excel-openpyxl-formulas SKILL.md skillA
excel-openpyxl-formulas from cxcscmu/skilllearnbench is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cxcscmu/skilllearnbench/excel-openpyxl-formulas@git:20260424.d50cf5aPins git:20260424.d50cf5a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cxcscmu/skilllearnbench
- Path
skills/b1-one-shot-claude-sonnet-4-6/weighted-gdp-calculation/excel-openpyxl-formulas/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260424.d50cf5a, committed Apr 24, 2026
- Size
- 3,088 bytes
- Repository stars
- 91
- License
- MIT
Editing Excel files with openpyxl to insert formulas while preserving all existing formatting, styles, colors, and structure.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# openpyxl: Insert Formulas While Preserving Formatting
## Critical Rule: Load Without data_only
```python
from openpyxl import load_workbook
# CORRECT: preserves formulas and formatting
wb = load_workbook('file.xlsx')
# WRONG: replaces formulas with cached values on save
wb = load_workbook('file.xlsx', data_only=True)
```
## Basic Formula Insertion
```python
wb = load_workbook('file.xlsx')
ws = wb['Sheet1']
ws['H12'] = '=INDEX(Data!$H$21:$M$40,MATCH($D12,Data!$B$21:$B$40,0),MATCH(H$10,Data!$H$4:$M$4,0))'
wb.save('file.xlsx')
```
## Iterating Over Cell Ranges
When applying similar formulas to a grid of cells, iterate using row/column indices:
```python
from openpyxl.utils import get_column_letter
# Fill a range (e.g., H12:L17) with formulas
start_row = 12
end_row = 17
start_col = 8 # H = column 8
end_col = 12 # L = column 12
for row in range(start_row, end_row + 1):
for col in range(start_col, end_col + 1):
col_letter = get_column_letter(col)
cell = ws.cell(row=row, column=col)
cell.value = f'=INDEX(Data!$I$21:$M$40,MATCH($D{row},Data!$B$21:$B$40,0),MATCH({col_letter}$10,Data!$I$4:$M$4,0))'
```
## Preserving Cell Formatting
…Read the whole file at its exact version.
How to install
mdr add cxcscmu/skilllearnbench/excel-openpyxl-formulas@sha256:99b72549969cea96The line at the top of this page pins the label git:20260424.d50cf5a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4nhvby4p6zzmol2z)
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Versions
The registry has recorded 1 version of this file, committed on Apr 24, 2026.
Audit of the latest version
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Source
cxcscmu/skilllearnbench · 91 stars · license MIT · pushed 2026-10-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4nhvby4p6zzmol2z GET https://markdownregistry.com/api/v1/resolve?ref=cxcscmu/skilllearnbench/excel-openpyxl-formulas GET https://markdownregistry.com/api/v1/blob/99b72549969cea964e9472d8f9c3ac300608794b99ab64b44f0b86ca26ab8e51
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Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.