A library to handle musical chords in python.
Project description
PyChord 
Overview
Pychord is a python library to handle musical chords.
Installation
$ pip install pychord
Basic Usage
Create a Chord
>>> from pychord import Chord
>>> c = Chord("Am7")
>>> c
<Chord: Am7>
>>> c.info()
"""
Am7
root=A
quality=m7
appended=[]
on=None
"""
Transpose a Chord
>>> c = Chord("Am7/G")
>>> c.transpose(3)
>>> c
<Chord: Cm7/Bb>
Get component notes
>>> c = Chord("Am7")
>>> c.components()
['A', 'C', 'E', 'G']
>>> c.components_with_pitch(root_pitch=3)
['A3', 'C4', 'E4', 'G4']
Compare Chords
>>> Chord("C") == Chord("D")
False
>>> Chord("C#") == Chord("Db")
True
>>> c = Chord("C")
>>> c.transpose(2)
>>> c == Chord("D")
True
Find Chords from notes
>>> from pychord import find_chords_from_notes
>>> find_chords_from_notes(["C", "E", "G"])
[ <Chord: C>]
>>> find_chords_from_notes(["F#", "A", "C", "D"])
[ <Chord: D7/F#>]
>>> find_chords_from_notes(["F", "G", "C"])
[ <Chord: Fsus2>, <Chord: Csus4/F>]
Create and handle chord progressions
>>> from pychord import ChordProgression
>>> cp = ChordProgression(["C", "G/B", "Am"])
>>> cp
<ChordProgression: C | G/B | Am>
>>> cp.append("Em/G")
>>> cp
<ChordProgression: C | G/B | Am | Em/G>
>>> cp.transpose(+3)
>>> cp
<ChordProgression: Eb | Bb/D | Cm | Gm/Bb>
>>> cp[1]
<Chord: Bb/D>
Advanced Usage
Create a Chord from note index in a scale
>>> Chord.from_note_index(note=1, quality="", scale="Cmaj")
<Chord: C> # I of C major
>>> Chord.from_note_index(note=3, quality="m7", scale="Fmaj")
<Chord: Am7> # IIIm7 of F major
>>> Chord.from_note_index(note=5, quality="7", scale="Amin")
<Chord: E7> # V7 of A minor
Overwrite the default Quality components with yours
>>> from pychord import Chord, QualityManager
>>> Chord("C11").components()
['C', 'G', 'Bb', 'D', 'F']
>>> quality_manager = QualityManager()
>>> quality_manager.set_quality("11", (0, 4, 7, 10, 14, 17))
>>> Chord("C11").components()
['C', 'E', 'G', 'Bb', 'D', 'F']
Inversions
Chord inversions are created with a forward slash and a number indicating the order. This can optionally be combined with an additional forward slash to change the bass note:
>>> Chord("C/1").components() # First inversion of C
['E', 'G', 'C']
>>> Chord("C/2").components() # Second inversion of C
['G', 'C', 'E']
>>> Chord("Cm7/3/F").components() # Third inversion of Cm7 with an added F bass
['F', 'Bb', 'C', 'Eb', 'G']
Examples
- pychord-midi.py - Create a MIDI file using PyChord and pretty_midi.
Supported Python Versions
- 3.6 and above
Python 2.7 and 3.5 compatibility was dropped from version 1.0.0.
Links
- PyPI: https://pypi.python.org/pypi/pychord
- GitHub: https://github.com/yuma-m/pychord
- Documentation: http://pychord.readthedocs.io/en/latest/
Author
License
- MIT License
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