Timeout python function

timeout.py

class TimeoutError(Exception):
    pass

class timeout:
    def __init__(self, seconds=1, error_message='Timeout'):
        self.seconds = seconds
        self.error_message = error_message
    def handle_timeout(self, signum, frame):
        raise TimeoutError(self.error_message)
    def __enter__(self):
        signal.signal(signal.SIGALRM, self.handle_timeout)
        signal.alarm(self.seconds)
    def __exit__(self, type, value, traceback):
        signal.alarm(0)
        
# Usage
# try:
#      with timeout(10):
#          possible_long_running_func()
#  except TimeoutError:
#      print "Timeout"