debug_python.py

"""
To debug the program, send the SIGUSR2 to the PID. You can find the PID by using 'ps aux | grep python'
kill -SIGUSR2 {PID}
"""
import signal
import pdb

def open_debug(sig, frame):
    print 'sig', sig
    pdb.set_trace()

signal.signal(signal.SIGUSR2, open_debug)

# a long-running example
import time
while True:
  print("sleep now")
  time.sleep(5)