How to catch and handle signals in python3

python-signals.py

# 
# https://scripting.tips/complete-guide-to-writing-command-line-tools.html
#
# How to handle signals in python
# Use ctrl+c to send SIGINT and ctrl+z to send SIGTSTP (then `fg` to send SIGCONT)
#

import signal, time, sys, os
import logging
from logging import info


def sigint_handler(signum, frame):
    info(f'sigint_handler: Received signal {signum} on frame {frame}')
    sys.exit(0)

    
def sigtstp_handler(signum, frame):
    info(f'sigtstp_hangler: Received signal {signum} on frame {frame}')
    # ... release your resources here ...
    # Remove our handler
    signal.signal(signum, signal.SIG_DFL)
    # Resend signal to pause process
    os.kill(os.getpid(), signum)
    # Back from suspend -- reestablish the handler.
    signal.signal(signal.SIGTSTP, sigtstp_handler)

    
def sigcont_handler(signum, frame):
    info(f'sigcont_handler: Received signal {signum} on frame {frame}')
    time.sleep(0.5) # acquire resources here ...
    info('Ready to go')


    
 
logging.basicConfig(level=logging.INFO, format='\n%(message)s')

# Assign handlers to signals
signal.signal(signal.SIGINT, sigint_handler)
signal.signal(signal.SIGTSTP, sigtstp_handler)
signal.signal(signal.SIGCONT, sigcont_handler)

while True:
    for col in range(80):
        print('a', end='', flush=True)
        time.sleep(0.1)
    print()