implemented strategy pattern

pypatterns/behavioral/strategy.py

@@ -0,0 +1,17 @@
+from abc import ABCMeta, abstractmethod
+
+
+class Strategy(object):
+    """
+    An abstract Strategy class.
+    All strategies should inherit this class.
+    """
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def __call__(self, *args, **kwargs):
+        """
+        Abstract method that must be overridden.
+        The overridden method should execute the classes strategy.
+        """
+        pass