kennethreitz dff12678ba Fix music theory accuracy and core bugs across the library
- Fix Tone.__init__ overwriting explicit octave kwarg when parsing name
- Fix Tone.__eq__ calling names as attribute instead of method, add __hash__
- Fix octave arithmetic to use C-based boundaries (scientific pitch notation)
- Fix pitch() to account for octave (was ignoring it entirely)
- Fix modal scale generation: modes were overwritten due to DEGREES loop bug
- Fix modal offset rotation off-by-one in generate_scale
- Fix scales._scales property being called as function
- Fix chord intervals: major/minor thirds were swapped, added missing chord tones
- Remove broken duplicate NamedChord class in chords.py
- Expand test suite from 11 to 83 tests covering tones, scales, modes, chords,
  pitches, fingerings, and intervals

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-22 05:34:11 -04:00
2024-11-17 06:28:04 -05:00
2018-09-02 04:13:48 -04:00

PyTheory: Music Theory for Humans

This (work in progress) library attempts to make exploring music theory approachable to humans.

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True Scale -> Pitch Evaluation

>>> from pytheory import TonedScale

>>> c_minor = TonedScale(tonic='C4')['minor']

>>> c_minor
<Scale I=C4 II=D4 III=Eb4 IV=F4 V=G4 VI=Ab4 VII=Bb5 VIII=C5>

>>> c_minor[0].pitch()
523.251130601197

>>> c_minor["I"].pitch(symbolic=True)
440*2**(1/4)

>>> c_minor["tonic"].pitch(temperament='pythagorean', symbolic=True)
14080/27

Audibly play a note (or chord)

>>> from pytheory import play
play(c_minor[0], t=1_000)

Chord Fingerings for Custom Tunings

>>> from pytheory import Tone, Fretboard, CHARTS

>>> tones = (
...     Tone.from_string("F2"),
...     Tone.from_string("C3"),
...     Tone.from_string("G3"),
...     Tone.from_string("D4"),
...     Tone.from_string("A5"),
...     Tone.from_string("E5")
... )

>>> fretboard = Fretboard(tones=tones)
>>>
>>> c_chord = CHARTS['western']["C"]

>>> print(c_chord.fingering(fretboard=fretboard))
(0, 0, 0, 3, 3, 3)

It can also generate charts for all known chords for any instrument (accuracy to be determined!).

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