Move transform type checks and improve docs

ZachDaChampion · ZachDaChampion · commit e33828f1b580 · 2023-04-14T23:39:36.000-04:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -597,12 +597,9 @@ def invert(x):
         if not (location in ['top', 'bottom'] or isinstance(location, Real)):
             raise ValueError('secondary_xaxis location must be either '
                              'a float or "top"/"bottom"')
-        if not (isinstance(transform, mtransforms.Transform) or transform is None):
-            raise ValueError('transform must be either an mtransforms.Transform '
-                             'or None')
 
         secondary_ax = SecondaryAxis(self, 'x', location, functions,
-                                        transform, **kwargs)
+                                     transform, **kwargs)
         self.add_child_axes(secondary_ax)
         return secondary_ax
 
@@ -649,11 +646,9 @@ def secondary_yaxis(self, location, *, functions=None, transform=None, **kwargs)
         if not (location in ['left', 'right'] or isinstance(location, Real)):
             raise ValueError('secondary_xaxis location must be either '
                              'a float or "left"/"right"')
-        if not (isinstance(transform, mtransforms.Transform) or transform is None):
-            raise ValueError('transform must be either an mtransforms.Transform '
-                             'or None')
+
         secondary_ax = SecondaryAxis(self, 'y', location, functions,
-                                        transform, **kwargs)
+                                     transform, **kwargs)
         self.add_child_axes(secondary_ax)
         return secondary_ax
 
diff --git a/lib/matplotlib/axes/_secondary_axes.py b/lib/matplotlib/axes/_secondary_axes.py
@@ -285,12 +285,6 @@ def set_color(self, color):
     parent axes to put the new axes, 0.0 being the bottom (or left)
     and 1.0 being the top (or right).
 
-transform : `.Transform`, optional
-    An optional transform that can be passed. *location* will be
-    placed relative to this transform (in the direction of the axis)
-    rather than the parent's axis. i.e. a secondary x-axis will
-    use the provided y transform and the x transform of the parent.
-
 functions : 2-tuple of func, or Transform with an inverse
 
     If a 2-tuple of functions, the user specifies the transform
