Adds find_file method

tron/player.py

@@ -25,7 +25,21 @@ class Player(object):
     def __init__(self):
         pass
 
+    def find_file(self, name):
+        """
+        Returns the correct path for finding an asset file (like neural network
+        weights file) in the directory where the Ai class is.
+
+        :name the name of the file to look for
+        """
+        return self.__module__.replace('.', '/') + '/' + name
+
+
     def next_position_and_direction(self, current_position, id, map):
+        """
+        Computes the direction of the player, and computes its next position
+        depending on the current position.
+        """
         direction = self.action(map, id)
         if direction == Direction.UP:
             return ((current_position[0] - 1, current_position[1]), direction)