initial creation

py3interm/EXAMPLES/adding_instance_methods.py

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+#!/usr/bin/env python
+from types import MethodType
+
+class Dog(): # <1>
+    pass
+
+d1 = Dog()  # <2>
+
+def bark(self):  # <3>
+    print("Woof! woof!")
+
+setattr(Dog, "bark", bark)  # <4>
+
+d2 = Dog() # <5>
+
+d1.bark()  # <6>
+d2.bark()
+
+def wag(self): # <7>
+    print("Wagging...")
+
+setattr(d1, "wag", MethodType(wag, d1))  # <8>
+
+d1.wag()  # <9>
+try:
+    d2.wag()  # <10>
+except AttributeError as err:
+    print(err)