def from_root_and_semitones(cls, root: Note, semitones: List[int]) -> "Chord":
chord = Intervals.from_semitones(semitones)
if "/" in chord.name:
chord_name, bass_degree = chord.name.split("/")
new_root = (
Note(root.name, 0).transpose(12 - degree_to_semitone(bass_degree)).name
)
name = f"{new_root}{chord_name}/{root.name}"
else:
name = root.name + chord.name
return cls(name, root, chord)
def from_root_and_semitones(cls, root: Note,
semitones: List[int]) -> "ChordWithRoot":
"""Creates a ChordWithRoot from a root `Note` and a list of semitones from the root.
`semitones_to_chord_name_options` is used to guess a good name for the chord.
"""
chord = Chord.from_semitones(None, semitones)
if "/" in chord.name:
chord_name, bass_degree = chord.name.split("/")
new_root = (Note(
root.name,
0).transpose(12 - degree_to_semitone(bass_degree)).name)
name = "{}{}/{}".format(new_root, chord_name, root.name)
else:
name = root.name + chord.name
return cls(name, root, chord)
def from_degrees(
cls, degrees: List[str], name: Optional[str] = None
) -> "Intervals":
return cls([degree_to_semitone(degree) for degree in degrees], name)
def test_degree_to_semitone_invalid_degree(degree):
with pytest.raises(InvalidDegree):
assert degree_to_semitone(degree)
def test_degree_to_semitone(degree, semitone):
assert degree_to_semitone(degree) == semitone
def from_degrees(cls, name: str, degrees: List[str]) -> "Chord":
"""Creates a Chord from a list of scale degrees.
If `name` is `None`, `semitones_to_chord_name_options` is used to guess a good name for the chord.
"""
return cls(name, [degree_to_semitone(degree) for degree in degrees])
