Python in Linux environment on RPI

[kendias]

Thanks. I am able to print the GPS data but not able to write it to a file. The print statement prints the GPS Data into the python shell, but although I am able to get the file to open OK, the "f.write" statement does not write to it. My script is:

from gps import *
import time
import threading
f = open("locations.csv","w")
gpsd = None
class GpsPoller(threading.Thread):
   def __init__(self):
       threading.Thread.__init__(self)
       global gpsd
       gpsd=gps(mode=WATCH_ENABLE)
       self.current_value = None
       self.running = True
       #print (gpsd.fix.longitude)
       #print (gpsd.fix.latitude)
     
   def run(self):
       global gpsd
       while gpsp.running:
           gpsd.next()
           print (gpsd.fix.longitude)
           print (gpsd.fix.latitude)
        
if  __name__ == '__main__':
  
   gpsp=GpsPoller()
   try:
       gpsp.start()
      
       while True:
           f.write(str(gpsd.fix.longitude) + "," + str(gpsd.fix.latitude) + "\n") 
        
           time.sleep(30)
   except(KeyboardInterrupt,SystemExit):
       f.close()
       gpsp.running = False
       gpsp.join()