超时检测装饰器，给任意可能会hang住的函数添加超时功能

Decorator-Timeout.py

import signal,functools 

class TimeoutError(Exception): 
    pass #定义一个Exception，后面超时抛出 

def timeout(seconds, error_message = 'Function call timed out'): 
    def decorated(func): def _handle_timeout(signum, frame): 
        raise TimeoutError(error_message) 
            def wrapper(*args, **kwargs): 
                signal.signal(signal.SIGALRM, _handle_timeout) 
                signal.alarm(seconds) 
                try: 
                    result = func(*args, **kwargs) 
                finally: 
                    signal.alarm(0) 
                return result 
            return functools.wraps(func)(wrapper) 
    return decorated