matplotlib
diff --git a/‎doc/api/next_api_changes/2018-04-22-ZHD.rst
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diff --git a/‎lib/matplotlib/axes/_base.py
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diff --git a/‎lib/mpl_toolkits/mplot3d/axes3d.py
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+4-16Lines changed: 4 additions & 16 deletions b/‎lib/mpl_toolkits/mplot3d/axes3d.py
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+4-16Lines changed: 4 additions & 16 deletions
@@ -1,6 +1,10 @@
 Different exception types for undocumented options
 --------------------------------------------------
 
+- Passing ``style='comma'`` to :meth:`~matplotlib.axes.Axes.ticklabel_format`
+  was never supported.  It now raises ``ValueError`` like all other
+  unsupported styles, rather than ``NotImplementedError``.
+
 - Passing the undocumented ``xmin`` or ``xmax`` arguments to
   :meth:`~matplotlib.axes.Axes.set_xlim` would silently override the ``left``
   and ``right`` arguments.  :meth:`~matplotlib.axes.Axes.set_ylim` and the
 
@@ -2756,8 +2756,6 @@ def ticklabel_format(self, *, axis='both', style='', scilimits=None,
             sb = True
         elif style == 'plain':
             sb = False
-        elif style == 'comma':
-            raise NotImplementedError("comma style remains to be added")
         elif style == '':
             sb = None
         else:
 
@@ -532,9 +532,7 @@ def autoscale_view(self, tight=None, scalex=True, scaley=True,
             _tight = self._tight = bool(tight)
 
         if scalex and self._autoscaleXon:
-            xshared = self._shared_x_axes.get_siblings(self)
-            dl = [ax.dataLim for ax in xshared]
-            bb = mtransforms.BboxBase.union(dl)
+            self._shared_x_axes.clean()
             x0, x1 = self.xy_dataLim.intervalx
             xlocator = self.xaxis.get_major_locator()
             try:
@@ -551,9 +549,7 @@ def autoscale_view(self, tight=None, scalex=True, scaley=True,
             self.set_xbound(x0, x1)
 
         if scaley and self._autoscaleYon:
-            yshared = self._shared_y_axes.get_siblings(self)
-            dl = [ax.dataLim for ax in yshared]
-            bb = mtransforms.BboxBase.union(dl)
+            self._shared_y_axes.clean()
             y0, y1 = self.xy_dataLim.intervaly
             ylocator = self.yaxis.get_major_locator()
             try:
@@ -570,9 +566,7 @@ def autoscale_view(self, tight=None, scalex=True, scaley=True,
             self.set_ybound(y0, y1)
 
         if scalez and self._autoscaleZon:
-            zshared = self._shared_z_axes.get_siblings(self)
-            dl = [ax.dataLim for ax in zshared]
-            bb = mtransforms.BboxBase.union(dl)
+            self._shared_z_axes.clean()
             z0, z1 = self.zz_dataLim.intervalx
             zlocator = self.zaxis.get_major_locator()
             try:
@@ -1366,13 +1360,8 @@ def ticklabel_format(
                 raise ValueError("scilimits must be a sequence of 2 integers")
         if style[:3] == 'sci':
             sb = True
-        elif style in ['plain', 'comma']:
+        elif style == 'plain':
             sb = False
-            if style == 'plain':
-                cb = False
-            else:
-                cb = True
-                raise NotImplementedError("comma style remains to be added")
         elif style == '':
             sb = None
         else:
@@ -1720,7 +1709,6 @@ def plot_surface(self, X, Y, Z, *args, norm=None, vmin=None,
                 # The construction leaves the array with duplicate points, which
                 # are removed here.
                 ps = list(zip(*ps))
-                lastp = np.array([])
                 ps2 = [ps[0]] + [ps[i] for i in range(1, len(ps)) if ps[i] != ps[i-1]]
                 avgzsum = sum(p[2] for p in ps2)
                 polys.append(ps2)