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transpose_chords.py
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#updated, more efficient code that handles all flats and sharps correctly
import pandas as pd
table = {
'capo':[2],
'Chords':['G-D-A-Bm-C#sus2-Eb-Ab-Ab7-Bbm']
}
df = pd.DataFrame(data=table)
natural_chords = ['A', 'A#', 'B', 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#']
chord_index = {chord: i for i, chord in enumerate(natural_chords)}
custom_transpositions = {
('F', 5): 'A#',
('F#', 5): 'B',
('Fm', 5): 'A#m',
('Gb', 5): 'B',
('G', 5): 'C',
('G#', 5): 'C#',
('Ab', 5): 'Db',
('F#m', 5): 'Bm',
('Gbm', 5): 'Bm',
('Gm', 5): 'Cm',
('G#m', 5): 'C#m',
('Abm', 5): 'C#m',
('Fadd9', 5): 'A#add9',
('F#add9', 5): 'Badd9',
('Gbadd9', 5): 'Badd9',
('Gadd9', 5): 'Cadd9',
('G#add9', 5): 'C#add9',
('Abadd9', 5): 'Dbadd9',
('F7', 5): 'A#7',
('F#7', 5): 'B7',
('Gb7',5): 'B7',
('G7', 5): 'C7',
('G#7', 5): 'C#7',
('Ab7', 5): 'Db7',
('Fm7', 5): 'A#m7',
('F#m7', 5): 'Bm7',
('Gbm7', 5): 'Bm7',
('Gm7', 5): 'Cm7',
('G#m7', 5): 'C#m7',
('Abm7', 5): 'Dbm7',
('Fsus2', 5): 'A#sus2',
('F#sus2', 5): 'Bsus2',
('Gbsus2', 5): 'Bsus2',
('Gsus2', 5): 'Csus2',
('G#sus2', 5): 'C#sus2',
('Absus2', 5): 'Dbsus2',
('Fsus4', 5): 'A#sus4',
('F#sus4', 5): 'Bsus4',
('Gbsus4', 5): 'Bsus4',
('Gsus4', 5): 'Csus4',
('G#sus4', 5): 'C#sus4',
('Absus4', 5): 'Dbsus4',
('F9', 5): 'A#9',
('F#9', 5): 'B9',
('Gb9', 5): 'B9',
('G9', 5): 'C9',
('G#9', 5): 'C#9',
('Ab9', 5): 'Db9',
('F', 4): 'A',
('F#',4): 'A#',
('Fm',4): 'Am',
('Gb', 4): 'Bb',
('G', 4): 'B',
('G#', 4): 'C',
('Ab', 4): 'C',
('F#m', 4): 'A#m',
('Gbm', 4): 'Bbm',
('Gm', 4): 'Bm',
('G#m', 4): 'Cm',
('Abm', 4): 'Cm',
('Fadd9', 4): 'Aadd9',
('F#add9', 4): 'A#add9',
('Gbadd9', 4): 'Bbadd9',
('Gadd9', 4): 'Badd9',
('G#add9', 4): 'Cadd9',
('Abadd9', 4): 'Cadd9',
('F7', 4): 'A7',
('F#7', 4): 'A#7',
('Gb7',4): 'Bb7',
('G7', 4): 'B7',
('G#7', 4): 'C7',
('Ab7', 4): 'C7',
('Fm7', 4): 'Am7',
('F#m7',4): 'A#m7',
('Gbm7', 4): 'Bbm7',
('Gm7', 4): 'Bm7',
('G#m7', 4): 'Cm7',
('Abm7', 4): 'Cm7',
('Fsus2', 4): 'Asus2',
('F#sus2', 4): 'A#sus2',
('Gbsus2', 4): 'Bbsus2',
('Gsus2', 4): 'Bsus2',
('G#sus2', 4): 'Csus2',
('Absus2', 4): 'Csus2',
('Fsus4', 4): 'Asus4',
('F#sus4', 4): 'A#sus4',
('Gbsus4', 4): 'Bbsus4',
('Gsus4', 4): 'Bsus4',
('G#sus4', 4): 'Csus4',
('Absus4', 4): 'Csus4',
('F9', 4): 'A9',
('F#9', 4): 'A#9',
('Gb9', 4): 'Bb9',
('G9', 4): 'B9',
('G#9', 4): 'C9',
('Ab9', 4): 'C9',
('F', 3): 'Ab',
('F#',3): 'A',
('Fm',3): 'Abm',
('Gb', 3): 'A',
('G', 3): 'Bb',
('G#', 3): 'B',
('Ab', 3): 'B',
('F#m', 3): 'Am',
('Gbm', 3): 'Am',
('Gm', 3): 'Bbm',
('G#m', 3): 'Bm',
('Abm', 3): 'Bm',
('Fadd9', 3): 'Bbadd9',
('F#add9', 3): 'Aadd9',
('Gbadd9', 3): 'Aadd9',
('Gadd9', 3): 'Bbadd9',
('G#add9', 3): 'Badd9',
('Abadd9', 3): 'Badd9',
('F7', 3): 'Ab7',
('F#7', 3): 'A7',
('Gb7',3): 'A7',
('G7', 3): 'Bb7',
('G#7', 3): 'B7',
('Ab7', 3): 'B7',
('Fm7', 3): 'Bbm7',
('F#m7',3): 'Am7',
('Gbm7', 3): 'Am7',
('Gm7', 3): 'Bbm7',
('G#m7', 3): 'Bm7',
('Abm7', 3): 'Bm7',
('Fsus2', 3): 'Absus2',
('F#sus2', 3): 'Asus2',
('Gbsus2', 3): 'Asus2',
('Gsus2', 3): 'Bbsus2',
('G#sus2', 3): 'Bsus2',
('Absus2', 3): 'Bsus2',
('Fsus4', 3): 'Absus4',
('F#sus4', 3): 'Asus4',
('Gbsus4', 3): 'Asus4',
('Gsus4', 3): 'Bbsus4',
('G#sus4', 3): 'Bsus4',
('Absus4', 3): 'Bsus4',
('F9', 3): 'Ab9',
('F#9', 3): 'A9',
('Gb9', 3): 'A9',
('G9', 3): 'Bb9',
('G#9', 3): 'B9',
('Ab9', 3): 'B9',
('G', 2): 'A',
('G#', 2): 'A#',
('Ab', 2): 'Bb',
('Gm', 2): 'Am',
('G#m', 2): 'A#m',
('Abm', 2): 'Bbm',
('Gadd9', 2): 'Aadd9',
('G#add9', 2): 'A#add9',
('Abadd9', 2): 'Bbadd9',
('G7', 2): 'A7',
('G#7', 2): 'A#7',
('Ab7', 2): 'Bb7',
('Gm7', 2): 'Am7',
('G#m7', 2): 'A#m7',
('Abm7', 2): 'Bbm7',
('Gsus2', 2): 'Asus2',
('G#sus2', 2): 'A#sus2',
('Absus2', 2): 'Bbsus2',
('Gsus4', 2): 'Asus4',
('G#sus4', 2): 'A#sus4',
('Absus4', 2): 'Bbsus4',
('G9', 2): 'A9',
('G#9', 2): 'A#9',
('Ab9', 2): 'Bb9',
('G#', 1): 'A',
('Ab', 1): 'A',
('G#m', 1): 'Am',
('Abm', 1): 'Am',
('G#add9', 1): 'Aadd9',
('Abadd9', 1): 'Aadd9',
('G#7', 1): 'A7',
('Ab7', 1): 'A7',
('G#m7', 1): 'A7',
('Abm7', 1): 'A7',
('G#sus2', 1): 'Asus2',
('Absus2', 1): 'Asus2',
('G#sus4', 1): 'Asus4',
('Absus4', 1): 'Asus4',
('G#9', 1): 'A9',
('Ab9', 1): 'A9',
}
#separate the root note
def pull_root_and_type(chord):
for i in range(1, 4):
possible_root = chord[:i]
if possible_root in chord_index:
return possible_root, chord[i:]
return chord, ''
#the root will be transposed separately this treats all bs as sharps
def handle_flats(chords):
handled_flats = []
for chord in chords:
chord.replace('b', '#')
return handled_flats
def transpose_individual(chord, capo):
if chord in ['N.C', 'NONE', 'CHORUS', 'BRIDGE']: #this is from the full CSV file I will transpose later
return chord
if chord in custom_transpositions:
if capo in custom_transpositions[chord]:
return custom_transpositions[chord][capo]
root, type = pull_root_and_type(chord)
root_index = chord_index[root]
transposed_index = (root_index +capo) %len(natural_chords)
transposed_chord = natural_chords[transposed_index]
return transposed_chord + type
#this returns the original suffix to the root which sometimes includes b & #
#to avoid 'Eb' capo 2 returning as 'F#b' negate redundancies
def redundancies(chord):
return chord.replace('#b', '')
def transpose_chords(chords, capo):
handled_flats = handle_flats(chords)
transposed_chords = []
for chord in chords:
transposed_chords.append(redundancies(transpose_individual(chord, capo)))
return transposed_chords
columns_to_transpose = ['Chords']
for column in columns_to_transpose:
df[column + 'Transposed'] = df.apply(lambda row:'-'.join(transpose_chords(row[column].split('-'), row['capo'])), axis=1)
print(df)
#this returns
#capo Chords ChordsTransposed
# 2 G-D-A-Bm-C#sus2-Eb-Ab-Ab7-Bbm A-E-B-C#m-D#sus2-F-Bb-Bb7-Cm