Python线程未启动

Question

然而，我已经创建了一个线程类，并对它们调用了start和join，然而，当我运行Thread.isAlive()时，所有它们都返回为False。我不确定我是否正确地设置了我的线程类，我尝试遵循这篇文章How to use threading in Python? Michael Safyan的答案。

这是我的Thread类

class Thread(threading.Thread):
def __init__(self, host, communityString, deviceID, script):
    super(Thread, self).__init__()
    self.host = host
    self.communityString=communityString
    self.deviceID = deviceID
    self.script=script

def CreateScript(self):
#ScriptsToGenerate = GetDatasourceScripts(deviceID)
    print self.script['scriptType']
    #We check if script type is SNMP and if it is we will add the oids that matter into the SNMP script
    if self.script['scriptType'] == "SNMP":
        print self.script['parentOID']
        #walk the parent node to see if these exist
        oidsToInputInScript = SNMPWalkChildren(self.host, self.communityString, self.script['OID'])
        print oidsToInputInScript
        if oidsToInputInScript != "":
            self.script['script'].replace("[oid]", oidsToInputInScript)

    SaveScript(self.host, self.script['timeInterval'], self.script)


def SaveScript(name, Interval, script):
    createFolder = ""

    for root, dirs, files in os.walk("/home/pi/", topdown=False):
        for name in dirs:
            if name == "myDir":
                createFolder = os.path.join(root, name)
                print createFolder

    absPath = createFolder + "/" + Interval
    print absPath
    if not os.path.exists(absPath):
        os.system("sudo mkdir " + absPath)
        os.chmod(absPath, stat.S_IRWXO | stat.S_IRWXU | stat.S_IRWXG)

    scriptName = name.replace(".", "")

    #create script file and save it in that location
    #need to replace "name" with a distinguishable name
    saveFile = absPath + "/" + scriptName + "_" + script["dsID"] + "_" + script["dpID"] + ".py"
    print saveFile
    with open(saveFile, "w") as script_file:
        os.chmod(saveFile, stat.S_IRWXO | stat.S_IRWXU | stat.S_IRWXG)
        script_file.write(script["text"])


def SNMPWalkChildren(host, communityString, OID):
    result = ""
    try:
        cmdGen = cmdgen.CommandGenerator()

        errorIndication, errorStatus, errorIndex, varBindTable = cmdGen.nextCmd(
            cmdgen.CommunityData(communityString),
            cmdgen.UdpTransportTarget((host, 161)),
            parentOID
        )

        if errorIndication:
            print(errorIndication)
        else:
            if errorStatus:
                print('%s at %s' % (
                    errorStatus.prettyPrint(),
                    errorIndex and varBindTable[-1][int(errorIndex)-1] or '?'
                    )
                )
            else:
                for varBindTableRow in varBindTable:
                    for name, val in varBindTableRow:
                        print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
                        result += "\"" + str(name) + "\"" + ', '
                return result[:-2]
    finally:
        return result

这就是我在线程上调用start的地方

threadList = list() 
#Loop through and create threads for each script
for scripts in ds:
    thread = Thread(name, communityString, deviceID, scripts)
    threadList.append(thread)
    print "Thread has started"
    print scripts
    thread.start()
    thread.join()

for threads in threadList:
    print(threads.isAlive())

Answer 1

每个线程在启动时加入；这意味着它必须在循环继续之前完成。因此，当您到达第二个for循环时，所有线程都已完成，因此没有一个线程仍处于活动状态。