matplotlib
diff --git a/‎lib/matplotlib/backends/_backend_tk.py
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-2Lines changed: 0 additions & 2 deletions b/‎lib/matplotlib/backends/_backend_tk.py
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diff --git a/‎lib/matplotlib/backends/backend_qt5.py
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-1Lines changed: 0 additions & 1 deletion b/‎lib/matplotlib/backends/backend_qt5.py
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diff --git a/‎lib/matplotlib/backends/backend_wx.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backends/backend_wx.py
-1Lines changed: 0 additions & 1 deletion b/‎lib/matplotlib/backends/backend_wx.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backends/backend_wx.py
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@@ -412,7 +412,6 @@ def __init__(self, canvas, num, window):
         self.window = window
         self.window.withdraw()
         self.set_window_title("Figure %d" % num)
-        self.canvas = canvas
         # If using toolmanager it has to be present when initializing the
         # toolbar
         self.toolmanager = self._get_toolmanager()
@@ -502,7 +501,6 @@ class NavigationToolbar2Tk(NavigationToolbar2, tk.Frame):
         ``pack_toolbar=False``.
     """
     def __init__(self, canvas, window, *, pack_toolbar=True):
-        self.canvas = canvas
         # Avoid using self.window (prefer self.canvas.get_tk_widget().master),
         # so that Tool implementations can reuse the methods.
         self.window = window
 
@@ -516,7 +516,6 @@ class FigureManagerQT(FigureManagerBase):
 
     def __init__(self, canvas, num):
         FigureManagerBase.__init__(self, canvas, num)
-        self.canvas = canvas
         self.window = MainWindow()
         self.window.closing.connect(canvas.close_event)
         self.window.closing.connect(self._widgetclosed)
 
@@ -1110,7 +1110,6 @@ class NavigationToolbar2Wx(NavigationToolbar2, wx.ToolBar):
     def __init__(self, canvas):
         wx.ToolBar.__init__(self, canvas.GetParent(), -1)
         NavigationToolbar2.__init__(self, canvas)
-        self.canvas = canvas
         self._idle = True
         self.prevZoomRect = None
         # for now, use alternate zoom-rectangle drawing on all