Adding label track using pipe-mod-script

I am trying to load label tracks using pipe-mod-script. It is working fine for one sample label file but for the second label file it is writing the outputs in the same label track. How can I change the label track. Below is the code

# Sends commands to get images for the manual.
# Images for

# Make sure Audacity is running first and that mod-script-pipe is enabled
# before running this script.
# Modified by me
#load and run the common core.
exec( open("" ).read() )
import numpy as np
import argparse

def read_audacity_labels(filename):
    lbls = np.genfromtxt(filename, dtype=[('start', 'f',),('stop','f'),('label','S20')], delimiter = '\t', autostrip=True)
    return lbls

def addLabels(label_num, st_time, end_time, label_txt):
    #do( 'Select: Start=0 End=1' )
    do( 'AddLabel' )
    do( 'SetLabel: Label={} Text={} Start={} End={} '.format(label_num, label_txt, st_time, end_time))

def new_track():
     do( 'NewLabelTrack' )


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description=""" Audacity label file mod-script parser""")
    parser.add_argument("--labelpath", type = str,help= 'audacity label path')
    args = parser.parse_args()
    label_file = args.labelpath
    lbls = read_audacity_labels(label_file)
    count = 0
    for i in lbls:
        addLabels(count,i['start'], i['stop'], i['label'])
        #count += 1

To run the pipeline (suppose filename is

python --labelpath "./aud_labelfile.txt"

Please guide.

Move focus to the label track where you want the labels to appear, then add the labels.