by reading the exception you see that you pass function pointer instead of a value "KeyError: (<bound method Position.getX of <__main__.Position object at 0x4699490>>, <bound method Position.getY of <__main__.Position object at 0x4699490>>)"
as if you just print pos.getX and not pos.getX(), you will see the exact output - <__main__.Position object at 0x4699490> .. Regards, Yaniv. ----- Original Message ----- > From: "Sydney Shall" <s.sh...@virginmedia.com> > To: "Dave Angel" <da...@davea.name> > Sent: Monday, April 8, 2013 5:49:50 PM > Subject: Re: [Tutor] How to extract a float from an instancemethod call > > > > On 08/04/2013 13:52, Dave Angel wrote: > > On 04/08/2013 08:40 AM, Sydney Shall wrote: > >> 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 > > > > You never show the code for Position.getX and Position.getY, but I'd > > expect they're methods that take no arguments. in that case, you need > > parens in order to call them. > > > > x = pos.getX() > > y = pos.getY() > > > >> return self.room[(x,y)] in self.room > >> > > > > a simple print of x and y could have revealed this as well. > > > > > Dear Dave, > Thanks for pointing out my mistake. I thought it would be some small > error on my part. > I had a print statement, but I could not correctly interpret the output. > It solves that problem. > > > > -- > Sydney Shall > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
