Matthew Studley wrote:
HI Doug,
our students tried the correct interface (using setBrightness(n)) but
got a similar error.
The problem seems to be as below:
AttributeError: BulbDevice instance has no attribute '__getitem__'
We're using a TkPioneer which is a subclass of TkRobot, subclassing
SimRobot. SimRobot has a method addDevice, which we use:
sim.addRobot(60000, TkPioneer("RedPioneer",
4.99, 1.32, 6.28,
((.225, .225, -.225, -.225),
(.175, -.175, -.175, .175)),
"red"))
# add some sensors:
sim.robots[0].addDevice(PioneerFrontSonars())
sim.robots[0].addDevice(BulbDevice(0.226, 0))
This works ok! We get a little robot with a light on his head!
Adding the device used the method addDevice in class SimRobot:
def addDevice(self, dev):
self.devices.append(dev)
if dev.type not in self.builtinDevices:
self.builtinDevices.append(dev.type)
if dev.type == "bulb":
self.simulator.lights.append( dev )
dev.robot = self
self.bulb = dev
<snip> etc...
But when we try to do this:
print "bulb is", sim.robots[0].bulb[0]
we get the error :
print "bulb is", sim.robots[0].bulb[0]
AttributeError: BulbDevice instance has no attribute '__getitem__'
Now, the Device class has a __getitem__ method but looking in pysim.py
shows that class BulbDevice is a child of class Light. And class Light
ISN'T a child of class Device.
I'm confused! Where do I go from here?
Ok, I think that you might be talking about two different interfaces:
1) the server-side simulator
2) the client-side robot
The client-side robot doesn't have an interface to the simulator (well,
not directly... you have to use the robot.simulation[0] device). BUT,
your code sample shows that you are combing sim with .bulb[0].
If you want to set the bulb brightness on the server side, then you
would use something like:
sim.robots[0].bulb.brightness
[We should make the two sides of the interface parallel... sigh... next
time!] Only one bulb per robot, it appears.
-Doug
regards
Matt
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--
Douglas S. Blank
Director, Institute for Personal Robots in Education (IPRE)
http://www.roboteducation.org
Chair, and Associate Professor, Computer Science, Bryn Mawr College
http://cs.brynmawr.edu/~dblank (610)526-6501
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