runtimeerror：最大递归深度超过python

Question

I keep getting this error"RuntimeError: maximum recursion depth exceeded while calling a Python object" when I try running my host program for smart card test tool with 600 tests and I get this error after the 300th test, I tried "sys.setrecursionlimit(10000)" and that fixed the problem, but I do know that this is not the best way to go about this error, how can I change my code so I don't run into this error:

def SndRcv(self,request):
    print ">> ", request
    device_api.send(request)
    resp = device_api.receive()
    print "<< ", resp
    self.processResponse(resp)

def processResponse(self, K400Message):
    global mWaitingCardRemoval
    ciMsg = card_interface_response
    ciMsgType = card_interface_response.ci_msg

    if ciMsgType is None:
        print 'weird, malformed protobuf response'
        return
    whichMsg = ciMsgType.WhichOneof('msg')
    print 'msg = ' + str(whichMsg)
    if whichMsg is 'collision':
        self.StartSession()
    elif whichMsg is 'card_removed':
        if ciMsgType.issuer== ci.CARD_INTERFACE_MASK_CxLESS:                
            mWaitingCardRemoval &= ~(ciMsgType.issuer)
            if EndofSession is False:
                self.parseMessage()
            if mWaitingCardRemoval !=0:
                self.parseMessage()
            self.StartSession()
    elif whichMsg is 'waiting_removal':
        if EndofSession is False:
            self.parseMessage()
        else:
            mWaitingCardRemoval |= ciMsgType.issuer
    elif whichMsg is 'card_detected':
        mode = ciMsgType.issuer
        reqMsg = pm.get_Deactivate((ci.CARD_INTERFACE_MASK_ANY)& ~(ciMsgType.issuer))
        self.SendOnly(reqMsg)
        acceptMsg = pm.get_Activate(mode)
        self.SndRcv(acceptMsg)
    elif whichMsg is 'card_ready':
        self.StartLoop(ciMsgType.issuer)
    elif whichMsg is 'rapdu':
        self.processCardAPDUResponse(ciMsgType.issuer, ciMsg.data.encode('hex'))
    elif whichMsg is 'card_not_responding':
        if ciMsgType.issuer == ci.CARD_INTERFACE_MASK_CONTACT:
            self.EndCardSession(ciMsgType.issuer,True)
        else:
            self.EndCardSession(ciMsgType.issuer, False)
    elif whichMsg is 'resp_special':
        if ciMsg.data.encode('hex') > 0:
            logging.info(ciMsg.data.encode('hex'))
        else:
            logging.info("")

Answer 1

You used recursion to code an inherently iterative process. You're not actually reducing a large problem to a smaller one; you're stepping through a sequence of inputs. Once you process an input and report the response, you're done with it. There's no reason to keep it's context on the call stack. When you hit the final test and return through your thousand-plus calls, you do nothing with the results or function state to return to the main program.

Rewrite this as a straightforward iteration. How do you start? How do you progress from one test to another? How do you know when you're done? For instance, it's quite possible that your outermost loop will hinge on a simple while :

# Get first response
while ciMsgType is not None:
    # Process this response
    # Get next response

Does that get you moving?