Pythagoras Chords v0.1.2

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

get_number()

    number
    0:A, 1:A#, 2:B, 3:C, 4:C#, 5:D, 6:D#, 7:E, 8:F, 9:F#, 10:G, 11:G#

get_tone(sharp_flat = False)

    sharp_flat
    false: notes_all_sharp (♯)
    true: notes_all_bemol (♭)

get_major_scale(sharp_flat = False)

    sharp_flat
    false: notes_all_sharp (♯)
    true: notes_all_bemol (♭)

get_major_triad_scale(triad = 0, sharp_flat = False)

    triad
    0:T, 1:2th, 2:3th, 3:4th, 4:5th, 5:6th, 6:7th

    sharp_flat
    false: notes_all_sharp (♯)
    true: notes_all_bemol (♭)

get_diatonic_extended_chords(sharp_flat = False)

    sharp_flat
    false: notes_all_sharp (♯)
    true: notes_all_bemol (♭)

get_diatonic_extended_chord(sub_scale = 0, sharp_flat = False)

    sub_scale
    0:T, 1:2th, 2:3th, 3:4th, 4:5th, 5:6th, 6:7th
    T   [0, 4, 7, 11, 2, 5, 9]
    2th [2, 5, 9, 0, 4, 7, 11]
    3th [4, 7, 11, 2, 5, 9, 0]
    4th [5, 9, 0, 4, 7, 11, 2]
    5th [7, 11, 2, 5, 9, 0, 4]
    6th [9, 0, 4, 7, 11, 2, 5]
    7th [11, 2, 5, 9, 0, 4, 7]

    sharp_flat
    false: notes_all_sharp (♯)
    true: notes_all_bemol (♭)

get_diatonic_extended_degree(sub_scale = 0, note = 0, sharp_flat = False)

    Returns a specific degree (note) of an extended diatonic chord within the diatonic scale generated for this key.

    sub_scale
    0:T, 1:2th, 2:3th, 3:4th, 4:5th, 5:6th, 6:7th
    T   [0, 4, 7, 11, 2, 5, 9]
    2th [2, 5, 9, 0, 4, 7, 11]
    3th [4, 7, 11, 2, 5, 9, 0]
    4th [5, 9, 0, 4, 7, 11, 2]
    5th [7, 11, 2, 5, 9, 0, 4]
    6th [9, 0, 4, 7, 11, 2, 5]
    7th [11, 2, 5, 9, 0, 4, 7]

    note
         0, 1, 2, 3, 4, 5, 6
    T   [0, 4, 7, 11, 2, 5, 9]
    2th [2, 5, 9, 0, 4, 7, 11]
    3th [4, 7, 11, 2, 5, 9, 0]
    4th [5, 9, 0, 4, 7, 11, 2]
    5th [7, 11, 2, 5, 9, 0, 4]
    6th [9, 0, 4, 7, 11, 2, 5]
    7th [11, 2, 5, 9, 0, 4, 7]

    sharp_flat
    false: notes_all_sharp (♯)
    true: notes_all_bemol (♭)

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.