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  1. names = list('CDEFGAB')
  2. solfege = ['Do', 'Re', 'Mi', 'Fa', 'So', 'La', 'Ti']
  3. offsets = {'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 'A': 9, 'B': 11}
  4. offsets.update({note + '#': off + 1 for note, off in offsets.items()})
  5. offsets.update({note + 'b': off - 1 for note, off in offsets.items() if len(note) == 1})
  6.  
  7.  
  8. def clean_name(note_name):
  9.     """Cancel out sharp/flat pairs, and change a double sharp to the standard x symbol."""
  10.     base = note_name[0]
  11.     offset = note_name.count('#') - note_name.count('b')
  12.     return base + ('' if offset == 0 else '#' if offset == 1 else 'x' if offset == 2 else 'b' * -offset)
  13.  
  14.  
  15. def note(scale, position):
  16.     base_name = scale[0]
  17.     suffix = scale[1:]
  18.     start = names.index(base_name)
  19.     # Wrap to start the scale in the right place
  20.     scale_names = [name + suffix for name in names[start:] + names[:start]]
  21.     offset = offsets[scale]
  22.     # expected offsets is just the standard 0,2,4,5,7,9,11
  23.     expected_offsets = sorted({v for k, v in offsets.items() if len(k) == 1})
  24.     # Find our current offsets, based on the note names
  25.     true_offsets = [(offsets[note] - offset) % 12 for note in scale_names]
  26.     # See how we need to add accidentals to get a proper major scale
  27.     adjustments = [expected - true for expected, true in zip(expected_offsets, true_offsets)]
  28.     scale_names = [clean_name(name + ('#' if adj == 1 else 'b' if adj == -1 else '')) for name, adj in
  29.                    zip(scale_names, adjustments)]
  30.     return scale_names[solfege.index(position)]
  31.  
  32.  
  33. if __name__ == '__main__':
  34.     print(note('C', 'Do'))  # C
  35.     print(note('C', 'Re'))  # D
  36.     print(note('C', 'Mi'))  # E
  37.     print(note('D', 'Mi'))  # F#
  38.     print(note('Bb', 'Fa'))  # Eb
  39.     print(note('A#', 'Fa'))  # D#
  40.     print(note('A#', 'Mi'))  # Cx (C##)
  41.     print(note('Fb', 'Fa'))  # Bbb
Success #stdin #stdout 0.04s 9280KB
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Standard input is empty
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C
D
E
F#
Eb
D#
Cx
Bbb
https://ideone.com/J3SgXS
language:
Python 3 (python  3.12)
created:
7 years ago
visibility:
public

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