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• Multiple calls to /dev/stdin using python subprocess (*nix)

  - by Alex Leach

  Hi, I have a python subprocess call which I would like to link up to three pipes (two standard in and one standard out). I know that there is only one /dev/stdin, but there's all those other devices in /dev I don't know about, and don't know of any python os, sys or subprocess modules that will utilise them in a manner which allows me to give the device path to subprocess.Popen. The reason I ask is because I would like to pipe information from a mysql database or tar archive rather than a directory structure I currently have which has 28,000 directories in. The directory names alone uses a LOT of space! The alternative is to tar / gunzip the entire directory structure and manoeuvre through the compressed archive. With either solution, mysql or tar, I would still like to have two pipes into subprocess.Popen and one out, so that I can bypass the HDD. Any need for an example??

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• Fastest Way to generate 1,000,000+ random numbers in python

  - by Sandro

  I am currently writing an app in python that needs to generate large amount of random numbers, FAST. Currently I have a scheme going that uses numpy to generate all of the numbers in a giant batch (about ~500,000 at a time). While this seems to be faster than python's implementation. I still need it to go faster. Any ideas? I'm open to writing it in C and embedding it in the program or doing w/e it takes. Constraints on the random numbers: A Set of numbers 7 numbers that can all have different bounds: eg: [0-X1, 0-X2, 0-X3, 0-X4, 0-X5, 0-X6, 0-X7] Currently I am generating a list of 7 numbers with random values from [0-1) then multiplying by [X1..X7] A Set of 13 numbers that all add up to 1 Currently just generating 13 numbers then dividing by their sum Any ideas? Would pre calculating these numbers and storing them in a file make this faster? Thanks!

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• Forced naming of parameters in python

  - by Mark Mayo

  In python you may have a function definition: def info(object, spacing=10, collapse=1) which could be called in any of the following ways: info(odbchelper) info(odbchelper, 12) info(odbchelper, collapse=0) info(spacing=15, object=odbchelper) thanks to python's allowing of any-order arguments, so long as they're named. The problem we're having is as some of our larger functions grow, people might be adding parameters between spacing and collapse, meaning that the wrong values may be going to parameters that aren't named. In addition sometimes it's not always clear as to what needs to go in. We're after a way to force people to name certain parameters - not just a coding standard, but ideally a flag or pydev plugin? so that in the above 4 examples, only the last would pass the check as all the parameters are named. Odds are we'll only turn it on for certain functions, but any suggestions as to how to implement this - or if it's even possible would be appreciated.

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• Google MAIL not arriving - relay not allowed

  - by renevdkooi

  I have a server with sendmail, hosting my domain mind-zone.nl, i changed the MX records to point to the server. When I use Hotmail or any other client the email arrives and everything is fine. ONLY mail from GMAIL server is bounced and gmail returns "relay denied". I have set all the virtual server host settings etc, from command line I can send mails as well, hotmail works, etc. Just not gmail. The strange thing is, this is what gmail returns: Look at the lower part: "Received by" it returns some IP address which is not mine and has absolutely nothing with my domain. While when I do a NSLOOKUP and change to google's DNS server it will state that the IP Address for my domain is correctly pointing at my server. Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1: Relay access denied (state 14). ----- Original message ----- MIME-Version: 1.0 Received: by 10.14.37.138 with SMTP id y10mr3421504eea.43.1297665573901; Sun, 13 Feb 2011 22:39:33 -0800 (PST) Received: by 10.14.29.75 with HTTP; Sun, 13 Feb 2011 22:39:33 -0800 (PST)

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• Check if a MediaWiki page exists (Python)

  - by compie

  I'm working on a Python script that transforms this: foo bar Into this: [[Component foo]] [[bar]] The script checks (per input line) if the page "Component foo" exists. If it exists then a link to that page is created, if it doesn't exist then a direct link is created. The problem is that I need a quick & cheap way to check if a lot of wiki pages exist.I don't want to (try to) download all the 'Component' pages. I already figured out a fast way to do this by hand: Edit a new wiki page. paste all the 'component' links into the page, press preview, and then save the resulting preview HTML page. The resulting HTML file contains a different link for existing pages than for non-existing pages. So to rephrase my question: How can I save a mediawiki preview page in Python?

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• App.config path not correctly interpreted by ASP.NET Application

  - by seragu05

  Hello everyone ! I'm working on a very old project (2000) in VB6 which was "modernized" and upgraded to VB.NET 3.5. I've centralized every old INI configuration file into one MainApp.config, which is referenced by the app.config of every component. There's an VB ASP.NET website in the solution, which uses DLL components, which are looking into app.config for parameters like, say, error log directory, etc. I've deployed the site on my dev. server (Windows 2008 Server w/ IIS 7.0) into the D:\WebSite\ directory. Problem: When running the site, an error occurs. A DLL is looking into app.config for the parameter RepertoireErreur which has the value .\Erreurs\ Instead of returning D:\WebSite\Erreurs\ it returns c:\windows\system32\inetsrv\.\Erreurs\ which doesn't contain the Erreurs directory. Boom. Error. Does anyone have ever encountered the same problem ? Is there a solution ? Thanks,

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• Basic Python While loop compound conditional evaluation

  - by dbjohn

  In Python IDLE Shell it seems I cannot use a compound conditional expression and a while loop. I tried it within brackets too. k=0 m=0 while k<10 & m<10: print k k +=1 m+=1 If I write while k<10: print k k+=1 This does work. Is there a way I could achieve the first block of code with the "and" operator. I have done it in Java. Do I just need to put together "if" statements to achieve the same functionality in Python?

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• Python/Tkinter make a custom window

  - by user1435947

  I want to make a window without the top taskbar (that is movable), so there is only thin outline around the GUI box. I also want to add my own 'X' to the box. import Tkinter class Application(Frame): def __init__(self, master=None): Frame.__init__(self, master) self.parent = master ............ def main(): root = Tk() root.attributes('-fullscreen', True) root.geometry('500x250+500+200') app = Application(root) app.parent.configure(background = 'gray32') root.resizable(width=FALSE, height=FALSE) app.mainloop() main() I tried forcing the box to resize after going into fullscreen to remove the taskbar, though box is no longer movable. Any suggestions? [I have seen this thread: Python/Tkinter: Removing/disabling a resizable window's maximize button under Windows The -toolwindow attribute didn't work for me, maybe because I use linux...]

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• Python text file processing speed issues

  - by Anonymouslemming

  Hi all, I'm having a problem with processing a largeish file in Python. All I'm doing is f = gzip.open(pathToLog, 'r') for line in f: counter = counter + 1 if (counter % 1000000 == 0): print counter f.close This takes around 10m25s just to open the file, read the lines and increment this counter. In perl, dealing with the same file and doing quite a bit more (some regular expression stuff), the whole process takes around 1m17s. Perl Code: open(LOG, "/bin/zcat $logfile |") or die "Cannot read $logfile: $!\n"; while (<LOG>) { if (m/.*\[svc-\w+\].*login result: Successful\.$/) { $_ =~ s/some regex here/$1,$2,$3,$4/; push @an_array, $_ } } close LOG; Can anyone advise what I can do to make the Python solution run at a similar speed to the Perl solution? I've tried just uncompressing the file and dealing with it using open instead of gzip.open, but that made a very small difference to the overall time.

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• Porting library from Java to Python

  - by Mike Griffith

  I'm about to port a smallish library from Java to Python and wanted some advice (smallish ~ a few thousand lines of code). I've studied the Java code a little, and noticed some design patterns that are common in both languages. However, there were definitely some Java-only idioms (singletons, etc) present that are generally not-well-received in Python-world. I know at least one tool (j2py) exists that will turn a .java file into a .py file by walking the AST. Some initial experimentation yielded less than favorable results. Should I even be considering using an automated tool to generate some code, or are the languages different enough that any tool would create enough re-work to have justified writing from scratch? If tools aren't the devil, are there any besides j2py that can at least handle same-project import management? I don't expect any tool to match 3rd party libraries from one language to a substitute in another.

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• Creating an interface and swappable implementations in python

  - by Blankman

  Hi, Would it be possible to create a class interface in python and various implementations of the interface. Example: I want to create a class for pop3 access (and all methods etc.). If I go with a commercial component, I want to wrap it to adhere to a contract. In the future, if I want to use another component or code my own, I want to be able to swap things out and not have things very tightly coupled. Possible? I'm new to python.

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• Installing Djnajo/Python on IIS6

  - by Sohrab Hejazi

  We are currently installing the latest version of Django and Python on IIS6. We have followed the instructions on the following site: http://code.djangoproject.com/wiki/DjangoOnWindowsWithIISAndSQLServer We are receiving a 403 error when trying to access our Django application via the IIS server. We have verified the python installation on IIS6 and it is working property. We have also verified the Django installation. Our application runs fine under the built-in Django server, but we are having difficulties getting it to run under IIS. We presume we could be getting errors from "Linking Django to PyISAPIe" section of the instructions provided on the link above. Thank.

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• Tabulated log file format with the python logging system

  - by yorjo

  Hi everybody, I'm using the python logging module with the "native" configuration file support (config.fileconfig) as describe in the documentation here : http://docs.python.org/library/logging.html (see the logging.conf file) I was wondering if it's possible to supply a tabulated data format in the configuration file? The sample configuration file is the following: [formatter_simpleFormatter] format=%(asctime)s - %(name)s - %(levelname)s - %(message)s I though that using the \t in the format would be enough but it doesn't. format=%(asctime)s\t%(name)s\t%(levelname)s\t%(message)s\t If I do so it print \t in the result. I tried a couple of thing without success. I suppose it's really easy to do but I don't find it! How can I do that?

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• How to Implement Binary Tree in Python

  - by Jack

  Which is the best data structure that can be used to implement Binary Tree in Python?

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• Python: Control timeout length

  - by skylarking

  I have code similar to the following running in a script: try: s = ftplib.FTP('xxx.xxx.xxx.xxx','username','password') except: print ('Could not contact FTP serer') sys.exit() IF the FTP site is inaccessible, the script almost seems to 'hang' ... It is taking about 75 seconds on average before sys.exit() appears to be called... I know the 75 seconds is probably very subjective, and dependent on the system this runs on...but is there a way to have python just try this once, and if unsucessful, to exit immediately? The platform I am using for this is Mac OS X 10.5/python 2.5.1.

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• Alternative to "assign to a function call" in a python

  - by Pythonista's Apprentice

  I'm trying to solve this newbie puzzle: I've created this function: def bucket_loop(htable, key): bucket = hashtable_get_bucket(htable, key) for entry in bucket: if entry[0] == key: return entry[1] else: return None And I have to call it in two other functions (bellow) in the following way: to change the value of the element entry[1] or to append to this list (entry) a new element. But I can't do that calling the function bucket_loop the way I did because "you can't assign to function call" (assigning to a function call is illegal in Python). What is the alternative (most similar to the code I wrote) to do this (bucket_loop(htable, key) = value and hashtable_get_bucket(htable, key).append([key, value]))? def hashtable_update(htable, key, value): if bucket_loop(htable, key) != None: bucket_loop(htable, key) = value else: hashtable_get_bucket(htable, key).append([key, value]) def hashtable_lookup(htable, key): return bucket_loop(htable, key) Thanks, in advance, for any help! This is the rest of the code to make this script works: def make_hashtable(size): table = [] for unused in range(0, size): table.append([]) return table def hash_string(s, size): h = 0 for c in s: h = h + ord(c) return h % size def hashtable_get_bucket(htable, key): return htable[hash_string(key, len(htable))] Similar question (but didn't help me): Python: Cannot Assign Function Call

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• app.config and 64-bit machines

  - by Dale Lutes

  I have an app that works fine on 32-bit systems, but fails on XP 64 bit systems. I've tracked it down to the connection string defined in my app.config thus: <connectionStrings> <clear/> <add name="IFDSConnectionString" connectionString="Data Source=fdsdata;Initial Catalog=IFDS; Trusted_Connection=true;Connect Timeout=0" providerName="System.Data.SqlClient" /> </connectionStrings> When I try to reference it in code, I find that the ConfigurationManager.ConnectionStrings collection only contains the LocalSqlServer connection string from the machine.config file and not my custom string. Another oddity is that it works fine when I run the app out of Visual Studio. It is only when I run out of the release folder that the connection string does not get defined. The application's .exe.config file is there in the release folder along with the .exe file and is up to date.

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• sqlite & python - only pulls the first result

  - by pencilNero

  This is pretty strange (admitedly, this is my first attempt with python / sqlite), but I can seem to get all of the rows if I do a fetchAll(), but other than that - no matter what I try, always ends up in the db only returning the first row - the second iteration stops because a null is returned. Wondering if there is something wrong with how I am coding this up in python? The db seems ok.. con = sqlite3.connect('backup.db') con.row_factory = sqlite3.Row cur = con.cursor() cur.execute('select * from tb1;') for row in cur: try: # row = dataCur.fetchone() #if row == None: break print type(row) print ' Starting on: %i' % row[0] cleaner = Cleaner(scripts=True, remove_tags=['img'], embedded=True) try: cleaned = cleaner.clean_html(row[2]) #data stored in second col cur.execute('update tb1 set data = ? where id = ?;', (cleaned, row[0])) except AttributeError: print 'Attribute error' print ' Ended on: %i' % row[0] except IOError: print 'IOexception'

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• Hashing a python function to regenerate output when the function is modified

  - by Seth Johnson

  I have a python function that has a deterministic result. It takes a long time to run and generates a large output: def time_consuming_function(): # lots_of_computing_time to come up with the_result return the_result I modify time_consuming_function from time to time, but I would like to avoid having it run again while it's unchanged. [time_consuming_function only depends on functions that are immutable for the purposes considered here; i.e. it might have functions from Python libraries but not from other pieces of my code that I'd change.] The solution that suggests itself to me is to cache the output and also cache some "hash" of the function. If the hash changes, the function will have been modified, and we have to re-generate the output. Is this possible or ridiculous? Updated: based on the answers, it looks like what I want to do is to "memoize" time_consuming_function, except instead of (or in addition to) arguments passed into an invariant function, I want to account for a function that itself will change.

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• App Engine - Query using a class member as parameter

  - by Zach

  I have a simple class, relevant details below: @PersistenceCapable(identityType = IdentityType.APPLICATION) public class SimpleCategory implements Serializable{ ... public static enum type{ Course, Category, Cuisine } @Persistent public type t; ... } I am attempting to query all SimpleCategory objects of the same type. public SimpleCategory[] getCategories(SimpleCategory.type type) { PersistenceManager pm = PMF.get().getPersistenceManager(); try{ Query q = pm.newQuery(SimpleCategory.class); q.setFilter("t == categoryType"); q.declareParameters("SimpleCategory.type categoryType"); List<SimpleCategory> cats = (List<SimpleCategory>) q.execute(type); ... } This results in a ClassNotResolvedException for SimpleCategory.type. The google hits I've found so far recommended to: Use query.declareImports to specify the class i.e. q.declareImports("com.test.zach.SimpleCategory.type"); Specify the fully qualified name of SimpleCategory in declareParameters Neither of these suggestions has worked. By removing .type and recompiling, I can verify that declareParameters can see SimpleCategory just fine, it simply cannot see the SimpleCategory.type, despite the fact that the remainder of the method has full visibility to it. What am I missing?

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• define global in a python module from C api

  - by wiso

  Sorry for the trivial question, but I can't find this infomation from the manual. I am developping a module for python using C api; how can I create a variabile that is seen as global from python? For example if my module is module I want to create a variable g that do this job: import module print module.g in particular g is an integer. Solution from Alex Martelli PyObject *m = Py_InitModule("mymodule", mymoduleMethods); PyObject *v = PyLong_FromLong((long) 23); PyObject_SetAttrString(m, "L", v); Py_DECREF(v);

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• Optimization Techniques in Python

  - by fear-matrix

  Recently i have developed a billing application for my company with Python/Django. For few months everything was fine but now i am observing that the performance is dropping because of more and more users using that applications. Now the problem is that the application is now very critical for the finance team. Now the finance team are after my life for sorting out the performance issue. I have no other option but to find a way to increase the performance of the billing application. So do you guys know any performance optimization techniques in python that will really help me with the scalability issue

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• Method not found: 'Void Google.Apis.Util.Store.FileDataStore..ctor(System.String)'

  - by user3732193

  I've been stuck at this for days now. I copied the exact codes from google api samples to upload files to Google Drive. Here is the code UserCredential credential = GoogleWebAuthorizationBroker.AuthorizeAsync( new ClientSecrets { ClientId = ClientId, ClientSecret = ClientSecret, }, new[] { DriveService.Scope.Drive, DriveService.Scope.DriveFile }, "user", CancellationToken.None, new FileDataStore("MyStore")).Result; But it would throw an exception at runtime: Method not found: 'Void Google.Apis.Util.Store.FileDataStore..ctor(System.String)'. I already added the necessary Google Api dlls. Or if anyone could suggest a better code for uploading files to Google Drive in a website which implements Server-Side Authorization. Any help would be greatly appreciated. UPDATE: I changed my code to this var token = new TokenResponse { RefreshToken = "1/6hnki1x0xOMU4tr5YXNsLgutzbTcRK1M-QOTEuRVxL4" }; var credentials = new UserCredential(new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer { ClientSecrets = new ClientSecrets { ClientId = ClientId, ClientSecret = ClientSecret }, Scopes = new[] { DriveService.Scope.Drive, DriveService.Scope.DriveFile } }), "user", token); But it also throws an exception: Method not found: 'Void Google.Apis.Auth.OAuth2.Flows.GoogleAuthorizationCodeFlow..ctor(Initializer). Is the problem with the dlls?

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• Run script from python(or perl) through proxy

  - by nucleartux

  Howto to run program through proxy (with auth.) from python(or perl)?

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• can i just broadcast a specific message in my own network in python

  - by sia

  i just want to broadcast a udp message on a specific port in my network, so how can i broadcast a message in python?

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