bpo-37685: Fixed __eq__, __lt__ etc implementations in some classes. (GH-14952)

They now return NotImplemented for unsupported type of the other operand.
diff --git a/Lib/tkinter/font.py b/Lib/tkinter/font.py
index eeff454..15ad7ab 100644
--- a/Lib/tkinter/font.py
+++ b/Lib/tkinter/font.py
@@ -101,7 +101,9 @@
         return self.name
 
     def __eq__(self, other):
-        return isinstance(other, Font) and self.name == other.name
+        if not isinstance(other, Font):
+            return NotImplemented
+        return self.name == other.name
 
     def __getitem__(self, key):
         return self.cget(key)