Created the main game loop and started writing the game's states.

state.py

@@ -0,0 +1,19 @@
+# Miguel Angel Astor Romero. Created on 7-1-2012. #
+###################################################
+
+# Valid game states.
+VALID_STATES = { 'INTRO':0, 'MENU':1, 'IN_GAME':2, 'SCORE':3, 'STAY':4, 'QUIT':89}
+
+# Parent class for game states.
+class BaseState:
+    def input(self):
+        """ Empty. Should handle PyGame input. """
+        pass
+
+    def update(self):
+        """ Empty. Should update the state. Returns a state to transition to. """
+        return VALID_STATES['STAY']
+
+    def render(self, canvas):
+        """ Empty. Should render this state on the canvas. """
+        pass