typing.Self available

music21/base.py

@@ -548,7 +548,7 @@ def __init__(self,
         if quarterLength is not None:
             self.duration.quarterLength = quarterLength
 
-    def __eq__(self: _M21T, other) -> t.TypeGuard[_M21T]:
+    def __eq__(self, other) -> t.TypeGuard[t.Self]:
         '''
         Define equality for Music21Objects.  See main class docs.
         '''
@@ -612,10 +612,10 @@ def mergeAttributes(self, other: Music21Object) -> None:
             self.id = other.id
         self.groups = copy.deepcopy(other.groups)
 
-    def _deepcopySubclassable(self: _M21T,
+    def _deepcopySubclassable(self,
                               memo: dict[int, t.Any]|None = None,
                               *,
-                              ignoreAttributes: set[str]|None = None) -> _M21T:
+                              ignoreAttributes: set[str]|None = None) -> t.Self:
         '''
         Subclassable __deepcopy__ helper so that the same attributes
         do not need to be called for each Music21Object subclass.
@@ -657,7 +657,7 @@ def _deepcopySubclassable(self: _M21T,
 
         return new
 
-    def __deepcopy__(self: _M21T, memo: dict[int, t.Any]|None = None) -> _M21T:
+    def __deepcopy__(self, memo: dict[int, t.Any]|None = None) -> t.Self:
         '''
         Helper method to copy.py's deepcopy function.  Call it from there.
 

music21/chord/__init__.py

@@ -53,9 +53,6 @@
 
 environLocal = environment.Environment('chord')
 
-_ChordBaseType = t.TypeVar('_ChordBaseType', bound='music21.chord.ChordBase')
-_ChordType = t.TypeVar('_ChordType', bound='music21.chord.Chord')
-
 # ------------------------------------------------------------------------------
 class ChordException(exceptions21.Music21Exception):
     pass
@@ -162,7 +159,7 @@ def __eq__(self, other):
     def __hash__(self):
         return super().__hash__()
 
-    def __deepcopy__(self: _ChordBaseType, memo=None) -> _ChordBaseType:
+    def __deepcopy__(self, memo=None) -> t.Self:
         '''
         As Chord objects have one or more Volume, objects, and Volume
         objects store weak refs to the client object, need to specialize
@@ -1014,11 +1011,11 @@ def _findBass(self) -> pitch.Pitch|None:
         return lowest
 
     def _removePitchByRedundantAttribute(
-        self: _ChordType,
+        self,
         attribute: str,
         *,
         inPlace=False
-    ) -> _ChordType|list[pitch.Pitch]:
+    ) -> t.Self|list[pitch.Pitch]:
         '''
         Common method for stripping pitches based on redundancy of one pitch
         attribute. The `attribute` is provided by a string.
@@ -1113,7 +1110,7 @@ def add(
 
     @overload
     def annotateIntervals(
-        self: _ChordType,
+        self,
         *,
         inPlace: bool = False,
         stripSpecifiers: bool = True,
@@ -1124,7 +1121,7 @@ def annotateIntervals(
 
     @overload
     def annotateIntervals(
-        self: _ChordType,
+        self,
         *,
         inPlace: t.Literal[True],
         stripSpecifiers: bool = True,
@@ -1135,23 +1132,23 @@ def annotateIntervals(
 
     @overload
     def annotateIntervals(
-        self: _ChordType,
+        self,
         *,
         inPlace: t.Literal[False] = False,
         stripSpecifiers: bool = True,
         sortPitches: bool = True,
         returnList: t.Literal[False] = False
-    ) -> _ChordType:
+    ) -> t.Self:
         ...
 
     def annotateIntervals(
-        self: _ChordType,
+        self,
         *,
         inPlace: bool = False,
         stripSpecifiers: bool = True,
         sortPitches: bool = True,
         returnList: bool = False
-    ) -> _ChordType|None|list[str]:
+    ) -> t.Self|None|list[str]:
         # noinspection PyShadowingNames
         '''
         Add lyrics to the chord that show the distance of each note from
@@ -1251,7 +1248,7 @@ def annotateIntervals(
         if not inPlace:
             return c
 
-    def areZRelations(self: _ChordType, other: _ChordType) -> bool:
+    def areZRelations(self, other: t.Self) -> bool:
         '''
         Check if another Chord is a z-relation to this Chord.
 
@@ -1489,7 +1486,7 @@ def canBeTonic(self) -> bool:
 
     @overload
     def closedPosition(
-        self: _ChordType,
+        self,
         *,
         forceOctave: int|None = None,
         inPlace: t.Literal[True],
@@ -1499,21 +1496,21 @@ def closedPosition(
 
     @overload
     def closedPosition(
-        self: _ChordType,
+        self,
         *,
         forceOctave: int|None = None,
         inPlace: t.Literal[False] = False,
         leaveRedundantPitches: bool = False
-    ) -> _ChordType:
+    ) -> t.Self:
         ...
 
     def closedPosition(
-        self: _ChordType,
+        self,
         *,
         forceOctave: int|None = None,
         inPlace: bool = False,
         leaveRedundantPitches: bool = False
-    ) -> _ChordType|None:
+    ) -> t.Self|None:
         '''
         Returns a new Chord object with the same pitch classes,
         but now in closed position.
@@ -4015,7 +4012,7 @@ def root(self,
 
     @overload
     def semiClosedPosition(
-        self: _ChordType,
+        self,
         *,
         forceOctave,
         inPlace: t.Literal[True],
@@ -4025,21 +4022,21 @@ def semiClosedPosition(
 
     @overload
     def semiClosedPosition(
-        self: _ChordType,
+        self,
         *,
         forceOctave=None,
         inPlace: t.Literal[False] = False,
         leaveRedundantPitches=False
-    ) -> _ChordType:
+    ) -> t.Self:
         return self
 
     def semiClosedPosition(
-        self: _ChordType,
+        self,
         *,
         forceOctave: int|None = None,
         inPlace: t.Literal[True]|t.Literal[False] = False,
         leaveRedundantPitches: bool = False
-    ) -> None|_ChordType:
+    ) -> None|t.Self:
         # noinspection PyShadowingNames
         '''
         Similar to :meth:`~music21.chord.Chord.ClosedPosition` in that it

music21/harmony.py

@@ -38,9 +38,6 @@
 
 environLocal = environment.Environment('harmony')
 
-T = t.TypeVar('T', bound='ChordSymbol')
-NCT = t.TypeVar('NCT', bound='NoChord')
-
 if t.TYPE_CHECKING:
     from music21.figuredBass import realizerScale
 
@@ -2394,7 +2391,7 @@ def inversionIsValid(self, inversion):
         else:
             return False
 
-    def transpose(self: T, value, *, inPlace=False) -> T|None:
+    def transpose(self, value, *, inPlace=False) -> t.Self|None:
         '''
         Overrides :meth:`~music21.chord.Chord.transpose` so that this ChordSymbol's
         `figure` is appropriately cleared afterward.
@@ -2506,7 +2503,7 @@ def _parseFigure(self):
         # do nothing, everything is already set.
         return
 
-    def transpose(self: NCT, _value, *, inPlace=False) -> NCT|None:
+    def transpose(self, _value, *, inPlace=False) -> t.Self|None:
         '''
         Overrides :meth:`~music21.chord.Chord.transpose` to do nothing.
 

music21/key.py

@@ -39,8 +39,6 @@
 
 environLocal = environment.Environment('key')
 
-KeySignatureType = t.TypeVar('KeySignatureType', bound='KeySignature')
-KeyType = t.TypeVar('KeyType', bound='Key')
 TransposeTypes = int|str|interval.Interval|interval.GenericInterval
 
 
@@ -661,23 +659,23 @@ def accidentalByStep(self, step: StepName) -> pitch.Accidental|None:
     # --------------------------------------------------------------------------
     # methods
     @overload
-    def transpose(self: KeySignatureType,
+    def transpose(self,
                   value: TransposeTypes,
                   *,
-                  inPlace: t.Literal[False] = False) -> KeySignatureType:
+                  inPlace: t.Literal[False] = False) -> t.Self:
         ...
 
     @overload
-    def transpose(self: KeySignatureType,
+    def transpose(self,
                   value: TransposeTypes,
                   *,
                   inPlace: t.Literal[True]) -> None:
         ...
 
-    def transpose(self: KeySignatureType,
+    def transpose(self,
                   value: TransposeTypes,
                   *,
-                  inPlace: bool = False) -> KeySignatureType|None:
+                  inPlace: bool = False) -> t.Self|None:
         '''
         Transpose the KeySignature by the user-provided value.
         If the value is an integer, the transposition is treated
@@ -1232,26 +1230,26 @@ def tonalCertainty(self, method='correlationCoefficient') -> float:
             raise ValueError(f'Unknown method: {method}')
 
     @overload
-    def transpose(self: KeyType,
+    def transpose(self,
                   value: TransposeTypes,
                   *,
                   inPlace: t.Literal[False] = False
-                  ) -> KeyType:
+                  ) -> t.Self:
         ...
 
     @overload
-    def transpose(self: KeyType,
+    def transpose(self,
                   value: TransposeTypes,
                   *,
                   inPlace: t.Literal[True]
                   ) -> None:
         ...
 
-    def transpose(self: KeyType,
+    def transpose(self,
                   value: TransposeTypes,
                   *,
                   inPlace: bool = False
-                  ) -> KeyType|None:
+                  ) -> t.Self|None:
         '''
         Transpose the Key by the user-provided value.
         If the value is an integer, the transposition is treated

music21/note.py

@@ -43,9 +43,6 @@
     from music21 import chord
     from music21 import instrument
     from music21 import percussion
-    from music21.style import Style
-
-    _NotRestType = t.TypeVar('_NotRestType', bound='NotRest')
 
 environLocal = environment.Environment('note')
 
@@ -666,7 +663,7 @@ def __hash__(self):
 
     # --------------------------------------------------------------------------
     @property
-    def tie(self) -> tie.Tie|None:
+    def tie(self) -> 'tie.Tie|None':
         '''
         Return and set a :class:`~music21.note.Tie` object, or None.
 
@@ -678,7 +675,7 @@ def tie(self) -> tie.Tie|None:
         return self._tie
 
     @tie.setter
-    def tie(self, value: tie.Tie|None):
+    def tie(self, value: 'tie.Tie|None'):
         self._tie = value
 
     @property
@@ -1046,13 +1043,13 @@ def __init__(self,
     # Special functions
     # ==============================================================================================
 
-    def _deepcopySubclassable(self: _NotRestType,
+    def _deepcopySubclassable(self,
                               memo: dict[int, t.Any]|None = None,
                               *,
-                              ignoreAttributes: set[str]|None = None) -> _NotRestType:
+                              ignoreAttributes: set[str]|None = None) -> t.Self:
         new = super()._deepcopySubclassable(memo, ignoreAttributes={'_chordAttached'})
         if t.TYPE_CHECKING:
-            new = t.cast(_NotRestType, new)
+            new = t.cast(t.Self, new)
         # let the chord restore _chordAttached
 
         # after copying, if a Volume exists, it is linked to the old object
@@ -1292,7 +1289,7 @@ def _setVolume(self, value: None|volume.Volume|int|float, setClient=True):
             raise TypeError(f'this must be a Volume object, not {value}')
 
     @property
-    def volume(self) -> volume.Volume:
+    def volume(self) -> 'volume.Volume':
         '''
         Get and set the :class:`~music21.volume.Volume` object of this object.
         Volume objects are created on demand.
@@ -1309,7 +1306,7 @@ def volume(self) -> volume.Volume:
         return self._getVolume()
 
     @volume.setter
-    def volume(self, value: None|volume.Volume|int|float):
+    def volume(self, value: 'None|volume.Volume|int|float'):
         self._setVolume(value)
 
     @property
@@ -1606,7 +1603,7 @@ def __ge__(self, other):
         except AttributeError:
             return NotImplemented
 
-    def __deepcopy__(self: Note, memo=None) -> Note:
+    def __deepcopy__(self, memo=None) -> t.Self:
         '''
         After doing a deepcopy of the pitch, be sure to set the client
         '''