pyabc2.Note¶

class pyabc2.Note(value, duration=Fraction(1, 8))¶

A note has a pitch and a duration.

Parameters:

value (int) – Chromatic distance from C0 in semitones (half steps). For example, C4 (middle C) is 48, A4 is 57.
duration (Fraction) – The duration of the note, e.g. 1/8 (Fraction('1/8')) for an eighth note, which is the default.

Examples

>>> from pyabc2 import Note
>>> from fractions import Fraction
>>> Note(48)
Note(value=48, name='C4', duration=1/8)
>>> Note(48, Fraction('1/2'))
Note(value=48, name='C4', duration=1/2)

>>> Note.from_abc('C')
Note(value=48, name='C4', duration=1/8)
>>> Note.from_abc('C4')  # 4x unit duration
Note(value=48, name='C4', duration=1/2)

>>> Note.from_abc('D,3', octave_base=3)
Note(value=26, name='D2', duration=3/8)

>>> from pyabc2 import Pitch
>>> p = Pitch.from_name('E#3')
>>> Note.from_pitch(p)
Note(value=41, name='E#3', duration=1/8)
>>> Note(41)
Note(value=41, name='F3', duration=1/8)

__init__(value, duration=Fraction(1, 8))¶

Parameters:

value (int)
duration (Fraction)

Methods

`__init__`(value[, duration])
`from_abc`(abc, *[, key, octave_base, ...])	Parse ABC string to note.
`from_class_name`(args, *kwargs)	not implemented
`from_class_value`(args, *kwargs)	not implemented
`from_etf`(args, *kwargs)	not implemented
`from_helmholtz`(args, *kwargs)	not implemented
`from_name`(args, *kwargs)	not implemented
`from_pitch`(p, *[, duration])	From pitch instance.
`from_pitch_class`(args, *kwargs)	not implemented
`to_abc`(*[, key, octave_base, unit_duration])	Convert to ABC notation string.
`to_note`()	not implemented
`to_pitch`()	Convert to pitch, preserving the class name.
`to_pitch_class`()	Convert to pitch class, preserving the class name.
`unicode`()	not implemented

Attributes

`class_name`	Note name (pitch class).
`class_value`	Chromatic note value of the corresponding pitch class, relative to C.
`equal_temperament_frequency`	Piano key frequency.
`etf`	Alias for `equal_temperament_frequency`.
`helmholtz`	Pitch name in Helmholtz pitch notation, e.g. `C,` and `c'` (ASCII).
`n`	Alias for `piano_key_number`.
`name`	Note (pitch) name with octave, e.g., C4, Bb2.
`octave`	Octave number (e.g., A4/A440 is in octave 4).
`piano_key_number`	For example, middle C (C4) is 40.
`duration`	Note duration.
`value`	Pitch value (integer chromatic distance from C0 in semitones (half steps)).