如何在Python中限制函数调用的执行时间

import signal
import time

def handler(signum, frame):
    raise Exception("Time limit exceeded")

def limit_execution_time(func, time_limit):
    signal.signal(signal.SIGALRM, handler)
    signal.alarm(time_limit)
    try:
        result = func()
        signal.alarm(0)
        return result
    except Exception as e:
        signal.alarm(0)
        raise e

def my_function():
    time.sleep(5)
    return "Function completed"

try:
    result = limit_execution_time(my_function, 2)
    print(result)
except Exception as e:
    print(e)