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• Jython project in Eclipse can't find the xml module, but works in an identical project

  - by Rob Lourens

  I have two projects in Eclipse with Java and Python code, using Jython. Also I'm using PyDev. One project can import and use the xml module just fine, and the other gives the error ImportError: No module named xml. As far as I can tell, all the project properties are set identically. The working project was created from scratch and the other comes from code checked out of an svn repository and put into a new project. What could be the difference? edit- Same for os, btw. It's just missing some path somewhere...

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• rreplace - How to replace the last occurence of an expression in a string

  - by Barthelemy

  Is there a quick way in Python to replace strings by starting from the end? For example: >>> def rreplace(old, new, occurence) >>> ... # Code to replace the last occurences of old by new >>> '<div><div>Hello</div></div>'.rreplace('</div>','</bad>',1) >>> '<div><div>Hello</div></bad>'

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• AppEngine Outage? What's happening?

  - by Albert

  I'm getting a lot of 500 errors recently (both static and dynamic requests). Making my application unavailable. The logs say the following: A problem was encountered with the process that handled this request, causing it to exit. This is likely to cause a new process to be used for the next request to your application. (Error code 121) The same code has been working well for quite some time. What's happening now? I'm using the High Replication Datastore and Python 2.5.

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• Twisted Matrix and telnet server implementation

  - by ypercube

  I have a project which is essentially a game server where users connect and send text commands via telnet. The code is in C and really old and unmodular and has several bugs and missing features. The main function alone is half the code. I came to the conclusion that rewriting it in TwistedMachine could actually result in faster completement, besides other benefits. So, here is the questions: What packages and modules I should use? I see a "telnet" module inside "protocols" package. I also see "cronch" package with "ssh" and another "telnet" module. I'm a complete novice regarding Python.

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• Numeric GUI bottleneck

  - by Physic

  Hi all, I've made a GUI to set up and start a numerical integrator using PyQT4, Wing, QT, and Python 2.6.6, on my Mac. The thing is, when I run the integrator form the GUI, it takes very many times longer than when I crudely run the integrator from the command line. As an example, a 1000 year integration took 98 seconds on the command line and ~570 seconds from the GUI. In the GUI, the integration runs from a thread and then returns. It uses a a queue to communicate back to the GUI. Does anyone have any ideas as to where the bottleneck is? I suspect that others may be experiencing something like this just on a smaller scale. t = threading.Thread( target=self.threadsafe_start_thread, args=( self.queue, self.selected ) ) t.start() Thanks!

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• how to get unique values set from a repeating values list

  - by Mariselvam

  I need to parse a large log file (flat file), which contains two column of values (column-A , column-B). Values in both columns are repeating. I need to find for each unique value in column-A , I need to find a set of column-B values. Is this can be done using unix shell command or need to write any perl or python script? What are the ways this can be done? Example: xxxA 2 xxxA 1 xxxB 2 XXXC 3 XXXA 3 xxxD 4 output: xxxA - 2,1,3 xxxB - 2 xxxC - 3 xxxD - 4

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• remove the spaces...

  - by tekknolagi

  !/usr/bin/python import random lower_a = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'] upper_a = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'] num = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'] all = [] all = " ".join("".join(lower_a) + "".join(upper_a) + "".join(num)) all = all.split() x = 0 while x < 10: for i in range(7): a = random.choice(all) print a, print x += 1 what i want to do is remove the spaces from the output what it gives now is Z 3 a A I K R G B i N 9 c E v g E r A N 8 e B 6 d v H O c a V 8 c x y b g 2 W a T T f 8 H T r 6 E p D K l 5 p u x q 8 P Z 9 T n I W X n B Q

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• Decoding MIME (HTML+Attachments)

  - by MH

  I'm planning to write an application that should handle incoming mails. Basically it will act more like a ticketing system than a webmail, so I'm only interested in receiving emails, and not sending them. I have made a simple prototype that downloads mails and displays the text with downloadable attachments in a web page, but handling mails from Outlook and others is more complicated. I have looked at some of the open source ticketing systems out there, but most of the code is tied to the system and is hard to separate. Is there a library that understands "rich" mail and makes this job simpler? Preferably in Python, Java, Ruby or Perl. I'm also open to suggestions for any command line mail clients that can be used for this, since the system will not receive large amounts of mail and can afford to launch external processes.

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• Strange PYTHONPATH problem

  - by DoxaLogos

  I recently updated my python installation to 2.7 (previously 2.5), and I've noticed a strange problem where I cannot import certain modules that I created. I had no problem before. Normally, I edit the PYTHONPATH and add the directory I want to import modules. For some strange reason, I can no longer import. I checked my path in PYTHONPATH, and it looked correct. When I display the sys.path in an interpreter, I see the current directory prepended to every PYTHONPATH entry(i.e. 'c:\blah\blah c:\path\to\module') If I edit the sys.path by appending the directory that I want at the end of the list,everything works fine(i.e. 'c:\path\to\module\'). I never had to do this before. I'm on Windows 7 on two computers. Has anyone else had similar trouble?

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• Throw blank even-numbered/left pages

  - by TimGJ

  I am trying to typeset a large document using ReportLab and Python 2.7. It has a number of sections (about 6 in a 1,000 page document) and I would like each to start on odd-numbered/right-hand page. I have no idea though whether the preceding page will be odd or even and so need the ability to optionally throw an additional blank page before a particular paragraph style (like you sometimes get in manuals where some pages are "intentionally left blank"). Can anyone suggest how this could be done, as the only conditional page break I can find works on the basis of the amount of text on the page not a page number. I also need to make sure that the blank page is included in the PDF so that double-sided printing works.

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• A 3-D grid of regularly spaced points

  - by Jack

  I want to create a list containing the 3-D coords of a grid of regularly spaced points, each as a 3-element tuple. I'm looking for advice on the most efficient way to do this. In C++ for instance, I simply loop over three nested loops, one for each coordinate. In Matlab, I would probably use the meshgrid function (which would do it in one command). I've read about meshgrid and mgrid in Python, and I've also read that using numpy's broadcasting rules is more efficient. It seems to me that using the zip function in combination with the numpy broadcast rules might be the most efficient way, but zip doesn't seem to be overloaded in numpy.

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• If I start learning C on Ubuntu will it give me an edge when I start learning Objective-C later this

  - by Anonymous

  I know Ruby right now, however I want to learn a new language. I am running Ubuntu 10.04 right now but I am going to get a Mac later this summer. Anyways I want something more for GUI development. I was wondering if I should learn C on Ubuntu right now, and then learn Objective-C when I get an iMac? Will learning C give me an edge? Or should I just learn Python on Ubuntu and then learn Objective-C when I get a new computer? Please give me your opinions! Thanks!

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• can list be converted into string

  - by PARIJAT

  Actually i have extracted some data from the file and want to write it in the file 2 but the program says 'sequence item 1: expected string, list found', I want to know how i can convert buffer[] ie string into sequence, so that it could be saved in file 2...I am new to the python please help* file = open('/ddfs/user/data/k/ktrip_01/hmm.txt','r') file2 = open('/ddfs/user/data/k/ktrip_01/hmm_write.txt','w') buffer = [] rec = file.readlines() for line in rec : field = line.split() print '>',field[0] term = field[0] buffer.append(term) print field[1], field[2], field[6], field[12] term1 = field [1] buffer.append(term1) term2 = field[2] buffer.append[term2] term3 = field[6] buffer.append[term3] term4 = field[12] buffer.append[term4] file2.write(buffer) file.close() file2.close()

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• OpenID login on local development server for google app engine

  - by Alex Jeffery

  Are you able to use open id to log into the local development server with google app engine sdk version 1.4.1 and python 2.5? When I execute this self.redirect(users.create_login_url(continue_url, None, openid_url)) I get redirected to http://localhost/_ah/login rather than the openid url. The openid url and continue url are valid. My app.yaml looks like this - url: /_ah/login_required script: do_openid_login.py - url: /users/(.*) script: routers/user_router.py login: required If I browse to http://localhost/users/ I am also redirected to http://localhost/_ah/login rather than http://localhost/_ah/login_required Is there a config issue or does openid not work locally?

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• Iterate over the lines of a string

  - by Space_C0wb0y

  I have a multi-line string defined like this: foo = """ this is a multi-line string. """ I need an iterator that iterates over the individual lines of that string. I could of course do it like this: lineiterator = iter(foo.splitlines()) Is there a more direct way of doing this? In this scenario the string has to traversed once for the splitting, and then again by the parser. It doesn't matter in my test-case, since the string is very short there, I am just asking out of curiosity. Python has so many useful and efficient built-ins for such stuff, but I could find nothing that suits this need.

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• Correct approach to validate attributes of an instance of class

  - by systempuntoout

  Having a simple Python class like this: class Spam(object): __init__(self, description, value): self.description = description self.value = value Which is the correct approach to check these constraints: "description cannot be empty" "value must be greater than zero" Should i: 1.validate data before creating spam object ? 2.check data on __init__ method ? 3.create an is_valid method on Spam class and call it with spam.isValid() ? 4.create an is_valid static method on Spam class and call it with Spam.isValid(description, value) ? 5.check data on setters declaration ? 6.... Could you recommend a well designed\Pythonic\not verbose (on class with many attributes)\elegant approach?

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• How to reduce latency of data sent through a REST api

  - by Sid

  I have an application which obtains data in JSON format from one of our other servers. The problem I am facing is, there is is significant delay when when requesting for this information. Since a lot of data is passed (approx 1000 records per request where each record is pretty huge) is there a way that compression would help reducing the speed. If so which compression scheme would you recommend. I read on another thread that they pattern of data also matters a lot on they type of compression that needs to be used. The pattern of data is consistent and resembles the following :desc=>some_description :url=>some_url :content=>some_content :score=>some_score :more_attributes=>more_data Can someone recommend a solution to how I could reduce this delay. They delay is approx 6-8 seconds. I'm using Ruby on Rails to develop this application and the server providing the data uses Python for the most part.

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• Capture subprocess output

  - by schneck

  Hi there, I learned that when executing commands in Python, I should use subprocess. What I'm trying to achieve is to encode a file via ffmpeg and observe the program output until the file is done. Ffmpeg logs the progress to stderr. If I try something like this: child = subprocess.Popen(command, shell=True, stderr=subprocess.PIPE) complete = False while not complete: stderr = child.communicate() # Get progress print "Progress here later" if child.poll() is not None: complete = True time.sleep(2) the programm does not continue after calling child.communicate() and waits for the command to complete. Is there any other way to follow the output?

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• How to schedule hundreds of thousands of tasks?

  - by wehriam

  We have hundreds of thousands of tasks that need to be run at a variety of arbitrary intervals, some every hour, some every day, and so on. The tasks are resource intensive and need to be distributed across many machines. Right now tasks are stored in a database with an "execute at this time" timestamp. To find tasks that need to be executed, we query the database for jobs that are due to be executed, then update the timestamps when the task is complete. Naturally this leads to a substantial write load on the database. As far as I can tell, we are looking for something to release tasks into a queue at a set interval. (Workers could then request tasks from that queue.) What is the best way to schedule recurring tasks at scale? For what it's worth we're largely using Python, although we have no problems using components (RabbitMQ?) written in other languages.

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• Upon USB insert, record unique identifer sting, format drive to FAT32 and copy a file. Bash or Pytho

  - by samsixty

  Hello, This is what I want to do, insert USB flash drive. mount it. record uniquie identifer string to a file. format the drive to FAT32. copy a text file to the drive. unmount it. remove the drive. 30 times The situation is this, I have bought 30 usb drives. I need to format each one to ensure they are clean, I need the unique string from each device. I need to put the same txt file on each one. I am not great at writing scripts but can read and follow bash and python. Any pointers would be appreciated.

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• Running the script for the 2-nd time, the messages are not retrieved from the mail server

  - by Max Li

  I read the mails from my gmail account with the code following below. import poplib pop_conn = poplib.POP3_SSL('pop.gmail.com') pop_conn.user('user') # result: '+OK send PASS' pop_conn.pass_('password') # result: '+OK Welcome.' print pop_conn.list()[1] pop_conn.quit() It shows me 1 message as expected. However, if I run this script for the second time, I get 0 messages as result. On the server the message is still there and unread. How can I get all the messages also running the script for the second time? For me it behaves as an email client that doesn't download the same mail twice. Is there some flag to force the program to download everything again? I use python 2.7.x on ubuntu 12.10

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• xml parsing takes extra spaces.

  - by SDK

  I have been trying to write/parse xml file in python. The tags are very simple <main> <data> abcdef </data> </main> I have written this xml using xml document writer from xml.dom.minidom. How-ever when i try to parse this and try to fetch data-text value, i get 'abcdef' with spaces/carriage return/newline characters in beg and end. Does parsing does not take of indenting spaces? Following is the parsing snippet (ref from net) dom = parseString(data) clipTag = dom.getElementsByTagName('clipdata')[0].toxml() clipData=clipTag.replace('<clipdata>','').replace('</clipdata>','') Kindly suggest.

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• downloading full page text from a web domain

  - by user362808

  Howdy, folks! First time here -- thought I'd field a question on behalf of a coworker. Somebody in my lab is doing a content analysis (e.g. reading an article or transcript line by line and identifying relevant themes) of the web presences of various privatized neuroimaging centers (e.g. http://www.canmagnetic.com/). She's been c/ping entire site maps by hand, and I know I could slap something together with Python to follow links and dump full text (with line numbers) for her, but I've never actually done anything quite like this. Any ideas for how I'd get started? Cheers, -alex

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• problem in extracting the data from text file

  - by parijat24

  hello , i am new to python , and I want to extract the data from this format FBpp0143497 5 151 5 157 PF00339.22 Arrestin_N Domain 1 135 149 83.4 1.1e-23 1 CL0135 FBpp0143497 183 323 183 324 PF02752.15 Arrestin_C Domain 1 137 138 58.5 6e-16 1 CL0135 FBpp0131987 60 280 51 280 PF00089.19 Trypsin Domain 14 219 219 127.7 3.7e-37 1 CL0124 to this format FBpp0143497 5 151 Arrestin_N 1.1e-23 FBpp0143497 183 323 Arrestin_C 6e-16 I have written code in hope that it works but it does not work , please help! file = open('/ddfs/user/data/k/ktrip_01/hmm.txt','r') rec = file.read() for line in rec : field = line.split("\t") print field print field[:] print '>',field[0] print field[1], field[2], field[6], field[12] the hmmtext file is FBpp0143497 5 151 5 157 PF00339.22 Arrestin_N Domain 1 135 149 83.4 1.1e-23 1 CL0135 FBpp0143497 183 323 183 324 PF02752.15 Arrestin_C Domain 1 137 138 58.5 6e-16 1 CL0135 FBpp0131987 60 280 51 280 PF00089.19 Trypsin Domain 14 219 219 127.7 3.7e-37 1 CL0124

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• Run command with no terminal output

  - by Insomaniacal

  Hello, I've searched around online, but can't find the answer to my question. What I want to do is run a command in pythong, using the subprocess module, and store the output in a variable. However, I do not want the command's output to be printed to the terminal. For this code: def storels(): a = subprocess.Popen("ls",shell=True) storels() I get the directory listing in the terminal, instead of having it stored in a. I've also tried def storels(): subprocess.Popen("ls > tmp",shell=True) a = open("./tmp") [Rest of Code] storels() This also prints the output of ls to my terminal. I've even tried this command with the somewhat dated os.system method, since running "ls tmp" in the terminal doesn't print ls to the terminal at all, but stores it in tmp. However, the same thing happens. I'm using python 2.6. Any suggestions? Thanks in advance!

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