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• Lost in UTF-8 hell. (Django and Python)

  - by user140314

  I am working through the Django RSS reader project here. The RSS feed will read something like "OKLAHOMA CITY (AP) — James Harden let". The RSS feed's encoding reads encoding="UTF-8" so I believe I am passing utf-8 to markdown in the code snippet below. The em dash is where it chokes. I get the Django error of "'ascii' codec can't encode character u'\u2014' in position 109: ordinal not in range(128)" which is an UnicodeEncodeError. In the variables being passed I see "OKLAHOMA CITY (AP) \u2014 James Harden". The code line that is not working is: content = content.encode(parsed_feed.encoding, "xmlcharrefreplace") I am using markdown 2.0, django 1.1, and python 2.4. What is the magic sequence of encoding and decoding that I need to do to make this work? Thanks.

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• How to catch FTP errors? e.g., socket.error: [Errno 10060]

  - by Johnson

  I'm using the ftplib module to upload files: files = [ a.txt , b.txt , c.txt ] s = ftplib.FTP(ftp_server , ftp_user , ftp_pw) # Connect to FTP for i in range(len(files)): f = open(files[i], 'rb') stor = 'stor ' + files[i] s.storbinary(stor, f) f.close() # close file s.quit() # close ftp How do I catch the following error? socket.error: [Errno 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond And what other errors are common when using the FTP module that I should also catch? Thanks for any help or pointers.

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• Select from mysql by day with different timezones (php)

  - by Adam

  I'm storing leads in a database, and each lead has a datetime field with a PST timezone based date & time. I want my user to be able to display all leads from a certain date (e.g. today, yseterday), and choose the timezone. E.g. if I want to see all leads that were generated yesterday in EST timezone, I need to first convert (or read) all the datetime values to EST, and then only select those who are in the right range (yesterday). What would be the best way to do that?

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• Finding gaps (missing records) in database records using SQL

  - by Tony_Henrich

  I have a table with records for every consecutive hour. Each hour has some value. I want a T-SQL query to retrieve the missing records (missing hours, the gaps). So for the DDL below, I should get a record for missing hour 04/01/2010 02:00 AM (assuming date range is between the first and last record). Using SQL Server 2005. Prefer a set based query. DDL: CREATE TABLE [Readings]( [StartDate] [datetime] NOT NULL, [SomeValue] [int] NOT NULL ) INSERT INTO [Readings]([StartDate], [SomeValue]) SELECT '20100401 00:00:00.000', 2 UNION ALL SELECT '20100401 01:00:00.000', 3 UNION ALL SELECT '20100401 03:00:00.000', 45

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• Should I use uint in C# for values that can't be negative?

  - by Johannes Rössel

  I have just tried implementing a class where numerous length/count properties, etc. are uint instead of int. However, while doing so I noticed that it's actually painful to do so, like as if no one actually wants to do that. Nearly everything that hands out an integral type returns an int, therefore requiring casts in several points. I wanted to construct a StringBuffer with its buffer length defaulted to one of the fields in that class. Requires a cast too. So I wondered whether I should just revert to int here. I'm certainly not using the entire range anyway. I just thought since what I'm dealing with there simply can't be negative (if it was, it'd be an error) it'd be a nice idea to actually use uint. P.S.: I saw this question and this at least explains why the framework itself always uses int but even in own code it's actually cumbersome to stick to uint which makes me think it apparently isn't really wanted.

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• Python thread pool similar to the multiprocessing Pool?

  - by Martin

  Is there a Pool class for worker threads, similar to the multiprocessing module's Pool class? I like for example the easy way to parallelize a map function def long_running_func(p): c_func_no_gil(p) p = multiprocessing.Pool(4) xs = p.map(long_running_func, range(100)) however I would like to do it without the overhead of creating new processes. I know about the GIL. However, in my usecase, the function will be an IO-bound C function for which the python wrapper will release the GIL before the actual function call. Do I have to write my own threading pool?

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• Text encoding problem between NSImage, NSData, and NSXMLDocument

  - by andyvn22

  I'm attempting to take an NSImage and convert it to a string which I can write in an XML document. My current attempt looks something like this: [xmlDocument setCharacterEncoding: @"US-ASCII"]; NSData* data = [image TIFFRepresentation]; NSString* string = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; //Put string inside of NSXMLElement, write out NSXMLDocument. Reading back in looks something like this: NSXMLDocument* newXMLDocument = [[NSXMLDocument alloc] initWithData:data options:0 error:outError]; //Here's where it fails. I get: //Error Domain=NSXMLParserErrorDomain Code=9 UserInfo=0x100195310 "Line 7: Char 0x0 out of allowed range" I assume I'm missing something basic. What's up with this encoding issue?

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• PyQt4 Move QTableWidget row with widgets

  - by Guard

  I have the following method in my PyQt4 app. r2 is the number of row to move, and r1 is the position where it should be moved. To clarify: the table is filled with cellWidgets, not widgetItems. def move_row(self, r1, r2): tt = self.tableWidget tt.insertRow(r1) for c in range(tt.columnCount()): tt.setCellWidget(r1, c, tt.cellWidget(r2 + 1, c)) tt.removeRow(r2 + 1) # <--- ??? If I comment out the last line, it behaves as expected: the new row is inserted at position r1, it is filled with widgets from r2 (now it's r2+1), and the r2+1 row is empty. If I even hide this row, it behaves well, though it is not what I want (I have the rows numbered, and I don't want this hidden row to occupy the number). But if I remove the row, the widgets initially owned by it disappear. Looks like their ownership is taken on first placement, and is not changed after the move. Any ideas?

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• Do you know a good and efficient FFT?

  - by yan bellavance

  Hi, I am trying to find a very fast and efficient Fourier transform (FFT). Does anyone know of any good ones. I need to run it on the iPhone so it must not be intensive. Instead, maybe you know of one that is wavelet like, i need frequency resolution but only a narrow band (vocal audio range up to 10khz max...even 10Khz might be too high). Im thinking also of truncating this FFT to keep the frequency resolution while eliminating the unwanted frequency band. This is for an iphone ...I have taken a look at the FFT in Aurio touch but it seems this is an int FFT but my app uses floats.....would it give a big performance increase to try and adapt program to an int FFT or not(which i really dont feel like doing...plus aurio touch uses a radix 2 FFT which is not that great).

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• Capture Backspace , is this a OK solution?

  - by f0rz

  Hello, I having a hard time to capture the backspace button in a UITextView. I am trying to capture it in the method - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text I thought it was ok to do like this. if([text isEqualToString:@"\b") { // code ... } But for some reason, when backspace is pressed 'text' is empty. I know I can compare lenght of the UITextView but it isnt what I want to achieve. So I found a solution to this. If I look at '[text lenght]' every key on the defaultkeyboard returns 0 . Every key excepts the backspace wich is 0. In that way i know when backspace is pressed. I do this check. if([text lenght] == 0) { // BACKSPACE PRESSED   } What is your opinion about this? -or can I do it in a better way? Regards. - Martin

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• twitter api is throwing exception "# is not a valid value for Int32" while getting freinds

  - by vakas

  i am using the api twitterizer.framework while getting the friends of a user the api starts throwing this error. "# is not a valid value for Int32. --- System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: startIndex at System.ParseNumbers.StringToInt(String s, Int32 radix, Int32 flags, Int32* currPos) at System.Convert.ToInt32(String value, Int32 fromBase) at System.ComponentModel.Int32Converter.FromString(String value, Int32 radix) at System.ComponentModel.BaseNumberConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) --- End of inner exception stack trace --- at System.ComponentModel.BaseNumberConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) at System.ComponentModel.TypeConverter.ConvertFromString(ITypeDescriptorContext context, CultureInfo culture, String text) at System.Drawing.ColorConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) at System.ComponentModel.TypeConverter.ConvertFromString(String text) at System.Drawing.ColorTranslator.FromHtml(String htmlColor) at Twitterizer.Framework.TwitterRequest.ParseUserNode(XmlNode element) in C:\Projects\twitterizer\Twiterizer.Framework\TwitterRequest.cs:line 514 at Twitterizer.Framework.TwitterRequest.ParseUsers(XmlElement element) in C:\Projects\twitterizer\Twiterizer.Framework\TwitterRequest.cs:line 483 at Twitterizer.Framework.TwitterRequest.ParseResponseData(TwitterRequestData data) in C:\Projects\twitterizer\Twiterizer.Framework\TwitterRequest.cs:line 305" how to handle this?

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• Check if the integer in a list is not duplicated, and sequential

  - by prosseek

  testGroupList is a list of integer. I need to check the numbers in testGroupList is sequential (i.e, 1-2-3-4...) and not duplicate numbers. Ignore the negative integer. I implemented it as follows, and it's pretty ugly. Is there any clever way to do this? buff = filter(lambda x: x 0, testGroupList) maxval = max(buff) for i in range(maxval): id = i+1 val = buff.count(id) if val == 1: print id, elif val = 2: print "(Test Group %d duplicated %d times)" % (id, val), elif val == 0: print "(Test Group %d missing)" % id,

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• C# int to byte[]

  - by Petoj

  If I need to convert an int to byte[] I could use Bitconvert.GetBytes(). But if I should follow this: An XDR signed integer is a 32-bit datum that encodes an integer in the range [-2147483648,2147483647]. The integer is represented in two's complement notation. The most and least significant bytes are 0 and 3, respectively. Integers are declared as follows: Taken from RFC1014 3.2. What method should I use then if there is no method to do this? How would it look like if you write your own? I don't understand the text 100% so I can't implement it on my own.

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• Python: Retrieve Image from MSSQL

  - by KoRkOnY

  Dear All, I'm working on a Python project that retrieves an image from MSSQL. My code is able to retrieve the images successfully but with a fixed size of 63KB. if the image is greater than that size, it just brings the first 63KB from the image! The following is my code: #!/usr/bin/python import _mssql mssql=_mssql.connect('<ServerIP>','<UserID>','<Password>') mssql.select_db('<Database>') x=1 while x==1: query="select TOP 1 * from table;" if mssql.query(query): rows=mssql.fetch_array() rowNumbers = rows[0][1] #print "Number of rows fetched: " + str(rowNumbers) for row in rows: for i in range(rowNumbers): FILE=open('/home/images/' + str(row[2][i][1]) + '-' + str(row[2][i][2]).strip() + ' (' + str(row[2][i][0]) + ').jpg','wb') FILE.write(row[2][i][4]) FILE.close() print 'Successfully downloaded image: ' + str(row[2][i][0]) + '\t' + str(row[2][i][2]).strip() + '\t' + str(row[2][i][1]) else: print mssql.errmsg() print mssql.stdmsg() mssql.close()

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• Java playback of 24 bit audio is incorrect

  - by Paul Hampson

  I am using the javax sound API to implement a simple console playback program based on http://www.jsresources.org/examples/AudioPlayer.html. Having tested it using a 24 bit ramp file (each sample is the last sample plus 1 over the full 24 bit range) it is evident that something odd is happening during playback. The recorded output is not the contents of the file (I have a digital loopback to verify this). It seems to be misinterpreting the samples in some way that causes the left channel to look like it is having some gain applied to it and the right channel looks like it is being attenuated. I have looked into whether the PAN and BALANCE controls need setting but these aren't available and I have checked the windows xp sound system settings. Any other form of playback of this ramp file is fine. If I do the same test with a 16bit file it performs correctly with no corruption of the stream. So does anyone have any idea why the Java Sound API is modifying my audio stream?

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• Hyphenate a random string to an exact format

  - by chrissygormley

  Hello, I am creating a random ID using the below code: from random import * import string # The characters to make up the random password chars = string.ascii_letters + string.digits def random_password(): return "".join(choice(chars) for x in range(32)) This will output something like: 60ff612332b741508bc4432e34ec1d3e I would like the format to be in this format: 60ff6123-32b7-4150-8bc4-432e34ec1d3e I was looking at the .split() method but can't see how to do this with a random id, also the hyphen's must be at these places so splitting them by a certain amount of digits is out. I'm asking is there a way to split these random id's by 8 number's then 4 etc. Thanks

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• Create WPF TextBox that accepts only numbers

  - by Elad

  I would like to create a TextBox that only accepts numeric values, in a specific range. What is the best way to implement such TextBox? I thought about deriving TextBox and to override the validation and coercion of the TextProperty. However, I am not sure how to do this, and I understand that deriving WPF control is generally not recommended. Edit: What I needed was a very basic textbox that filters out all key presses which are not digits. The easiest way to achieve it is to handle the TextBox.PreviewTextInput event: private void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e) { int result; if (!validateStringAsNumber(e.Text,out result,false)) { e.Handled = true; } } (validateStringAsNumber is my function that primarily use Int.TryParse) Some of the suggested solutions are probably better, but for the simple functionality I needed this solution is the easiest and quickest to implement while sufficient for my needs.

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• Python encoding for pipe.communicate

  - by Brian M. Hunt

  I'm calling pipe.communicate from Python's subprocess module from Python 2.6. I get the following error from this code: from subprocess import Popen pipe = Popen(cwd) pipe.communicate( data ) For an arbitrary cwd, and where data that contains unicode (specifically 0xE9): Exec. exception: 'ascii' codec can't encode character u'\xe9' in position 507: ordinal not in range(128) Traceback (most recent call last): ... stdout, stderr = pipe.communicate( data ) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 671, in communicate return self._communicate(input) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 1177, in _communicate bytes_written = os.write(self.stdin.fileno(), chunk) This is happening, I presume, because pipe.communicate() is expecting ASCII encoded string, but data is unicode. Is this the problem I'm encountering, and i sthere a way to pass unicode to pipe.communicate()? Thank you for reading! Brian

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• I need free index/fund/stock end of day quotes in CSV

  - by Janne Mikkola

  Hello, I need (free or cheap) source for end of day stock/mutual funds/index values. Major world indexes & European stocks are primary intrest. I keep seeing that yahoo/ google/ MS offer this data, yet I cant find HOWTO doc (or similar) on getting the data. Reuters is an option - ~$300/month puts it out of my range. Sample of what I am looking for: WMX.IDX,20100326,54.49,54.6,54.17,54.41,0 XAH.IDX,20100326,52.39,52.77,52.33,52.54,0 XAL.IDX,20100326,37.34,38.4,37.34,37.59,0 XAO.IDX,20100326,4896.2998,4905.2002,4848.2998,4905.2002,0 I wish to get this data into txt file in an automated manner. My platform is Linux, (I also have pc with windows & emulator in for win in linux so windows is an option) http://www.eoddata.com/ is best site I have found so far. This is quite good yet I desire more info on european finances. Please advice! Sincerely, Janne

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• Android question. Is there a link to a simple example of changing the screen brightness for an activ

  - by John

  There are apparently at least three different techniques for changing screen brightness in the Android OS. Two of them no longer work post-cupcake and the third accepted technique evidently has a bug. I would like to increase screen brightness at the start of a one-view activity then turn the brightness back to the user setting at the end of the activity. No buttons, no second view or second activity. Just a maxed brightness at start and a return to original brightness setting at the end of the activity. The examples of the current technique using WindowManager.LayoutParams that I have located range from 2 lines of code WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.screenBrightness = 100 / 100.0f; getWindow().setAttributes(lp); to several pages of source code and numerous activities. Is there a simple example of maxing the screen brightness at start that someone can provide a link to? Thank you for reading my question.

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• Is it possible to detect a scrollbar release event in GWT?

  - by Keith

  I'm building a GWT app where I want to be able to detect when a user releases a scroll bar on one of my ScrollPanels. My use case is that the horizontal scroll bar represents time. Since it's impossible to represent the full range of scrollable time I want to just represent a small window of time with the scroll bar. When the user moves and releases the scroll bar I want to do a smooth recentering where the new center is the release point. I can work out how to do this by building a custom scroll bar widget, but I wanted to check if I was missing some way to do it using a "native" scroll bar first.

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• software/languages for online structured data collection from (human) clients

  - by Ben

  I need to develop a web interface to collect and validate a range of data from many of my organization's clients. This isn't a single form, but a collection of forms with interdependencies (i.e., field X on form Y is needed if field A was equal to C on form B), and variable length lists (please provide the details for all Xs in your possession). I had a look at the marketing on Microsoft InfoPath and Adobe LiveCycle, but I get the impression that they're principally electronic forms solutions rather than data collection tools. (e.g., If a user has entered their address once, they should never have to see it on a form again). Any suggestions of good tools, applications or domain-specific languages?

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• Double linking array in Python

  - by cdecker

  Since I'm pretty new this question'll certainly sound stupid but I have no idea about how to approach this. I'm trying take a list of nodes and for each of the nodes I want to create an array of predecessors and successors in the ordered array of all nodes. Currently my code looks like this: nodes = self.peers.keys() nodes.sort() peers = {} numPeers = len(nodes) for i in nodes: peers[i] = [self.coordinator] for i in range(0,len(nodes)): peers[nodes[i%numPeers]].append(nodes[(i+1)%numPeers]) peers[nodes[(i+1)%numPeers]].append(nodes[i%numPeers]) # peers[nodes[i%numPeers]].append(nodes[(i+4)%numPeers]) # peers[nodes[(i+4)%numPeers]].append(nodes[i%numPeers]) The last two lines should later be used to create a skip graph, but that's not really important. The problem is that it doesn't really work reliably, sometimes a predecessor or a successor is skipped, and instead the next one is used, and so forth. Is this correct at all or is there a better way to do this? Basically I need to get the array indices with certain offsets from each other. Any ideas?

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• Efficient data structure for fast random access, search, insertion and deletion

  - by Leonel

  I'm looking for a data structure (or structures) that would allow me keep me an ordered list of integers, no duplicates, with indexes and values in the same range. I need four main operations to be efficient, in rough order of importance: taking the value from a given index finding the index of a given value inserting a value at a given index deleting a value at a given index Using an array I have 1 at O(1), but 2 is O(N) and insertion and deletions are expensive (O(N) as well, I believe). A Linked List has O(1) insertion and deletion (once you have the node), but 1 and 2 are O(N) thus negating the gains. I tried keeping two arrays a[index]=value and b[value]=index, which turn 1 and 2 into O(1) but turn 3 and 4 into even more costly operations. Is there a data structure better suited for this?

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• C# ArrayList calling on a constructor class

  - by EvanRyan

  I'm aware that an ArrayList is probably not the way to go with this particular situation, but humor me and help me lose this headache. I have a constructor class like follows: class Peoples { public string LastName; public string FirstName; public Peoples(string lastName, string firstName) { LastName = lastName; FirstName = firstName; } } And I'm trying to build an ArrayList to build a collection by calling on this constructor. However, I can't seem to find a way to build the ArrayList properly when I use this constructor. I have figured it out with an Array, but not an ArrayList. I have been messing with this to try to build my ArrayList: ArrayList people = new ArrayList(); people[0] = new Peoples("Bar", "Foo"); people[1] = new Peoples("Quirk", "Baz"); people[2] = new Peopls("Get", "Gad"); My indexing is apparently out of range according to the exception I get.

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