Minor pep8 correction of the docstring.

strategy.py

@@ -1,40 +1,43 @@
-"""http://stackoverflow.com/questions/963965/how-is-this-strategy-pattern-written-in-python-the-sample-in-wikipedia
-
-In most of other languages Strategy pattern is implemented via creating some base strategy interface/abstract class and
-subclassing it with a number of concrete strategies (as we can see at http://en.wikipedia.org/wiki/Strategy_pattern),
-however Python supports higher-order functions and allows us to have only one class and inject functions into it's
-instances, as shown in this example.
+# http://stackoverflow.com/questions/963965/how-is-this-strategy-pattern
+# -written-in-python-the-sample-in-wikipedia
+"""
+In most of other languages Strategy pattern is implemented via creating some
+base strategy interface/abstract class and subclassing it with a number of
+concrete strategies (as we can see at
+http://en.wikipedia.org/wiki/Strategy_pattern), however Python supports
+higher-order functions and allows us to have only one class and inject
+functions into it's instances, as shown in this example.
 """
 import types
 
 
 class StrategyExample:
     def __init__(self, func=None):
-        self.name = 'Strategy Example 0'         
+        self.name = 'Strategy Example 0'
         if func is not None:
-            self.execute = types.MethodType(func, self)      
+            self.execute = types.MethodType(func, self)
 
-    def execute(self):         
-        print(self.name)   
+    def execute(self):
+        print(self.name)
 
 
 def execute_replacement1(self):
-    print(self.name + ' from execute 1')   
+    print(self.name + ' from execute 1')
 
 
 def execute_replacement2(self):
-    print(self.name + ' from execute 2')  
+    print(self.name + ' from execute 2')
 
 
 if __name__ == '__main__':
-    strat0 = StrategyExample()     
+    strat0 = StrategyExample()
 
     strat1 = StrategyExample(execute_replacement1)
-    strat1.name = 'Strategy Example 1'     
+    strat1.name = 'Strategy Example 1'
 
     strat2 = StrategyExample(execute_replacement2)
     strat2.name = 'Strategy Example 2'
 
     strat0.execute()
-    strat1.execute()     
+    strat1.execute()
     strat2.execute()