Reply To: Tobii Pro Fusion with python, cannot print gaze data

[daisuke]

Yes, I have installed the runtime service and confirmed that it is running on task manager.
I have also done the initial device setup.
When I enable the gaze visualization in ETM, gaze position is displayed without any problems.

I get no error massages and gaze data.
But the following code returns an error “‘left_pd’ is not defined”

import tobii_research as tr

found_eyetrackers = []
while len(found_eyetrackers) == 0:
    found_eyetrackers = tr.find_all_eyetrackers()
my_eyetracker = found_eyetrackers[0]

def gaze_data_callback(gaze_data):
    left_pd = gaze_data['left_pupil_diameter']
    right_pd = gaze_data['right_pupil_diameter']

my_eyetracker.subscribe_to(
        tr.EYETRACKER_GAZE_DATA, gaze_data_callback, as_dictionary=False)

pd = (left_pd + right_pd)/2

I wondered if you could help me.