matplotlib
diff --git a/‎doc/api/next_api_changes/removals/24356-OG.rst
Lines changed: 19 additions & 0 deletions b/‎doc/api/next_api_changes/removals/24356-OG.rst
Lines changed: 19 additions & 0 deletions
diff --git a/‎lib/matplotlib/collections.py
Lines changed: 8 additions & 35 deletions b/‎lib/matplotlib/collections.py
Lines changed: 8 additions & 35 deletions
diff --git a/‎lib/matplotlib/tests/test_collections.py
Lines changed: 4 additions & 75 deletions b/‎lib/matplotlib/tests/test_collections.py
Lines changed: 4 additions & 75 deletions
@@ -0,0 +1,19 @@
+``QuadMesh`` signature
+~~~~~~~~~~~~~~~~~~~~~~
+
+The `.QuadMesh` signature ::
+
+    def __init__(meshWidth, meshHeight, coordinates,
+                 antialiased=True, shading='flat', **kwargs)
+
+is removed and replaced by the new signature ::
+
+    def __init__(coordinates, *, antialiased=True, shading='flat', **kwargs)
+
+In particular:
+
+  the grid shape was separately specified as (*meshHeight* + 1, *meshWidth* +
+  1) and *coordinates* could be an array-like of any shape with M * N * 2
+  elements.
+- All parameters except *coordinates* are keyword-only now.
@@ -9,7 +9,6 @@
 line segments).
 """
 
-import inspect
 import math
 from numbers import Number
 import warnings
@@ -1952,33 +1951,13 @@ class QuadMesh(Collection):
     .. (0, meshWidth), (1, 0), (1, 1), and so on.
     """
 
-    def __init__(self, *args, **kwargs):
-        # signature deprecation since="3.5": Change to new signature after the
-        # deprecation has expired. Also remove setting __init__.__signature__,
-        # and remove the Notes from the docstring.
-        params = _api.select_matching_signature(
-            [
-                lambda meshWidth, meshHeight, coordinates, antialiased=True,
-                       shading='flat', **kwargs: locals(),
-                lambda coordinates, antialiased=True, shading='flat', **kwargs:
-                       locals()
-            ],
-            *args, **kwargs).values()
-        *old_w_h, coords, antialiased, shading, kwargs = params
-        if old_w_h:  # The old signature matched.
-            _api.warn_deprecated(
-                "3.5",
-                message="This usage of Quadmesh is deprecated: Parameters "
-                        "meshWidth and meshHeights will be removed; "
-                        "coordinates must be 2D; all parameters except "
-                        "coordinates will be keyword-only.")
-            w, h = old_w_h
-            coords = np.asarray(coords, np.float64).reshape((h + 1, w + 1, 2))
+    def __init__(self, coordinates, *, antialiased=True, shading='flat',
+                 **kwargs):
         kwargs.setdefault("pickradius", 0)
         # end of signature deprecation code
 
-        _api.check_shape((None, None, 2), coordinates=coords)
-        self._coordinates = coords
+        _api.check_shape((None, None, 2), coordinates=coordinates)
+        self._coordinates = coordinates
         self._antialiased = antialiased
         self._shading = shading
         self._bbox = transforms.Bbox.unit()
@@ -1988,11 +1967,6 @@ def __init__(self, *args, **kwargs):
         super().__init__(**kwargs)
         self.set_mouseover(False)
 
-    # Only needed during signature deprecation
-    __init__.__signature__ = inspect.signature(
-        lambda self, coordinates, *,
-               antialiased=True, shading='flat', pickradius=0, **kwargs: None)
-
     def get_paths(self):
         if self._paths is None:
             self.set_paths()
@@ -2036,11 +2010,10 @@ def set_array(self, A):
                     faulty_data = True
 
             if misshapen_data:
-                _api.warn_deprecated(
-                    "3.5", message=f"For X ({width}) and Y ({height}) "
-                    f"with {self._shading} shading, the expected shape of "
-                    f"A is ({h}, {w}). Passing A ({A.shape}) is deprecated "
-                    "since %(since)s and will become an error %(removal)s.")
+                raise ValueError(
+                    f"For X ({width}) and Y ({height}) with {self._shading} "
+                    f"shading, the expected shape of A is ({h}, {w}), not "
+                    f"{A.shape}")
 
             if faulty_data:
                 raise TypeError(
 
@@ -12,10 +12,8 @@
 import matplotlib.path as mpath
 import matplotlib.transforms as mtransforms
 from matplotlib.collections import (Collection, LineCollection,
-                                    EventCollection, PolyCollection,
-                                    QuadMesh)
+                                    EventCollection, PolyCollection)
 from matplotlib.testing.decorators import check_figures_equal, image_comparison
-from matplotlib._api.deprecation import MatplotlibDeprecationWarning
 
 
 def generate_EventCollection_plot():
@@ -811,77 +809,6 @@ def test_autolim_with_zeros(transform, expected):
     np.testing.assert_allclose(ax.get_xlim(), expected)
 
 
-@pytest.mark.parametrize('flat_ref, kwargs', [
-    (True, {}),
-    (False, {}),
-    (True, dict(antialiased=False)),
-    (False, dict(transform='__initialization_delayed__')),
-])
-@check_figures_equal(extensions=['png'])
-def test_quadmesh_deprecated_signature(
-        fig_test, fig_ref, flat_ref, kwargs):
-    # test that the new and old quadmesh signature produce the same results
-    # remove when the old QuadMesh.__init__ signature expires (v3.5+2)
-    x = [0, 1, 2, 3.]
-    y = [1, 2, 3.]
-    X, Y = np.meshgrid(x, y)
-    X += 0.2 * Y
-    coords = np.stack([X, Y], axis=-1)
-    assert coords.shape == (3, 4, 2)
-    C = np.linspace(0, 2, 6).reshape(2, 3)
-
-    ax = fig_test.add_subplot()
-    ax.set(xlim=(0, 5), ylim=(0, 4))
-    if 'transform' in kwargs:
-        kwargs['transform'] = mtransforms.Affine2D().scale(1.2) + ax.transData
-    qmesh = QuadMesh(coords, **kwargs)
-    qmesh.set_array(C)
-    ax.add_collection(qmesh)
-    assert qmesh._shading == 'flat'
-
-    ax = fig_ref.add_subplot()
-    ax.set(xlim=(0, 5), ylim=(0, 4))
-    if 'transform' in kwargs:
-        kwargs['transform'] = mtransforms.Affine2D().scale(1.2) + ax.transData
-    with pytest.warns(MatplotlibDeprecationWarning):
-        qmesh = QuadMesh(4 - 1, 3 - 1,
-                         coords.copy().reshape(-1, 2) if flat_ref else coords,
-                         **kwargs)
-    qmesh.set_array(C.flatten() if flat_ref else C)
-    ax.add_collection(qmesh)
-    assert qmesh._shading == 'flat'
-
-
-@check_figures_equal(extensions=['png'])
-def test_quadmesh_deprecated_positional(fig_test, fig_ref):
-    # test that positional parameters are still accepted with the old signature
-    # and work correctly
-    # remove when the old QuadMesh.__init__ signature expires (v3.5+2)
-    from matplotlib.collections import QuadMesh
-
-    x = [0, 1, 2, 3.]
-    y = [1, 2, 3.]
-    X, Y = np.meshgrid(x, y)
-    X += 0.2 * Y
-    coords = np.stack([X, Y], axis=-1)
-    assert coords.shape == (3, 4, 2)
-    C = np.linspace(0, 2, 12).reshape(3, 4)
-
-    ax = fig_test.add_subplot()
-    ax.set(xlim=(0, 5), ylim=(0, 4))
-    qmesh = QuadMesh(coords, antialiased=False, shading='gouraud')
-    qmesh.set_array(C)
-    ax.add_collection(qmesh)
-
-    ax = fig_ref.add_subplot()
-    ax.set(xlim=(0, 5), ylim=(0, 4))
-    with pytest.warns(MatplotlibDeprecationWarning):
-        qmesh = QuadMesh(4 - 1, 3 - 1, coords.copy().reshape(-1, 2),
-                         False, 'gouraud')
-    qmesh.set_array(C)
-    ax.add_collection(qmesh)
-
-
 def test_quadmesh_set_array_validation():
     x = np.arange(11)
     y = np.arange(8)
@@ -890,7 +817,9 @@ def test_quadmesh_set_array_validation():
     coll = ax.pcolormesh(x, y, z)
 
     # Test deprecated warning when faulty shape is passed.
-    with pytest.warns(MatplotlibDeprecationWarning):
+    with pytest.raises(ValueError, match=r"For X \(11\) and Y \(8\) with flat "
+                       r"shading, the expected shape of A is \(7, 10\), not "
+                       r"\(10, 7\)"):
         coll.set_array(z.reshape(10, 7))
 
     z = np.arange(54).reshape((6, 9))