Pythagoras Chords v0.1.1

How to Use

from pythagoraschords import PythagorasChords

pc = PythagorasChords("A")

print(pc.get_number())
print(pc.get_tone())
print(pc.get_major_scale())
print(pc.get_major_triad_scale())
print(pc.get_diatonic_extended_chords())
print(pc.get_diatonic_extended_chord(0))
print(pc.get_diatonic_extended_degree(0,0))

Output:

0
A
['A', 'B', 'C♯', 'D', 'E', 'F♯', 'G♯']
[['A', 'C♯', 'E'], ['B', 'D', 'F♯'], ['C♯', 'E', 'G♯'], ['D', 'F♯', 'A'], ['E', 'G♯', 'B'], ['F♯', 'A', 'C♯'], ['G♯', 'B', 'D']]
[['A', 'C♯', 'E', 'G♯', 'B', 'D', 'F♯'], ['B', 'D', 'F♯', 'A', 'C♯', 'E', 'G♯'], ['C♯', 'E', 'G♯', 'B', 'D', 'F♯', 'A'], ['D', 'F♯', 'A', 'C♯', 'E', 'G♯', 'B'], ['E', 'G♯', 'B', 'D', 'F♯', 'A', 'C♯'], ['F♯', 'A', 'C♯', 'E', 'G♯', 'B', 'D'], ['G♯', 'B', 'D', 'F♯', 'A', 'C♯', 'E']]
['A', 'C♯', 'E', 'G♯', 'B', 'D', 'F♯']
A

A

Musical name: La
Semitone number: 0

A♯ / A# / AS / BB / B♭

Musical names:
La sharp (A♯)
Si flat (B♭)
Semitone number: 1

B

Musical name: Si
Semitone number: 2

C

Musical name: Do
Semitone number: 3

C♯ / C# / CS / DB / D♭

Musical names:
Do sharp (C♯)
Re flat (D♭)
Semitone number: 4

D

Musical name: Re
Semitone number: 5

D♯ / D# / DS / EB / E♭

Musical names:
Re sharp (D♯)
Mi flat (E♭)
Semitone number: 6

E

Musical name: Mi
Semitone number: 7

F

Musical name: Fa
Semitone number: 8

F♯ / F# / FS / GB / G♭

Musical names:
Fa sharp (F♯)
Sol flat (G♭)
Semitone number: 9

G

Musical name: Sol
Semitone number: 10

G♯ / G# / GS / AB / A♭

Musical names:
Sol sharp (G♯)
La flat (A♭)
Semitone number: 11

Note

• This algorithm is public domain under the CC0 license.
• The logic is entirely original and was not generated by AI, ensuring that it is not an indirect copy of third‑party work.
• I affirm that this algorithm is public, and anyone may use it for any purpose.

Thanks

• I dedicate this work to my family, my friends, and the churches where I learned musical logic in Brazil, São Paulo, Jardim Eliza Maria.
• I thank J.L. Donadeli for giving me several guitar tips.