Abstract is_stochastic from Match and Moran

axelrod/match.py

@@ -7,6 +7,14 @@
 C, D = Actions.C, Actions.D
 
 
+def is_stochastic(players, noise):
+    """Determines if a match is stochastic -- true if there is noise or if any
+    of the players involved is stochastic."""
+    return (
+        self._noise or
+        any(p.classifier['stochastic'] for p in self.players)
+        )
+
 class Match(object):
 
     def __init__(self, players, turns, deterministic_cache=None, noise=0):
@@ -38,10 +46,7 @@ def _stochastic(self):
         A boolean to show whether a match between two players would be
         stochastic
         """
-        return (
-            self._noise or
-            any(p.classifier['stochastic'] for p in self.players)
-            )
+        return is_stochastic(self.players, self._noise)
 
     @property
     def _cache_update_required(self):