matplotlib · timhoffm · Jul 28, 2026 · Jul 27, 2026
diff --git a/lib/matplotlib/__init__.pyi b/lib/matplotlib/__init__.pyi
@@ -43,7 +43,6 @@ from matplotlib.typing import RcKeyType, RcGroupKeyType
 from typing import Any, Literal, NamedTuple, overload
 from matplotlib.typing import LogLevel
 
-
 class _VersionInfo(NamedTuple):
     major: int
     minor: int

diff --git a/lib/matplotlib/_docstring.pyi b/lib/matplotlib/_docstring.pyi
@@ -1,30 +1,24 @@
 from collections.abc import Callable
 from typing import Any, overload
 
-
 def kwarg_doc[T](text: str) -> Callable[[T], T]: ...
 
-
 class Substitution:
     @overload
     def __init__(self, *args: str): ...
     @overload
     def __init__(self, **kwargs: str): ...
     def __call__[T](self, func: T) -> T: ...
 
-
 class _ArtistKwdocLoader(dict[str, str]):
     def __missing__(self, key: str) -> str: ...
 
-
 class _ArtistPropertiesSubstitution:
     def __init__(self) -> None: ...
     def register(self, **kwargs) -> None: ...
     def __call__[T](self, obj: T) -> T: ...
 
-
 def copy[T](source: Any) -> Callable[[T], T]: ...
 
-
 dedent_interpd: _ArtistPropertiesSubstitution
 interpd: _ArtistPropertiesSubstitution
diff --git a/lib/matplotlib/_enums.pyi b/lib/matplotlib/_enums.pyi
@@ -1,14 +1,12 @@
 from enum import Enum
 
-
 class JoinStyle(str, Enum):
     miter = "miter"
     round = "round"
     bevel = "bevel"
     @staticmethod
     def demo() -> None: ...
 
-
 class CapStyle(str, Enum):
     butt = "butt"
     projecting = "projecting"

diff --git a/lib/matplotlib/artist.pyi b/lib/matplotlib/artist.pyi
@@ -187,7 +187,6 @@ class ArtistInspector:
     def properties(self) -> dict[str, Any]: ...
     def pprint_getters(self) -> list[str]: ...
 
-
 class ArtistList[T: Artist](Sequence[T]):
     def __init__(
         self,

diff --git a/lib/matplotlib/axes/__init__.pyi b/lib/matplotlib/axes/__init__.pyi
@@ -1,6 +1,5 @@
 from ._axes import Axes as Axes
 
-
 # Backcompat.
 Subplot = Axes
 

diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -3939,7 +3939,6 @@ def pie_label(self, container, /, labels, *, distance=0.6,
 
         return texts
 
-
     @staticmethod
     def _errorevery_to_mask(x, errorevery):
         """

diff --git a/lib/matplotlib/axes/_axes.pyi b/lib/matplotlib/axes/_axes.pyi
@@ -48,7 +48,6 @@ from matplotlib.typing import (
     ColorType, DataParamType, MarkerType, LegendLocType, LineStyleType)
 import pandas as pd
 
-
 class _GroupedBarReturn:
     bar_containers: list[BarContainer]
     def __init__(self, bar_containers: list[BarContainer]) -> None: ...
@@ -632,9 +631,9 @@ class Axes(_AxesBase):
         x: ArrayLike,
         weights: ArrayLike | None = ...,
         *,
-        complementary: bool=...,
-        orientation: Literal["vertical", "horizontal"]=...,
-        compress: bool=...,
+        complementary: bool = ...,
+        orientation: Literal["vertical", "horizontal"] = ...,
+        compress: bool = ...,
         data: DataParamType = ...,
         **kwargs
     ) -> Line2D: ...

diff --git a/lib/matplotlib/axis.pyi b/lib/matplotlib/axis.pyi
@@ -17,7 +17,6 @@ from matplotlib.transforms import Transform, Bbox
 from matplotlib.typing import ColorType
 from matplotlib.units import ConversionInterface
 
-
 GRIDLINE_INTERPOLATION_STEPS: int
 
 class Tick(martist.Artist):

diff --git a/lib/matplotlib/backends/backend_qt.py b/lib/matplotlib/backends/backend_qt.py
@@ -867,7 +867,6 @@ def _icon(self, name):
         engine = _IconEngine(path_regular, self)
         return QtGui.QIcon(engine)
 
-
     def edit_parameters(self):
         axes = self.canvas.figure.get_axes()
         if not axes:

diff --git a/lib/matplotlib/backends/registry.pyi b/lib/matplotlib/backends/registry.pyi
@@ -1,12 +1,10 @@
 from enum import Enum
 from types import ModuleType
 
-
 class BackendFilter(Enum):
     INTERACTIVE = 0
     NON_INTERACTIVE = 1
 
-
 class BackendRegistry:
     _BUILTIN_BACKEND_TO_GUI_FRAMEWORK: dict[str, str]
     _GUI_FRAMEWORK_TO_BACKEND: dict[str, str]
@@ -31,5 +29,4 @@ class BackendRegistry:
     def resolve_backend(self, backend: str | None) -> tuple[str, str | None]: ...
     def resolve_gui_or_backend(self, gui_or_backend: str | None) -> tuple[str, str | None]: ...
 
-
 backend_registry: BackendRegistry
diff --git a/lib/matplotlib/backends/web_backend/nbagg_uat.ipynb b/lib/matplotlib/backends/web_backend/nbagg_uat.ipynb
@@ -313,8 +313,8 @@
     "\n",
     "manager = new_figure_manager(1000)\n",
     "fig = manager.canvas.figure\n",
-    "ax = fig.add_subplot(1,1,1)\n",
-    "ax.plot([1,2,3])\n",
+    "ax = fig.add_subplot(1, 1, 1)\n",
+    "ax.plot([1, 2, 3])\n",
     "fig.show()"
    ]
   },
@@ -403,9 +403,9 @@
    "source": [
     "import itertools\n",
     "fig, ax = plt.subplots()\n",
-    "x = np.linspace(0,10,10000)\n",
+    "x = np.linspace(0, 10, 10000)\n",
     "y = np.sin(x)\n",
-    "ln, = ax.plot(x,y)\n",
+    "ln, = ax.plot(x, y)\n",
     "evt = []\n",
     "colors = iter(itertools.cycle(['r', 'g', 'b', 'k', 'c']))\n",
     "\n",

diff --git a/lib/matplotlib/cm.pyi b/lib/matplotlib/cm.pyi
@@ -2,7 +2,6 @@ from collections.abc import Iterator, Mapping
 from matplotlib import colors
 from matplotlib.colorizer import _ScalarMappable
 
-
 class ColormapRegistry(Mapping[str, colors.Colormap]):
     def __init__(self, cmaps: Mapping[str, colors.Colormap]) -> None: ...
     def __getitem__(self, item: str) -> colors.Colormap: ...

diff --git a/lib/matplotlib/collections.pyi b/lib/matplotlib/collections.pyi
@@ -167,7 +167,6 @@ class LineCollection(Collection):
     def get_colors(self) -> ColorType | Sequence[ColorType]: ...
     def get_gapcolor(self) -> ColorType | Sequence[ColorType] | None: ...
 
-
 class EventCollection(LineCollection):
     def __init__(
         self,

diff --git a/lib/matplotlib/colorbar.pyi b/lib/matplotlib/colorbar.pyi
@@ -13,14 +13,12 @@ from collections.abc import Sequence
 from typing import Any, Literal, overload
 from .typing import ColorType
 
-
 class _ColorbarSpine(mspines.Spine):
     def __init__(self, axes: Axes): ...
     def get_window_extent(self, renderer: RendererBase | None = ...) -> Bbox: ...
     def set_xy(self, xy: ArrayLike) -> None: ...
     def draw(self, renderer: RendererBase | None) -> None: ...
 
-
 class Colorbar:
     n_rasterize: int
     mappable: cm.ScalarMappable | colorizer.ColorizingArtist

diff --git a/lib/matplotlib/colorizer.pyi b/lib/matplotlib/colorizer.pyi
@@ -3,7 +3,6 @@ from matplotlib import cbook, colorbar, colors, artist
 import numpy as np
 from numpy.typing import ArrayLike
 
-
 class Colorizer:
     colorbar: colorbar.Colorbar | None
     callbacks: cbook.CallbackRegistry
@@ -45,7 +44,6 @@ class Colorizer:
     @clip.setter
     def clip(self, value: ArrayLike | bool | tuple[bool, ...]) -> None: ...
 
-
 class _ColorizerInterface:
     cmap: colors.Colormap | colors.BivarColormap | colors.MultivarColormap
     colorbar: colorbar.Colorbar | None
@@ -70,7 +68,6 @@ class _ColorizerInterface:
     def autoscale(self) -> None: ...
     def autoscale_None(self) -> None: ...
 
-
 class _ScalarMappable(_ColorizerInterface):
     def __init__(
         self,
@@ -84,7 +81,6 @@ class _ScalarMappable(_ColorizerInterface):
     def get_array(self) -> np.ndarray | None: ...
     def changed(self) -> None: ...
 
-
 class ColorizingArtist(_ScalarMappable, artist.Artist):
     callbacks: cbook.CallbackRegistry
     def __init__(

diff --git a/lib/matplotlib/colors.pyi b/lib/matplotlib/colors.pyi
@@ -274,7 +274,6 @@ class Norm(ABC):
     @property
     def n_components(self) -> int: ...
 
-
 class Normalize(Norm):
     def __init__(
         self, vmin: float | None = ..., vmax: float | None = ..., clip: bool = ...

diff --git a/lib/matplotlib/contour.pyi b/lib/matplotlib/contour.pyi
@@ -16,8 +16,6 @@ from collections.abc import Callable, Iterable, Sequence
 from typing import Literal
 from .typing import ColorType
 
-
-
 class ContourLabeler:
     labelFmt: str | Formatter | Callable[[float], str] | dict[float, str]
     labelManual: bool | Iterable[tuple[float, float]]

diff --git a/lib/matplotlib/dates.pyi b/lib/matplotlib/dates.pyi
@@ -7,26 +7,26 @@ import numpy.typing as npt
 
 TZ = str | datetime.tzinfo
 
-def _get_tzinfo(tz: TZ | None=None) -> datetime.tzinfo: ...
+def _get_tzinfo(tz: TZ | None = None) -> datetime.tzinfo: ...
 def _reset_epoch_test_example() -> None: ...
 def set_epoch(epoch: str) -> None: ...
 def get_epoch() -> str: ...
 def _dt64_to_ordinalf(d: npt.NDArray[np.datetime64]) -> npt.NDArray[np.floating]: ...
-def _from_ordinalf(x: float, tz: TZ | None=None) -> datetime.datetime: ...
+def _from_ordinalf(x: float, tz: TZ | None = None) -> datetime.datetime: ...
 # Ideally str | Sequence[str] would get an override, but because a str is a valid Sequence[str],
 # it's not possible to distinguish between them in the type system
 # See https://github.com/python/typing/issues/256
-def datestr2num(d: str | Sequence[str], default: datetime.datetime | None=None) -> float | npt.NDArray[np.floating]: ...
+def datestr2num(d: str | Sequence[str], default: datetime.datetime | None = None) -> float | npt.NDArray[np.floating]: ...
 
 @overload
 def date2num(d: datetime.datetime | np.datetime64) -> float: ...
 @overload
 def date2num(d: Sequence[datetime.datetime] | Sequence[np.datetime64]) -> npt.NDArray[np.floating]: ...
 
 @overload
-def num2date(x: float, tz: TZ | None=None) -> datetime.datetime: ...
+def num2date(x: float, tz: TZ | None = None) -> datetime.datetime: ...
 @overload
-def num2date(x: Sequence[float], tz: TZ | None=None) -> list[datetime.datetime]: ...
+def num2date(x: Sequence[float], tz: TZ | None = None) -> list[datetime.datetime]: ...
 
 @overload
 def num2timedelta(x: float) -> datetime.timedelta: ...

diff --git a/lib/matplotlib/dviread.pyi b/lib/matplotlib/dviread.pyi
@@ -10,7 +10,6 @@ from typing import Self
 
 from .ft2font import CharacterCodeType, GlyphIndexType
 
-
 class _dvistate(Enum):
     pre = ...
     outer = ...

diff --git a/lib/matplotlib/legend.pyi b/lib/matplotlib/legend.pyi
@@ -16,12 +16,10 @@ from matplotlib.transforms import (
 )
 from matplotlib.typing import ColorType, LegendLocType
 
-
 import pathlib
 from collections.abc import Iterable
 from typing import Any, Literal, overload
 
-
 class DraggableLegend(DraggableOffsetBox):
     legend: Legend
     def __init__(

diff --git a/lib/matplotlib/patches.pyi b/lib/matplotlib/patches.pyi
@@ -267,7 +267,6 @@ class Ellipse(Patch):
     def get_vertices(self) -> list[tuple[float, float]]: ...
     def get_co_vertices(self) -> list[tuple[float, float]]: ...
 
-
 class Annulus(Patch):
     a: float
     b: float

diff --git a/lib/matplotlib/quiver.pyi b/lib/matplotlib/quiver.pyi
@@ -5,7 +5,6 @@ from matplotlib.figure import Figure, SubFigure
 from matplotlib.text import Text
 from matplotlib.transforms import Transform, Bbox
 
-
 import numpy as np
 from numpy.typing import ArrayLike
 from collections.abc import Sequence

diff --git a/lib/matplotlib/rcsetup.pyi b/lib/matplotlib/rcsetup.pyi
@@ -4,7 +4,6 @@ from collections.abc import Callable, Iterable
 from typing import Any, Literal
 from matplotlib.typing import ColorType, LineStyleType, MarkEveryType
 
-
 def _listify_validator[T](
     scalar_validator: Callable[[Any], T],
     allow_stringlist: bool = ...,

diff --git a/lib/matplotlib/tests/test_cbook.py b/lib/matplotlib/tests/test_cbook.py
@@ -189,6 +189,7 @@ def dummy(self): pass
 
 class Unhashable:
     __hash__ = None  # type: ignore[assignment]
+
     def dummy(self): pass
 
 
@@ -660,12 +661,16 @@ def test_warn_external_collections_abc(recwarn):
     class UselessSequence(MutableSequence):
         def __len__(self):
             return 2
+
         def __getitem__(self, subscript):
             return 'foo'
+
         def __delitem__(self, index):
             pass
+
         def __setitem__(self, key, item):
             pass
+
         def insert(self, index, item):
             _api.warn_external("This won't do anything")
 
@@ -677,7 +682,6 @@ def insert(self, index, item):
     assert 'collection' not in recwarn[0].filename
 
 
-
 def test_warn_external_frame_embedded_python():
     with patch.object(cbook, "sys") as mock_sys:
         mock_sys._getframe = Mock(return_value=None)

diff --git a/lib/matplotlib/tests/test_colors.py b/lib/matplotlib/tests/test_colors.py
@@ -1893,15 +1893,15 @@ def scaled(self):
         def n_components(self):
             return 1
 
-    fig, axes = plt.subplots(2,2)
+    fig, axes = plt.subplots(2, 2)
 
-    r = np.linspace(-1, 3, 16*16).reshape((16,16))
+    r = np.linspace(-1, 3, 16*16).reshape((16, 16))
     norm = CustomHalfNorm()
     colorizer = mpl.colorizer.Colorizer(cmap='viridis', norm=norm)
-    c = axes[0,0].imshow(r, colorizer=colorizer)
-    axes[0,1].pcolor(r, colorizer=colorizer)
-    axes[1,0].contour(r, colorizer=colorizer)
-    axes[1,1].contourf(r, colorizer=colorizer)
+    c = axes[0, 0].imshow(r, colorizer=colorizer)
+    axes[0, 1].pcolor(r, colorizer=colorizer)
+    axes[1, 0].contour(r, colorizer=colorizer)
+    axes[1, 1].contourf(r, colorizer=colorizer)
 
 
 def test_close_error_name():
@@ -2012,7 +2012,7 @@ def test_mult_norm_call_types():
     mn.vmin = (-2, -2)
     mn.vmax = (2, 2)
 
-    vals = np.arange(6).reshape((3,2))
+    vals = np.arange(6).reshape((3, 2))
     target = np.ma.array([(0.5, 0.75),
                           (1., 1.25),
                           (1.5, 1.75)])

diff --git a/lib/matplotlib/tests/test_rcparams.py b/lib/matplotlib/tests/test_rcparams.py
@@ -673,7 +673,7 @@ def test_rcparams_path_sketch_from_file(tmp_path, value):
     ('font',   'sans-serif',     'sans', ["Verdana"])
 ])
 def test_rc_aliases(group, option, alias, value):
-    rc_kwargs = {alias: value,}
+    rc_kwargs = {alias: value}
     mpl.rc(group, **rc_kwargs)
 
     rcParams_key = f"{group}.{option}"

diff --git a/lib/matplotlib/transforms.pyi b/lib/matplotlib/transforms.pyi
@@ -366,7 +366,6 @@ def offset_copy(
     units: Literal["inches", "points", "dots"] = ...,
 ) -> Transform: ...
 
-
 class _ScaledRotation(Affine2DBase):
     def __init__(self, theta: float, trans_shift: Transform) -> None: ...
     def get_matrix(self) -> np.ndarray: ...
-Original file line number
+Diff line change
@@ Expand Up @@
             return texts
         @staticmethod
         def _errorevery_to_mask(x, errorevery):
             """
@@ Expand Down @@