matplotlib
diff --git a/‎doc/api/api_changes_3.3/deprecations.rst
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+5Lines changed: 5 additions & 0 deletions b/‎doc/api/api_changes_3.3/deprecations.rst
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diff --git a/‎lib/matplotlib/cm.py
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+24-15Lines changed: 24 additions & 15 deletions b/‎lib/matplotlib/cm.py
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+24-15Lines changed: 24 additions & 15 deletions
diff --git a/‎lib/matplotlib/collections.py
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+3-3Lines changed: 3 additions & 3 deletions b/‎lib/matplotlib/collections.py
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+3-3Lines changed: 3 additions & 3 deletions
@@ -450,3 +450,8 @@ needed.
 The associated helper methods ``NavigationToolbar2.draw()`` and
 ``ToolViewsPositions.refresh_locators()`` are deprecated, and should be
 replaced by calls to ``draw_idle()`` on the corresponding canvas.
+
+`.ScalarMappable` checkers
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+The ``add_checker`` and ``check_update`` methods and ``update_dict`` attribute
+of `.ScalarMappable` are deprecated.
@@ -177,7 +177,7 @@ def __init__(self, norm=None, cmap=None):
         #: The last colorbar associated with this ScalarMappable. May be None.
         self.colorbar = None
         self.callbacksSM = cbook.CallbackRegistry()
-        self.update_dict = {'array': False}
+        self._update_dict = {'array': False}
 
     def _scale_norm(self, norm, vmin, vmax):
         """
@@ -279,7 +279,7 @@ def set_array(self, A):
         A : ndarray
         """
         self._A = A
-        self.update_dict['array'] = True
+        self._update_dict['array'] = True
 
     def get_array(self):
         """Return the data array."""
@@ -386,30 +386,39 @@ def autoscale_None(self):
         self.norm.autoscale_None(self._A)
         self.changed()
 
-    def add_checker(self, checker):
+    def _add_checker(self, checker):
         """
         Add an entry to a dictionary of boolean flags
         that are set to True when the mappable is changed.
         """
-        self.update_dict[checker] = False
+        self._update_dict[checker] = False
 
-    def check_update(self, checker):
-        """
-        If mappable has changed since the last check,
-        return True; else return False
-        """
-        if self.update_dict[checker]:
-            self.update_dict[checker] = False
+    def _check_update(self, checker):
+        """Return whether mappable has changed since the last check."""
+        if self._update_dict[checker]:
+            self._update_dict[checker] = False
             return True
         return False
 
     def changed(self):
         """
         Call this whenever the mappable is changed to notify all the
-        callbackSM listeners to the 'changed' signal
+        callbackSM listeners to the 'changed' signal.
         """
         self.callbacksSM.process('changed', self)
-
-        for key in self.update_dict:
-            self.update_dict[key] = True
+        for key in self._update_dict:
+            self._update_dict[key] = True
         self.stale = True
+
+    @cbook.deprecated("3.3")
+    @property
+    def update_dict(self):
+        return self._update_dict
+
+    @cbook.deprecated("3.3")
+    def add_checker(self, checker):
+        return self._add_checker(checker)
+
+    @cbook.deprecated("3.3")
+    def check_update(self, checker):
+        return self.check_update(checker)
@@ -768,7 +768,7 @@ def set_edgecolor(self, c):
     def set_alpha(self, alpha):
         # docstring inherited
         super().set_alpha(alpha)
-        self.update_dict['array'] = True
+        self._update_dict['array'] = True
         self._set_facecolor(self._original_facecolor)
         self._set_edgecolor(self._original_edgecolor)
 
@@ -784,7 +784,7 @@ def update_scalarmappable(self):
             return
         if self._A.ndim > 1:
             raise ValueError('Collections can only map rank 1 arrays')
-        if not self.check_update("array"):
+        if not self._check_update("array"):
             return
         if self._is_filled:
             self._facecolors = self.to_rgba(self._A, self._alpha)
@@ -815,7 +815,7 @@ def update_from(self, other):
         self._A = other._A
         self.norm = other.norm
         self.cmap = other.cmap
-        # self.update_dict = other.update_dict # do we need to copy this? -JJL
+        # do we need to copy self._update_dict? -JJL
         self.stale = True