Raise AttributeError(name) error

[ameni mighri]

Hi ,
I compiled the following sample .py with ubuntu

import libraries

import Leap, sys

import API

from Leap import Hand , Vector , Matrix , Frame, CircleGesture, KeyTapGesture, ScreenTapGesture, SwipeGesture  , Listener

create a listener class

class SampleListener(Leap.Listener):
    def on_init(self, controller):
        print "Initialized"

    def on_connect(self, controller):
        print "Connected"

        # Enable gestures
        controller.enable_gesture(Leap.Gesture.TYPE_CIRCLE);
        controller.enable_gesture(Leap.Gesture.TYPE_KEY_TAP);
        controller.enable_gesture(Leap.Gesture.TYPE_SCREEN_TAP);
        controller.enable_gesture(Leap.Gesture.TYPE_SWIPE);

    def on_disconnect(self, controller):
        # Note: not dispatched when running in a debugger.
        print "Disconnected"

    def on_exit(self, controller):
        print "Exited"

    def on_frame(self, controller):
        # Get the most recent frame and report some basic information
       frame = controller.frame()
       if not frame.hands.is_empty:
           # Get the first hand
           hands = frame.hands[0]
           #create basis object
           #if not hands.basis.is_empty:
           basis = hands.basis
           if not  basis.x_basis.is_empty and not basis.y_basis.is_empty:
             x_basis = basis.x_basis
             y_basis = basis.y_basis
             vectorX = Leap.Vector(x_basis)
             vectorY = Leap.Vector(y_basis)
             #extract the coordinates
             x = this_vectorX.x
             y = this_vectorY.y
             if y > 0 :
              print " direction forward"
              if  y < 0 :
               print "direction backward"
               if x > 0 :
                print " direction right"
                if  x < 0 :
                 print "direction left"

    def state_string(self, state):
        if state == Leap.Gesture.STATE_START:
            return "STATE_START"

        if state == Leap.Gesture.STATE_UPDATE:
            return "STATE_UPDATE"

        if state == Leap.Gesture.STATE_STOP:
            return "STATE_STOP"

        if state == Leap.Gesture.STATE_INVALID:
            return "STATE_INVALID"

def main():
    # Create a sample listener and controller
    listener = SampleListener()
    controller = Leap.Controller()

    # Have the sample listener receive events from the controller
    controller.add_listener(listener)

    # Keep this process running until Enter is pressed
    print "Press Enter to quit..."
    sys.stdin.readline()

    # Remove the sample listener when done
    controller.remove_listener(listener)

if name == "main":
    main()   

The compilation gives no errors , but while execution i get the following message :
 File "/home/enova6/LeapDeveloperKit/LeapSDK/python/Leap.py", line 340, in
    getattr = lambda self, name: swiggetattr(self, Hand, name)
  File "/home/enova6/LeapDeveloperKit/LeapSDK/python/Leap.py", line 57, in swiggetattr
    raise AttributeError(name)
AttributeError: basis
Traceback (most recent call last):
  File "handDirection.py", line 36, in on_frame
    basis = hands.basis
  File "/home/enova6/LeapDeveloperKit/LeapSDK/python/Leap.py", line 340, in
    getattr = lambda self, name: swiggetattr(self, Hand, name)
  File "/home/enova6/LeapDeveloperKit/LeapSDK/python/Leap.py", line 57, in swiggetattr
    raise AttributeError(name)

i can't understand where does itt come from and how van i fix it ???

[jdonald]

For a language like Python, the fact that it compiles just means that you don't have any gross parse errors. Bugs like undefined variables or methods are reported at runtime.

In this case, there is no such property hands.basis. Note that hands is a list. I think you meant to do something like hands[0].basis.

[ameni mighri]

Thanks for helped , i solved the problem by switching into versio 2

[juliussalting]

Can you expound more on this? I'm encountering the same problem.