Added additional comments, removed redundant initializer code.

toyrobot/robot.py

@@ -1,7 +1,11 @@
 class Robot:
     """
     Class representing a single "Toy Robot".  Robots instances have knowledge
-    of their position, direction, and movement limits.
+    of their position, direction, and movement limits (i.e. "board" size).
+
+    Note: Direction is specified via compass points (north, west, etc).  As per
+    the original problem description, the coordinates (0, 0) represent the 
+    SOUTHWEST corner of the board.
 
     Attributes:
         DEFAULT_MAX_X (int): The default maximum allowable horizontal
@@ -11,6 +15,9 @@ class Robot:
         DIRECTIONS (dict): A dictionary (str: int) of direction names (e.g.
             NORTH, EAST etc) and their numerical encoding.  Only the keys are
             intended for use externally as a list of valid directions.
+        VALID_COMMANDS (list): A list of valid commands that can be interpreted
+            by the robot.  The PLACE command requires at least two additional
+            parameters.  See the complete problem description for more details.
     """
 
     DEFAULT_MAX_X = 5
@@ -328,5 +335,5 @@ class Robot:
         return "{},{},{}".format(
             self._position_x,
             self._position_y,
-            {v: k for k, v in Robot.DIRECTIONS.items()}[self._direction],
+            self.get_direction()
         )

trexamples.py

@@ -11,19 +11,19 @@ def feed_file(filename: str, robot: toyrobot.Robot):
 
 def main():
     print('a)')
-    feed_file('example_a.txt', toyrobot.Robot(6, 6))
+    feed_file('example_a.txt', toyrobot.Robot())
     print()
 
     print('b)')
-    feed_file('example_b.txt', toyrobot.Robot(6, 6))
+    feed_file('example_b.txt', toyrobot.Robot())
     print()
 
     print('c)')
-    feed_file('example_c.txt', toyrobot.Robot(6, 6))
+    feed_file('example_c.txt', toyrobot.Robot())
     print()
 
     print('d)')
-    feed_file('example_d.txt', toyrobot.Robot(6, 6))
+    feed_file('example_d.txt', toyrobot.Robot())
     print()
 
 if __name__ == "__main__":