python限制函数的执行时间

import signal

class TimeoutException(Exception):
    pass

def timeout_handler(signum, frame):
    raise TimeoutException()

def limit_time(seconds=10):
    def decorator(func):
        def wrapper(*args, **kwargs):
            signal.signal(signal.SIGALRM, timeout_handler)
            signal.alarm(seconds)
            try:
                result = func(*args, **kwargs)
            except TimeoutException:
                return None
            finally:
                signal.alarm(0)
            return result
        return wrapper
    return decorator

运行

@limit_time(seconds=5)
def my_function():
    # 在这里编写需要限制执行时间的代码
    pass

result = my_function()