented explicitly.

[RamonRDR]

@codex review

[chatgpt-codex-connector]

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Reviewed commit: 0d4a9a0b75

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[RamonRDR]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: b9bb188975

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".