capo 0.3

Capo: A Python Library for Guitar Chord Transposition

Capo: A Python Library for Guitar Chord Transposition

Overview

Capo is a lightweight Python library for guitarists and developers that provides precise chord transposition across capo positions. It allows users to easily convert chord progressions from one capo setting to another, supporting sharps, flats, complex chord types, and slash chords. Whether you’re building a songwriting assistant, a practice tool, or a music theory application, Capo delivers a clear, reliable foundation for working with chord mappings and capo calculations in Python.

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Installation

Source Code

• Download Version 0.3 or Latest Source
• pip install .

PyPI

• Check Python Packaging User Guide
• pip install capo==0.3

Usage

Capo Map

>>> from capo import capo_map
>>> capo_map(["A", "Em", "C", "G"], target_capo=2, current_capo=0)
['G', 'Dm', 'A#', 'F']
>>> capo_map(["A", "Em", "C", "G"], target_capo=2, current_capo=0, flat_mode=True)
['G', 'Dm', 'Bb', 'F']

Transpose

>>> from capo import transpose
>>> transpose(["A", "E", "Cm", "G", "Fmaj7"], semitones=3)
['C', 'G', 'D#m', 'A#', 'G#maj7']
>>> transpose(["A", "E", "Cm", "G", "Fmaj7"], semitones=3, flat_mode=True)
['C', 'G', 'Ebm', 'Bb', 'Abmaj7']

Issues & Bug Reports

Just fill an issue and describe it. We'll check it ASAP!

• Please complete the issue template

References

1- Guitar chords capo calculator - GuitarPlayerBox

2- Enharmonic Equivalents - Music Theory Academy

3- Capo Calculator

4- Chord Transposer: Online Tool to Transpose Chords

5- Enharmonic Equivalent Chart with Enharmonic Note Names

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

Unreleased

0.3 - 2025-11-26

Added

• Double sharp notes
• Double flat notes

Changed

• Fb bug fixed
• Cb bug fixed
• E# bug fixed
• B# bug fixed
• README.md updated
• Test system modified

0.2 - 2025-11-15

Added

• transpose function
• Logo

Changed

• README.md updated
• capo_map function modified
• Test system modified

0.1 - 2025-11-05

Added

• capo_map function
• Flat notes
• Sharp notes