recursion - Python HTTP Request that runs every second, infinitely, and compares to previous iteration -


i'm using plex , trying use plex api , continually update status of plex server. if status changes, have couple of things does. here's code (i've redacted irrelevant portions):

import requests import time  ip = '127.0.0.1' port = '####'   def get_status(last_media_type, last_state):     data = requests.get('http://' + ip + ':' + port + '/status/sessions', verify=false)     if home:  # ignore part. redacted code         if '<mediacontainer size="0">' in data.text:  # if nothing playing             media_type = 'none'             state = 'stopped'         else:  #  what's playing , status             media_type_start = data.text.find('type=\"')             media_type_end = data.text.find('updatedat=')             media_type = data.text[media_type_start + 6:media_type_end - 2].capitalize()             print('type: ' + str(media_type))             state_prefix_start = data.text.find('<player address=')             state_prefix_end = data.text.find('<transcodesession key=')             state_prefix = data.text[state_prefix_start:state_prefix_end]             state_start = state_prefix.find('state=\"')             state_end = state_prefix.find('title=')             state = state_prefix[state_start + 7:state_end - 2].upper()         if last_media_type != media_type or last_state != state:  # important. don't want execute next part if nothing has changed.             # stuff, redacted         if state == 'playing':             interval = 1         elif state == 'paused':             interval = 10         elif state == 'stopped':             interval = 15     else:         interval = 60 * 3  # if nobody home, check once every 3 minutes     time.sleep(interval)     get_status(media_type, state)  get_status('a', 'b')  # filler arguments used initiate script

the problem

unfortunately, after half hour or so, get:

recursionerror: maximum recursion depth exceeded in comparison

this traceback (although line numbers won't match due redaction):

traceback (most recent call last):   file "h:/users/micha/documents/scripts/python/plexstatus.pyw", line 63, in <module>     p = psutil.process(os.getpid())  # pid script   file "c:\python351\lib\site-packages\psutil\__init__.py", line 349, in __init__     self._init(pid)   file "c:\python351\lib\site-packages\psutil\__init__.py", line 375, in _init     self.create_time()   file "c:\python351\lib\site-packages\psutil\__init__.py", line 636, in create_time     self._create_time = self._proc.create_time()   file "c:\python351\lib\site-packages\psutil\_pswindows.py", line 282, in wrapper     return fun(self, *args, **kwargs)   file "c:\python351\lib\site-packages\psutil\_pswindows.py", line 422, in create_time     if self.pid in (0, 4): recursionerror: maximum recursion depth exceeded in comparison

the questions

how can work without recursion error while still waiting 1 second between executions?

my guess there's better way call script, while still being able use variables previous call. can't figure out how. think can use pickle i'm using in redacted part, i'd avoid ton of read/writes if possible. or really, make little of memory hog possible while still retaining functionality.

notes: i'm sure there's better way parse. i'm new programming. researching concurrently fix this.

i've edited code few times while trying fix this, i'm not sure won't throw other error. it's recursion i'm trying fix.

i know there tools plexpy this. trying write 1 myself smaller , can run continuously without being major resource hog.

recursion means each function call stays on stack, hence run out of memory leading recursionerror. in other there ways around using "tail-call recursion", you've done - except python never support this.

the best way run modify code have infinite loop:

def get_status(last_media_type, last_state):     pass # method here          # except recursive call     return state, media_type  last_state = none last_media_type = 'sensible_default' while true:     state, media_type = get_status(last_media_type, last_state)     pass # need compare them here      if last_state != state , last_media_type != media_type:          print "they aren't equal!"             last_state, last_media_type = state, media_type

the loop (while true:) consume practically no memory, , instead of storing every single past state, have last one.

additionally, information in method call garbage collected loses scope when method returns - direct improvement on code, in recursive call nothing ever loses scope nothing cal ever collected.


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