matplotlib
diff --git a/‎lib/matplotlib/axes/_base.py‎
Lines changed: 2 additions & 1 deletion b/‎lib/matplotlib/axes/_base.py‎
Lines changed: 2 additions & 1 deletion
diff --git a/‎lib/matplotlib/backend_tools.py‎
Lines changed: 1 addition & 1 deletion b/‎lib/matplotlib/backend_tools.py‎
Lines changed: 1 addition & 1 deletion
diff --git a/‎lib/matplotlib/figure.py‎
Lines changed: 12 additions & 17 deletions b/‎lib/matplotlib/figure.py‎
Lines changed: 12 additions & 17 deletions
@@ -414,7 +414,8 @@ class _AxesBase(martist.Artist):
     _shared_y_axes = cbook.Grouper()
 
     def __str__(self):
-        return "Axes(%g,%g;%gx%g)" % tuple(self._position.bounds)
+        return "{0}({1[0]:g},{1[1]:g};{1[2]:g}x{1[3]:g})".format(
+            type(self).__name__, self._position.bounds)
 
     def __init__(self, fig, rect,
                  facecolor=None,  # defaults to rc axes.facecolor
 
@@ -732,7 +732,7 @@ class ToolHome(ViewsPositionsBase):
 class ToolBack(ViewsPositionsBase):
     """Move back up the view lim stack"""
 
-    description = 'Back to  previous view'
+    description = 'Back to previous view'
     image = 'back.png'
     default_keymap = rcParams['keymap.back']
     _on_trigger = 'back'
 
@@ -958,7 +958,7 @@ def add_axes(self, *args, **kwargs):
             # check that an axes of this type doesn't already exist, if it
             # does, set it as active and return it
             ax = self._axstack.get(key)
-            if ax is not None and isinstance(ax, projection_class):
+            if isinstance(ax, projection_class):
                 self.sca(ax)
                 return ax
 
@@ -1860,12 +1860,10 @@ def subplots_adjust(self, *args, **kwargs):
         for ax in self.axes:
             if not isinstance(ax, SubplotBase):
                 # Check if sharing a subplots axis
-                if (ax._sharex is not None and
-                    isinstance(ax._sharex, SubplotBase)):
+                if isinstance(ax._sharex, SubplotBase):
                     ax._sharex.update_params()
                     ax.set_position(ax._sharex.figbox)
-                elif (ax._sharey is not None and
-                      isinstance(ax._sharey, SubplotBase)):
+                elif isinstance(ax._sharey, SubplotBase):
                     ax._sharey.update_params()
                     ax.set_position(ax._sharey.figbox)
             else:
@@ -1972,8 +1970,8 @@ def get_tightbbox(self, renderer):
 
         return bbox_inches
 
-    def tight_layout(self, renderer=None, pad=1.08, h_pad=None,
-                     w_pad=None, rect=None):
+    def tight_layout(self, renderer=None, pad=1.08, h_pad=None, w_pad=None,
+                     rect=None):
         """
         Adjust subplot parameters to give specified padding.
 
@@ -1991,23 +1989,20 @@ def tight_layout(self, renderer=None, pad=1.08, h_pad=None,
             labels) will fit into. Default is (0, 0, 1, 1).
         """
 
-        from .tight_layout import (get_renderer, get_tight_layout_figure,
-                                   get_subplotspec_list)
+        from .tight_layout import (
+            get_renderer, get_subplotspec_list, get_tight_layout_figure)
 
         subplotspec_list = get_subplotspec_list(self.axes)
         if None in subplotspec_list:
-            warnings.warn("This figure includes Axes that are not "
-                          "compatible with tight_layout, so its "
-                          "results might be incorrect.")
+            warnings.warn("This figure includes Axes that are not compatible "
+                          "with tight_layout, so results might be incorrect.")
 
         if renderer is None:
             renderer = get_renderer(self)
 
-        kwargs = get_tight_layout_figure(self, self.axes, subplotspec_list,
-                                         renderer,
-                                         pad=pad, h_pad=h_pad, w_pad=w_pad,
-                                         rect=rect)
-
+        kwargs = get_tight_layout_figure(
+            self, self.axes, subplotspec_list, renderer,
+            pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)
         self.subplots_adjust(**kwargs)