[Tutor] How to extract a float from an instancemethod call

[Sydney Shall]

Hi,
I am  learning Python.

I use MAC OSX 10.6.8
Python 2.7.3

I have been given a project to write a program involving random walks.
I have drafted a program which has passed all the static tests, but on 
testing my program i get the following error message:


Traceback (most recent call last):
   File "/Users/Sydney/Documents/6.00x Files/Problem 
Sets/ProblemSet7/ps7 copy.py", line 303, in <module>
     testRobotMovement(StandardRobot, RectangularRoom)
   File "ps7_verify_movement.py", line 12, in testRobotMovement
   File "/Users/Sydney/Documents/6.00x Files/Problem 
Sets/ProblemSet7/ps7 copy.py", line 285, in updatePositionAndClean
     while self.room.isPositionInRoom(self.position) == False:
   File "/Users/Sydney/Documents/6.00x Files/Problem 
Sets/ProblemSet7/ps7 copy.py", line 163, in isPositionInRoom
     return self.room[(x,y)] in self.room
KeyError: (<bound method Position.getX of <__main__.Position object at 
0x4699490>>, <bound method Position.getY of <__main__.Position object at 
0x4699490>>)
 >>>

The program text referred to is the following, I give the whole module, 
which is part of a larger program.
  def isPositionInRoom(self, pos):
         """
         Return True if pos is inside the room.

         pos: a Position object.
         returns: True if pos is in the room, False otherwise.
         """
         x = pos.getX
         y = pos.getY
         return self.room[(x,y)] in self.room

The module that made the call is;
  def updatePositionAndClean(self):
         """
         Simulate the raise passage of a single time-step.

         Move the robot to a new position and mark the tile it is on as 
having
         been cleaned.
         """
         steps = 0
         self.position = self.room.getRandomPosition()
         print self.position

         self.x = self.position.getX
         self.y = self.position.getY
         print self.room

         self.room.cleanTileAtPosition((self.x, self.y))

         self.direction = self.getRobotDirection()

         print 'Initial direction in degrees is ' , self.direction

         self.position = self.position.getNewPosition(self.direction, 
self.speed)
         steps += 1
         while self.room.isPositionInRoom(self.position) == False:
             self.direction = Robot.getRobotDirection()
             self.position = Position.getNewPosition(self.direction, 
self.speed)
             steps += 1
         self.x = self.position.getX
         self.y = self.position.getY


         print 'Current position is x,y ', self.x, self.y
         print 'Current direction is ' , self.direction + 'Degrees.'

         self.room.cleanTileAtPosition((self.x, self.y))

         print self.room.isTileCleaned((self.x, self.y))

I do not understand how one extracts a number from an instance method 
that should return a number.
I need to convert this number a float to an int to avoid the key error.
But I do not know how to extract the float.

This conclusion I derive from this earlier error message;

Traceback (most recent call last):
   File "/Users/Sydney/Documents/6.00x Files/Problem 
Sets/ProblemSet7/ps7 copy.py", line 303, in <module>
     testRobotMovement(StandardRobot, RectangularRoom)
   File "ps7_verify_movement.py", line 12, in testRobotMovement
   File "/Users/Sydney/Documents/6.00x Files/Problem 
Sets/ProblemSet7/ps7 copy.py", line 285, in updatePositionAndClean
     while self.room.isPositionInRoom(self.position) == False:
   File "/Users/Sydney/Documents/6.00x Files/Problem 
Sets/ProblemSet7/ps7 copy.py", line 163, in isPositionInRoom
     return self.room[(int(x), int(y))] in self.room
TypeError: int() argument must be a string or a number, not 'instancemethod'
 >>> ================================ RESTART 
================================

I would be grateful for any guidance.






-- 
Sydney Shall