compare-cpython-versions

npx skills add majiayu000/claude-skill-registry --skill compare-cpython-versions --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# Compare CPython Versions Skill This skill helps compare CPython source code between two Python versions to identify changes in headers, structs, and APIs that affect our codebase. ## When to Use This Skill Use this skill when: - Adding support for a new Python version - Need to understand what changed between versions - Investigating compatibility issues - Have a list of headers/structs from `find-cpython-usage` skill ## Key Principles 1. **Compare systematically** - Focus on headers and structs identified in Step 1 2. **Use multiple methods** - Git diff, manual diff, or AI-assisted comparison 3. **Document changes** - Note all breaking changes and API modifications 4. **Check context** - Understand why changes were made (PEPs, GitHub issues) ## How This Skill Works ### Step 1: Prepare CPython Repository ```bash # Create ~/dd directory if it doesn't exist mkdir -p ~/dd # Clone CPython repository if needed (to ~/dd/cpython) if [ ! -d ~/dd/cpython ]; then git clone https://github.com/python/cpython.git ~/dd/cpython cd ~/dd/cpython git fetch --tags else cd ~/dd/cpython # Update existing repository git fetch --tags git fetch origin fi ``` ### Step 2: Compare Specific Headers Using th

Create ~/dd directory if it doesn't exist
mkdir -p ~/dd
Clone CPython repository if needed (to ~/dd/cpython)
if [ ! -d ~/dd/cpython ]; then
git clone https://github.com/python/cpython.git ~/dd/cpython
cd ~/dd/cpython
git fetch --tags
else
git fetch origin
fi