python - 为什么这个Python函数执行后不释放内存？

Question

我有一个 Python 脚本，它通过 Beautiful Soup 传递的 XML 文件查找文本术语。然后我遍历到我想要提取的值并返回字符串。这行得通，但是因为我在程序主循环中添加了对该函数的调用，所以我最终遇到了 MemoryError 问题。查看 Windows 任务管理器，我发现每次调用后内存都没有释放，系统内存不足。问题似乎是“return myLink.string”行。这是否包含对内存中对象的引用，我该如何解决这个问题？

def FindUptime(soup):
    link = soup.find(text=re.compile("Uptime"))
    if link:
        myLink = link.parent
        myLink = myLink.next_sibling
        if myLink.string == "Up:":
            myLink = myLink.next_sibling
            myLink = myLink.next_element
        else:
            print "Can't find Up: term"
        return myLink.string
    else:
        print "Can't find Uptime"
        return ""

调用者

readings[sensorIds[i][SENSOR_NAME]] = FindUptime(soup)

Answer 1

修改为...

def FindUptime(soup):
    link = soup.find(text=re.compile("Uptime"))
    if link:
        myLink = link.parent
        myLink = myLink.next_sibling
        if myLink.string == "Up:":
            myLink = myLink.next_sibling
            myLink = myLink.next_element
        else:
            print "Can't find Up: term"
        uptime = str(myLink.string) # added
        return uptime
    else:
        print "Can't find Uptime"
    return ""