Openpyxl

Overview

Openpyxl is a Python library for reading and writing Excel 2010+ xlsx/xlsm files. This skill covers comprehensive patterns for spreadsheet automation including:

• Workbook creation with multiple worksheets
• Cell operations including formatting, merging, and data validation
• Formula support for calculations and dynamic content
• Chart generation for data visualization within Excel
• Conditional formatting for visual data analysis
• Large dataset handling with optimized read/write modes
• Pivot table creation for data summarization
• Style management for professional appearances

When to Use This Skill

USE when:

• Creating Excel reports with formulas and calculations
• Generating spreadsheets from database queries
• Automating financial reports and dashboards
• Building Excel templates with formatting
• Processing and transforming existing Excel files
• Creating charts and visualizations in Excel
• Applying conditional formatting rules
• Building data entry forms with validation
• Handling large datasets (100k+ rows)
• Creating pivot tables programmatically

DON'T USE when:

• Only need to read data into pandas (use pandas.read_excel directly)
• Need real-time Excel manipulation (use xlwings on Windows)
• Working with .xls format (use xlrd/xlwt)
• Creating complex macros (requires VBA)
• Need Excel-specific features like Power Query

Prerequisites

Installation

# Basic installation
pip install openpyxl

# Using uv (recommended)
uv pip install openpyxl

# With image support
pip install openpyxl Pillow


*See sub-skills for full details.*
### Verify Installation

```python
from openpyxl import Workbook, load_workbook
from openpyxl.styles import Font, PatternFill, Alignment, Border
from openpyxl.chart import BarChart, LineChart, PieChart
from openpyxl.utils.dataframe import dataframe_to_rows

print("openpyxl installed successfully!")

Version History

1.0.0 (2026-01-17)

• Initial skill creation
• Core capabilities documentation
• 6 complete code examples
• Large dataset handling patterns
• Integration with pandas

Resources

• Official Documentation: https://openpyxl.readthedocs.io/
• GitHub Repository: https://github.com/theorchard/openpyxl
• PyPI Package: https://pypi.org/project/openpyxl/

Related Skills

• pandas-data-processing - Data analysis and transformation
• python-docx - Word document generation
• plotly - Interactive chart generation
• pypdf - PDF manipulation

This skill provides comprehensive patterns for Excel automation refined from production data processing systems.

Sub-Skills

• 1. Basic Workbook Creation
• 2. Advanced Cell Formatting
• 3. Chart Generation
• 4. Conditional Formatting
• 5. Large Dataset Handling with Streaming
• 6. Pivot Table Creation
• Pandas Integration (+1)
• 1. Memory Management (+2)
• Common Issues