subscribes to a couple ros topics and prints them.

subscribe.py

#!/usr/bin/env python
import rospy
import time
from pidrone_pkg.msg import State
from sensor_msgs.msg import Range, Imu

def callbackRange(data):
      	import datetime
  	dt = datetime.datetime.now()
	print("range",data.range,dt.second+dt.microsecond/1000000.0," "," "," ")

def callbackHeightEMA(data):
	import datetime
	dt = datetime.datetime.now()
	print(" "," "," ","ema",data.pose_with_covariance.pose.position.z,dt.second+dt.microsecond/1000000.0)


def listener():
	rospy.init_node('subscribe', anonymous=True)
	rospy.Subscriber("/pidrone/state/ema", State, callbackHeightEMA)
	rospy.Subscriber("/pidrone/range",Range,callbackRange)
	rospy.spin()

if __name__ == '__main__':
	listener()