python中的time.sleep无法正常工作，但会立即退出

Question

I am using below code in Nifi in executeScript and have added time.sleep to add delay in the code so that it tries after some time but this does not work as expected. It prints the logs one after the other without waiting

 class ModJSON(StreamCallback):
        def __init__(self):
            pass

        def process(self, inputStream, outputStream):
            text = IOUtils.toString(inputStream, StandardCharsets.UTF_8)
            obj = json.loads(text)
            response = self._updateelasticsearch(timestamp, flowID, elasticSearchURL, indexName)
            log.error("response : " + response)
            flowcounter = 1

            while (response.find('"updated":1') == -1 & flowcounter < 35):
                flowcounter += 1
                time.sleep(50)
                response = self._updateelasticsearch(timestamp, flowID, elasticSearchURL, indexName)

            flowcounter = 0
            outputStream.write(bytearray(json.dumps(response, indent=4).encode('utf-8')))

        def _updateelasticsearch(self, timestamp, flowID, elasticSearchURL, indexName):
            try:
                #update code
            return rest_response

        def _validateIfExist(self, flowid, elasticSearchURL, indexName) :
            #validatecode

            if record_count > 0:
                return True
            else :
                return False


    flowFile = session.get()
    if (flowFile != None):
        flowFile = session.write(flowFile, ModJSON())
        session.transfer(flowFile, REL_SUCCESS)
        session.commit()

Answer 1

I suspect your while loop is never being entered.

while (response.find('"updated":1') == -1 & flowcounter < 35):
                                          ^ problem

The bitwise & operator behaves differently than the boolean and operator. & has different precedence than and , so it can give surprising results:

>>> 1 == 1 & 2 == 2
False

Similarly, your expression response.find('"updated":1') == -1 & flowcounter < 35 only evaluates to True when response.find('"updated":1') == (-1 & flowcounter) and when (-1 & flowcounter) < 35 . (-1 & flowcounter) is never equal to -1 when flowcounter is positive, so your conditional will never succeed when response.find('"updated":1') returns -1.

If you're only trying to logically chain together clauses in a conditional, use and .

while (response.find('"updated":1') == -1 and flowcounter < 35):