Fretboard objects in Python

fretboard_and_notes.py

class Note:
        """
        Abstract representation of a musical note.
        
        Parameters
        ----------
        note : `str`, `int`, `Note`
            String representing note (e.g. 'C3', 'Ab', 'F#', etc.) or another `Note` object.
            
        Notes
        -----
        A note-like object is defined as any object than can be converted to a `Note` object.
        """
        def __init__(note):
            if isinstance(note, str):
                self._note = _note_string_to_int(note)
            elif isinstance(note, int):
                self._note = note
            else:
                self._note = note._note

class Fretboard:
    """
    Abstract representation of a fretboard of a stringed instrument.

    Parameters
    ----------
    tuning : sequence of note-like objects, optional
        Note representation for open strings.
    
    Examples
    --------
    >>> guitar = Fretboard()
    >>> print(guitar)
    E' |-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
    B  |-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|--/--|-----|-----|-----|
    G  |-----|-----|--/--|-----|--/--|-----|--/--|-----|--/--|-----|-----|-----|-----|-----|--/--|
    D  |-----|-----|--/--|-----|--/--|-----|--/--|-----|--/--|-----|-----|-----|-----|-----|--/--|
    A  |-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|--/--|-----|-----|-----|
    E  |-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
    >>> print(guitar.to_string(kind="chord"))
        E   A   D   G   B   E' 
        |   |   |   |   |   |
        |   |   |   |   |   |
        |   |   \   \   |   |
        |   |   |   |   |   |
        |   |   \   \   |   |
    >>> for chord_position in guitar.find_chord(('B2', 'C', 'E', 'B')):
    ...     guitar.fret(chord_position)
    ...     print(guitar.to_string(kind="chord"))
    ...     guitar.clear()
     5  |   |   X   X   X   |
        |   |   |   |   |   |
        |   |   \   \   |   X
        |   |   |   |   |   |
        |   |   \   \   |   |
    """
    def __init__(tuning=('E2', 'A2', 'D3', 'G3', 'B3', 'E3')):
        self._tuning = (Note(t) for t in tuning)