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  • Python: Script works, but seems to deadlock after some time

    - by sberry2A
    I have the following script, which is working for the most part Link to PasteBin The script's job is to start a number of threads which in turn each start a subprocess with Popen. The output from each subprocess is as follows: 1 2 3 . . . n Done Bascially the subprocess is transferring 10M records from tables in one database to different tables in another db with a lot of data massaging/manipulation in between because of the different schemas. If the subprocess fails at any time in it's execution (bad records, duplicate primary keys, etc), or it completes successfully, it will output "Done\n". If there are no more records to select against for transfer then it will output "NO DATA\n" My intent was to create my script "tableTransfer.py" which would spawn a number of these processes, read their output, and in turn output information such as number of updates completed, time remaining, time elapsed, and number of transfers per second. I started running the process last night and checked in this morning to see it had deadlocked. There were not subprocceses running, there are still records to be updated, and the script had not exited. It was simply sitting there, no longer outputting the current information because no subprocces were running to update the total number complete which is what controls updates to the output. This is running on OS X. I am looking for three things: I would like to get rid of the possibility of this deadlock occurring so I don't need to check in on it as frequently. Is there some issue with locking? Am I doing this in a bad way (gThreading variable to control looping of spawning additional thread... etc.) I would appreciate some suggestions for improving my overall methodology. How should I handle ctrl-c exit? Right now I need to kill the process, but assume I should be able to use the signal module or other to catch the signal and kill the threads, is that right? I am not sure whether I should be pasting my entire script here, since I usually just paste snippets. Let me know if I should paste it here as well.

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  • Queuing methods to be run on an object by different threads in Python

    - by Ben
    Let's say I have an object who's class definition looks like: class Command: foo = 5 def run(self, bar): time.sleep(1) self.foo = bar return self.foo If this class is instantiated once, but different threads are hitting its run method (via an HTTP request, handled separately) passing in different args, what is the best method to queue them? Can this be done in the class definition itself?

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  • Modify an XML file in Python

    - by michele
    Hi, I have two file. I have to modify the file one in a particular node and add in a list of child. The list is in the file2. Can I do it, and how? from xml.dom.minidom import Document from xml.dom import minidom file1=modificare.xml file2=sorgente.xml xmldoc=minidom.parse(file1) for Node in xmldoc.getElementsByTagName("Sampler"): # put in the file2 content Thanks a lot.

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  • Python GUI does not update until entire process is finished

    - by ccwhite1
    I have a process that gets a files from a directory and puts them in a list. It then iterates that list in a loop. The last line of the loop being where it should update my gui display, then it begins the loop again with the next item in the list. My problem is that it does not actually update the gui until the entire process is complete, which depending on the size of the list could be 30 seconds to over a minute. This gives the feeling of the program being 'hung' What I wanted it to do was to process one line in the list, update the gui and then continue. Where did I go wrong? The line to update the list is # Populate listview with drive contents. The print statements are just for debug. def populateList(self): print "populateList" sSource = self.txSource.Value sDest = self.txDest.Value # re-intialize listview and validated list self.listView1.DeleteAllItems() self.validatedMove = None self.validatedMove = [] #Create list of files listOfFiles = getList(sSource) #prompt if no files detected if listOfFiles == []: self.lvActions.Append([datetime.datetime.now(),"Parse Source for .MP3 files","No .MP3 files in source directory"]) #Populate list after both Source and Dest are chosen if len(sDest) > 1 and len(sDest) > 1: print "-iterate listOfFiles" for file in listOfFiles: sFilename = os.path.basename(file) sTitle = getTitle(file) sArtist = getArtist(file) sAlbum = getAblum(file) # Make path = sDest + Artist + Album sDestDir = os.path.join (sDest, sArtist) sDestDir = os.path.join (sDestDir, sAlbum) #If file exists change destination to *.copyX.mp3 sDestDir = self.defineDestFilename(os.path.join(sDestDir,sFilename)) # Populate listview with drive contents self.listView1.Append([sFilename,sTitle,sArtist,sAlbum,sDestDir]) #populate list to later use in move command self.validatedMove.append([file,sDestDir]) print "-item added to SourceDest list" else: print "-list not iterated"

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  • Hot python input loop

    - by Josh K
    I'd like to have something similar to the following pseudo code: while input is not None and timer < 5: input = getChar() timer = time.time() - start if timer >= 5: print "took too long" else: print input Anyway to do this without threading? I would like an input method that returns whatever has been entered since the last time it was called, or None (null) if nothing was entered.

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  • Python __import__ parameter confusion

    - by CMC
    I'm trying to import a module, while passing some global variables, but it does not seem to work: File test_1: test_2 = __import__("test_2", {"testvar": 1}) File test_2: print testvar This seems like it should work, and print a 1, but I get the following error when I run test_1: Traceback (most recent call last): File ".../test_1.py", line 1, in <module> print testvar NameError: name 'testvar' is not defined What am I doing wrong?

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  • Message queue proxy in Python + Twisted

    - by gasper_k
    Hi, I want to implement a lightweight Message Queue proxy. It's job is to receive messages from a web application (PHP) and send them to the Message Queue server asynchronously. The reason for this proxy is that the MQ isn't always avaliable and is sometimes lagging, or even down, but I want to make sure the messages are delivered, and the web application returns immediately. So, PHP would send the message to the MQ proxy running on the same host. That proxy would save the messages to SQLite for persistence, in case of crashes. At the same time it would send the messages from SQLite to the MQ in batches when the connection is available, and delete them from SQLite. Now, the way I understand, there are these components in this service: message listener (listens to the messages from PHP and writes them to a Incoming Queue) DB flusher (reads messages from the Incoming Queue and saves them to a database; due to SQLite single-threadedness) MQ connection handler (keeps the connection to the MQ server online by reconnecting) message sender (collects messages from SQlite db and sends them to the MQ server, then removes them from db) I was thinking of using Twisted for #1 (TCPServer), but I'm having problem with integrating it with other points, which aren't event-driven. Intuition tells me that each of these points should be running in a separate thread, because all are IO-bound and independent of each other, but I could easily put them in a single thread. Even though, I couldn't find any good and clear (to me) examples on how to implement this worker thread aside of Twisted's main loop. The example I've started with is the chatserver.py, which uses service.Application and internet.TCPServer objects. If I start my own thread prior to creating TCPServer service, it runs a few times, but the it stops and never runs again. I'm not sure, why this is happening, but it's probably because I don't use threads with Twisted correctly. Any suggestions on how to implement a separate worker thread and keep Twisted? Do you have any alternative architectures in mind?

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  • python: send a list/dict over network

    - by facha
    Hi, everyone I'm looking for an easy way of packing/unpacking data structures for sending over the network: on client just before sending: a = ((1,2),(11,22,),(111,222)) message = pack(a) and then on server: a = unpack(message) Is there a library that could do pack/unpack magic? Thanks in advance

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  • implement bank using python programming

    - by prajakta
    Write software for a bank. The program should be menu driven with the facility for bank employees to perform various operations. It should be written using all concepts of Object Oriented programming. You should be able to save your data in a file and read it back (because the bank people will shut down their computers when they go home :p ) Guidelines: The program may select to implement classes like Bank, Account, Savings Account, Fixed Deposit account, Customer, Depositor, Borrower, Transaction, etc.

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  • One hour difference in Python

    - by Joel
    Hello, I have a datetime.datetime property var. I would like to know if it is less than one hour of the current time. Something like var.hour<datetime.datetime.today().hour - 1 Problem with the above syntax is that datetime.datetime.today().hour returns a number such as "10" and it is not really a date comparation but more of a numbers comparation. What is the correct syntax? Thanks! Joel

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  • Change/Update a pane using python wx.AUI

    - by Dan
    I'm using wx.AUI and having a bit of a problem managing panes. Once you have created a new pane using AddPane(), what is the syntax to update or change the pane? I've seen the SetPane command but I can't find any examples. Can someone direct me to an example? Or perhaps it makes sense to use some command to delete the pane and create a new one? Thanks in advance for your time.

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  • intersection of three sets in python?

    - by Phil Brown
    Currently I am stuck trying to find the intersection of three sets. Now these sets are really lists that I am converting into sets, and then trying to find the intersection of. Here's what I have so far: for list1 in masterlist: list1=thingList1 for list2 in masterlist: list2=thingList2 for list3 in masterlist: list3=thingList3 d3=[set(thingList1), set(thingList2), set(thingList3)] setmatches c= set.intersection(*map(set,d3)) print setmatches and I'm getting set([]) Script terminated. I know there's a much simpler and better way to do this, but I can't find one...

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  • Add entry to list and remove first one in Python

    - by wagglewax
    I have a list of about 40 entries. And I frequently want to append an item to the start of the list (with id 0) and want to delete the last entry (with id 40) of the list. how do i do this the best? like: (example with 5 entries) [0] = "herp" [1] = "derp" [2] = "blah" [3] = "what" [4] = "da..." after adding "wuggah" and deleting last it should be like: [0] = "wuggah" [1] = "herp" [2] = "derp" [3] = "blah" [4] = "what" or appending one and deleting first. And I don't want to end up manually moving them one after another all of the entries to the next id.

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  • Python beginner, strange output problem

    - by Protean
    I'm having a weird problem with the following piece of code. from math import sqrt def Permute(array): result1 = [] result2 = [] if len(array) <= 1: return array for subarray in Permute(array[1:]): for i in range(len(array)): temp1 = subarray[:i]+array[0]+subarray[i:] temp2 = [0] for num in range(len(array)-1): temp2[0] += (sqrt(pow((temp1[num+1][1][0]-temp1[num][1][0]),2) + pow((temp1[num+1][1][1]-temp1[num][1][1]),2))) result1.append(temp1+temp2) return result1 a = [['A',[50,1]]] b = [['B',[1,1]]] c = [['C',[100,1]]] array = [a,b,c] result1 = Permute(array) for i in range(len(result1)): print (result1[i]) print (len(result1)) What it does is find all the permutations of the points abc and then returns them along with the sum of the distances between each ordered point. It does this; however, it also seems to report a strange additional value, 99. I figure that the 99 is coming from the computation of the distance between point a and c but I don't understand why it is appearing in the final output as it does.

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  • Python: Beginning problems

    - by Blogger
    ok so basically i very new to programming and have no idea how to go about these problems help if you will ^^ Numerologists claim to be able to determine a person’s character traits based on the “numeric value” of a name. The value of a name is determined by summing up the values of the letters of the name, where ‘a’ is 1, ‘b’ is 2, ‘c’ is 3 etc., up to ‘z’ being 26. For example, the name “Zelle” would have the value 26 + 5 + 12 + 12 + 5 = 60 (which happens to be a very suspicious number, by the way). Write a program that calculates the numeric value of a single name provided as input. Word count. A common utility on Unix/Linux systems is a small program called “wc”. This program counts the number of lines, words (strings of characters separated by blanks, tabs, or new lines), and characters in a file. Write your own version of this program. The program should accept a file name as input and then print three numbers showing the count of lines, words, and characters in the file.

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  • Python thinks I'm a different IP

    - by Yongho
    I'm trying to set a page that displays the visitor's IP. All the methods I have tried show an IP different from the IP my computer has. I've tried: Looking up http://www.whatismyip.com/automation/n09230945.asp Using socket.getaddrinfo(socket.gethostname(), None)[0][4][0] How can I find the real IP of the visitor?

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  • Python how to execute generate code ?

    - by Natim
    Hello guys I have this code, and I would like to use the app parameter to generate the code instead of duplicating it. if app == 'map': try: from modulo.map.views import map return map(request, *args, **kwargs) except ImportError: pass elif app == 'schedule': try: from modulo.schedule.views import schedule_day return schedule_day(request, *args, **kwargs) except ImportError: pass elif app == 'sponsors': try: from modulo.sponsors.views import sponsors return sponsors(request, *args, **kwargs) except ImportError: pass elif app == 'streaming': try: from modulo.streaming.views import streaming return streaming(request, *args, **kwargs) except ImportError: pass Do you have any idea ? Thanks

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  • python packaging causes importerror

    - by Absolute0
    I am getting an annoying import error when I try to import a variable in an init.py file. I have attached the files involved and my directory structure: #/home/me/app/app/__init__.py from flaskext.sqlalchemy import SQLAlchemy db = SQLAlchemy(app) #/home/me/app/app/models/__init__.py from datetime import datetime from app import db #shell [me@archlinux app]$ pwd /home/me/app [me@archlinux app]$ ./manage.py /home/me/app/app/__init__.pyc Traceback (most recent call last): File "./manage.py", line 7, in <module> from app import app File "/home/me/app/app/__init__.py", line 3, in <module> from app.views.post import post File "/home/me/app/app/views/post.py", line 4, in <module> from app.models import Post File "/home/me/app/app/models/__init__.py", line 5, in <module> from app import db ImportError: cannot import name db [me@archlinux app]$ tree . +-- apikey.txt +-- manage.py +-- app ¦   +-- forms ¦   ¦   +-- __init__.py ¦   ¦   +-- __init__.py~ ¦   +-- __init__.py ¦   +-- __init__.py~ ¦   +-- __init__.pyc ¦   +-- models ¦   ¦   +-- __init__.py ¦   ¦   +-- __init__.py~ ¦   ¦   +-- __init__.pyc ¦   +-- static ¦   ¦   +-- css ¦   ¦   ¦   +-- style.css ¦   ¦   +-- images ¦   ¦   ¦   +-- favicon.png ¦   ¦   ¦   +-- logo.png ¦   ¦   ¦   +-- text_logo.png ¦   ¦   ¦   +-- thumb_down_active.png ¦   ¦   ¦   +-- thumb_down_inactive.png ¦   ¦   ¦   +-- thumb_up_active.png ¦   ¦   ¦   +-- thumb_up_inactive.png ¦   ¦   +-- js ¦   ¦   ¦   +-- index.js ¦   ¦   +-- sitemap.xml ¦   +-- templates ¦   ¦   +-- 404.html ¦   ¦   +-- 500.html ¦   ¦   +-- about.html ¦   ¦   +-- base.html ¦   ¦   +-- feedback ¦   ¦   ¦   +-- feedback_form.html ¦   ¦   +-- form.html ¦   ¦   +-- posts ¦   ¦   ¦   +-- comment.html ¦   ¦   ¦   +-- post.html ¦   ¦   ¦   +-- posts.html ¦   ¦   +-- spam.html ¦   ¦   +-- terms.html ¦   ¦   +-- users ¦   ¦   +-- login_form.html ¦   ¦   +-- sign_up_form.html ¦   +-- util ¦   ¦   +-- forms.py ¦   ¦   +-- honeypot.py ¦   ¦   +-- __init__.py ¦   ¦   +-- __init__.py~ ¦   ¦   +-- json_http.py ¦   ¦   +-- models.py ¦   ¦   +-- spam.py ¦   +-- views ¦   +-- feedback.py ¦   +-- __init__.py ¦   +-- __init__.pyc ¦   +-- post.py ¦   +-- post.pyc ¦   +-- user.py +-- settings.py +-- settings.pyc +-- TiddlyWiki.html 13 directories, 49 files What might be the problem?

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  • Access Denied when using popen - Python

    - by RadiantHex
    Hi folks, I'm using popen in order to send a few commands within a Django app. Problem is that I'm getting [Error 5] Access Denied, apparently I have no access to cmd.exe, which popen seems to use. WindowsError at /test/cmd/ [Error 5] Access is denied: 'C:\WINDOWS\system32\cmd.exe /c dir' I reckon this is because the app sits behind a web server which has limited privileges. Is there anything we can do about it? Help would be awesome!

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  • Using a regex to match IP addresses in Python

    - by MHibbin
    I'm trying to make a test for checking whether a sys.argv input matches the regex for an IP address... As a simple test, I have the following... import re pat = re.compile("\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}") test = pat.match(hostIP) if test: print "Acceptable ip address" else: print "Unacceptable ip address" However when I pass random values into it, it returns "Acceptable ip address" in most cases, except when I have an "address" that is basically equivalent to \d+ Any thoughts welcome. Cheers Matt

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  • making binned boxplot in matplotlib with numpy and scipy in Python

    - by user248237
    I have a 2-d array containing pairs of values and I'd like to make a boxplot of the y-values by different bins of the x-values. I.e. if the array is: my_array = array([[1, 40.5], [4.5, 60], ...]]) then I'd like to bin my_array[:, 0] and then for each of the bins, produce a boxplot of the corresponding my_array[:, 1] values that fall into each box. So in the end I want the plot to contain number of bins-many box plots. I tried the following: min_x = min(my_array[:, 0]) max_x = max(my_array[:, 1]) num_bins = 3 bins = linspace(min_x, max_x, num_bins) elts_to_bins = digitize(my_array[:, 0], bins) However, this gives me values in elts_to_bins that range from 1 to 3. I thought I should get 0-based indices for the bins, and I only wanted 3 bins. I'm assuming this is due to some trickyness with how bins are represented in linspace vs. digitize. What is the easiest way to achieve this? I want num_bins-many equally spaced bins, with the first bin containing the lower half of the data and the upper bin containing the upper half... i.e., I want each data point to fall into some bin, so that I can make a boxplot. thanks.

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