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POPython script freezes for no apparent reason (afaik)
 

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  1. POPython script freezes for no apparent reason (afaik)
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    <p>i'm not particularly new at python but i just thought there might be a reason for this program not working properly. i have written a similar one from which this is derived, and that still works fine. it is a program to graph the average time of a set of ping responses, to see if there is any pattern in the time over the day. the source is as follows</p> <pre><code>from Tkinter import * import matplotlib import time import os, sys, threading, Queue matplotlib.use('TkAgg') from numpy import arange, array, sin, pi from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg from matplotlib.figure import Figure import Tkinter import sys class App(object): def __init__(self): self.q = Queue.Queue() self.q2 = Queue.Queue() self.avvals=[] self.addlist=['bbc.co.uk', 'google.co.uk', 'nhgs.co.uk', 'bing.co.uk', 'msn.com'] self.addlistlen = len(self.addlist) self.root = Tkinter.Tk() self.root.wm_title("Connection Speed") self.frame = Tkinter.Frame(self.root) self.frame.pack(side='top', expand=1, fill='both',) self.frame2 = Tkinter.Frame(self.frame) self.frame2.pack(side='bottom', expand=1, fill='both',) self.f = Figure(figsize=(5,4), dpi=100) self.a = self.f.add_subplot(111) self.gframe = Tkinter.Frame(self.frame) self.gframe.pack(side='top', expand=1, fill='both',) self.canvas = FigureCanvasTkAgg(self.f, master=self.gframe) self.canvas.show() self.canvas.get_tk_widget().pack(side='top', fill='both', expand=1) self.canvas._tkcanvas.pack(side='top', fill='both', expand=1) self.lt = threading.Thread(target=self.loop()) def getping(self, add): pingaling = os.popen("ping -n 2 "+str(add).strip()) sys.stdout.flush() line = pingaling.read() if line: try: line = line.split('Maximum = ')[1] time = line.split('ms, Average')[0] self.q.put(int(time)) except: self.q.put(None) def gpthread(self, *a): t = threading.Thread(target=self.getping, args=a) t.isDaemon = True t.start() def loop(self): while 1: for x in self.addlist: self.gpthread(x) while self.q.qsize&lt;self.addlistlen: pass tl = [] for u in range(self.addlistlen): temp = self.q.get() if temp != None: tl.append(temp) if len(tl)&gt;0: self.update(sum(tl)/len(tl)) else: self.update(None) def update(self, val): self.a.clear() self.avvals.append(val) self.a.plot(self.avvals, linewidth=0.5, color = 'b') self.canvas.draw() a = App() try: a.root.mainloop() except: a.root.destroy() </code></pre> <p>i probably dont need the bottom try..except but i put it in to check if it would make a difference. i haven't had a chance to try it on another computer, but my other scripts are working fine so.... i simply can't comprehend why it freezes, stops responding, and if i exit it by any method i get a error saying Fatal python error: PyEval NULL tstate or somthing very similar. now it doesn't even expand! it just goes straight to not responding!</p>
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