def get_chord_prog(bs, transpose=0):
"""コード進行取得、移調する（オプション）"""
cp = ChordProgression([
elem.text.replace('♭', 'b').replace('maj', 'M')
for elem in bs.select('span ruby rt')
if elem.text not in ('N.C', 'N.C.')
])
cp.transpose(transpose)
return ' '.join([str(c) for c in cp])
def chord_transpose(chords, step):
"""Function that tranposes the chords by specified step amount
Args:
chords (list): List of chords to transpose
step (int): The number of steps to transpose up (positive integer) or down (negative integer)
Returns:
list: tuple containing list of original chords and list of transposed chords
"""
original_chords = ChordProgression(chords)
transposed_chords = ChordProgression(chords)
transposed_chords.transpose(step)
return original_chords, transposed_chords
def test_transpose(self):
cp = ChordProgression(["C", "F", "G"])
cp.transpose(3)
self.assertEqual(cp.chords, [Chord("Eb"), Chord("Ab"), Chord("Bb")])
