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POReusing variable between SocketServer requests
 

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  1. POReusing variable between SocketServer requests
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    <p>I want to create temporary variable for method inside class. and update the variable inside method. and i want to reuse <code>self.last_l</code> inside loop. but it doesn't work. </p> <p>here it is my code :</p> <pre><code>import socket, mouseapi, mouseinput from sys import stdout, exit from decimal import Decimal from math import fabs from datetime import datetime import time import SocketServer UDP_IP = "192.168.1.100" UDP_PORT = 5005 class MyUDPHandler(SocketServer.BaseRequestHandler): def setup(self): self.before = 0 self.noise = 1.5 self.noise_f = 0.8 self.last_l = 0 # i want this temporary and updated on handle() def handle(self): data = self.request[0].strip() socket = self.request[1] start = time.clock() ndata = data.replace("[","") ndata = data.replace("]","") ndata = ndata.split(", ") try: ndata[1] = ("%.2f" % float(ndata[1])) atas = ndata[1] atas_bawah = int(int(float(atas)*100)) selisih = fabs(float(atas)-float(self.last_l)) # used here if selisih &gt; self.noise_f: print "Selisih -&gt; %.2f" % float(selisih) print "Sensor -&gt; %.2f" % float(atas) self.last_l = atas # and updated here atas_bawah = int(int(float(atas)*100)) end = time.clock() print "Latency -&gt; %.2gs" % (end-start) if self.last_l == 0: self.last_l = atas # or updated here except KeyboardInterrupt: sys.exit(1) if __name__ == "__main__": HOST, PORT = UDP_IP, UDP_PORT server = SocketServer.UDPServer((HOST, PORT), MyUDPHandler) server.serve_forever() </code></pre> <p>So i expect to print selisih value is less than 1 or more. but it give me more than 1. </p> <pre><code>Selisih -&gt; 6.53 Sensor -&gt; 6.53 Latency -&gt; 3.1e-05s Selisih -&gt; 6.70 Sensor -&gt; 6.70 Latency -&gt; 2.8e-05s Selisih -&gt; 6.97 Sensor -&gt; 6.97 Latency -&gt; 4.1e-05s Selisih -&gt; 7.15 Sensor -&gt; 7.15 Latency -&gt; 2.1e-05s Selisih -&gt; 7.14 Sensor -&gt; 7.14 Latency -&gt; 2.2e-05s Selisih -&gt; 7.14 Sensor -&gt; 7.14 Latency -&gt; 2.1e-05s Selisih -&gt; 7.05 Sensor -&gt; 7.05 Latency -&gt; 2.2e-05s Selisih -&gt; 7.02 Sensor -&gt; 7.02 Latency -&gt; 2.2e-05s </code></pre> <p><strong>I've tried to make last_l with global scope. still won't work.</strong></p> <p>and I get <code>UnboundLocalError: local variable 'last_l' referenced before assignment</code> when i try to place <code>global last_l</code> followed by <code>last_l = 0</code> anywhere and change <code>self.last_l</code> to <code>last_l</code> inside <code>handle</code> method.</p>
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    1. USAndrey Lebedev
    1. USYuda Prawira
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    1. COCan you explain what exactly do you mean by `it doesn't work`?
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      1. USaIKid
    2. COOff-topic: i see that you are indonesian.. :) Jarang ketemu orang indo disini XD
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    3. COAre you sure that the statement behind your try block runs without error? I would first guess that somewhere you get ValueError and run only the `pass` line all the time. Note that simply passing through ValueErrors is not a good routine, because they might give you prescious info of where your error is.
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      1. USleeladam
 

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