Use cbook._setattr_cm more.

Author: QuLogic

lib/matplotlib/legend_handler.py

@@ -28,6 +28,7 @@ def legend_artist(self, legend, orig_handle, fontsize, handlebox)
 
 import numpy as np
 
+from matplotlib import cbook
 from matplotlib.lines import Line2D
 from matplotlib.patches import Rectangle
 import matplotlib.collections as mcoll
@@ -607,19 +608,15 @@ def create_artists(self, legend, orig_handle,
         if using_linecoll:
             # change the function used by update_prop() from the default
             # to one that handles LineCollection
-            orig_update_func = self._update_prop_func
-            self._update_prop_func = self._copy_collection_props
-
-            for line in leg_stemlines:
-                self.update_prop(line, stemlines, legend)
+            with cbook._setattr_cm(
+                    self, _update_prop_func=self._copy_collection_props):
+                for line in leg_stemlines:
+                    self.update_prop(line, stemlines, legend)
 
         else:
             for lm, m in zip(leg_stemlines, stemlines):
                 self.update_prop(lm, m, legend)
 
-        if using_linecoll:
-            self._update_prop_func = orig_update_func
-
         leg_baseline = Line2D([np.min(xdata), np.max(xdata)],
                               [bottom, bottom])
         self.update_prop(leg_baseline, baseline, legend)

lib/matplotlib/quiver.py

@@ -306,18 +306,15 @@ def _init(self):
             if not self.Q._initialized:
                 self.Q._init()
             self._set_transform()
-            _pivot = self.Q.pivot
-            self.Q.pivot = self.pivot[self.labelpos]
-            # Hack: save and restore the Umask
-            _mask = self.Q.Umask
-            self.Q.Umask = ma.nomask
-            u = self.U * np.cos(np.radians(self.angle))
-            v = self.U * np.sin(np.radians(self.angle))
-            angle = self.Q.angles if isinstance(self.Q.angles, str) else 'uv'
-            self.verts = self.Q._make_verts(
-                np.array([u]), np.array([v]), angle)
-            self.Q.Umask = _mask
-            self.Q.pivot = _pivot
+            with cbook._setattr_cm(self.Q, pivot=self.pivot[self.labelpos],
+                                   # Hack: save and restore the Umask
+                                   Umask=ma.nomask):
+                u = self.U * np.cos(np.radians(self.angle))
+                v = self.U * np.sin(np.radians(self.angle))
+                angle = (self.Q.angles if isinstance(self.Q.angles, str)
+                         else 'uv')
+                self.verts = self.Q._make_verts(
+                    np.array([u]), np.array([v]), angle)
             kw = self.Q.polykw
             kw.update(self.kw)
             self.vector = mcollections.PolyCollection(

lib/matplotlib/widgets.py

@@ -1151,10 +1151,8 @@ def __init__(self, targetfig, toolfig):
 
         # During reset there can be a temporary invalid state depending on the
         # order of the reset so we turn off validation for the resetting
-        validate = toolfig.subplotpars.validate
-        toolfig.subplotpars.validate = False
-        self.buttonreset.on_clicked(self._on_reset)
-        toolfig.subplotpars.validate = validate
+        with cbook._setattr_cm(toolfig.subplotpars, validate=False):
+            self.buttonreset.on_clicked(self._on_reset)
 
     def _on_slider_changed(self, _):
         self.targetfig.subplots_adjust(