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• Open/Close database connection in django

  - by mp0int

  I am using Django and Postgresql as my DBMS. I wish to set a setting that enables to enable/disable database connection. When the connection is set to closed (in settings.py) the site will display a message such as "meintanence mode" or something like that. Django will not show any db connection error message (or mail them to admins). It is appreciated if django do not try to connect to the database at all.

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• Skip sanitization for videos in html5lib

  - by pug

  I am using a wmd-editor in django, much like this one in which I am typing. I would like to allow the users to embed videos in it. For that I am using the Markdown video extension here. The problem is that I am also sanitizing user input using html5lib sanitization and it doesn't allow object tags which are required to embed the videos. One solution could be to check the input for urls of well-known video sites and skip the sanitization in those cases. Is there a better solution?

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• XML document being parsed as single element instead of sequence of nodes

  - by Rob Carr

  Given xml that looks like this: <Store> <foo> <book> <isbn>123456</isbn> </book> <title>XYZ</title> <checkout>no</checkout> </foo> <bar> <book> <isbn>7890</isbn> </book> <title>XYZ2</title> <checkout>yes</checkout> </bar> </Store> I am getting this as my parsed xmldoc: >>> from xml.dom import minidom >>> xmldoc = minidom.parse('bar.xml') >>> xmldoc.toxml() u'<?xml version="1.0" ?><Store>\n<foo>\n<book>\n<isbn>123456</isbn>\n</book>\n<t itle>XYZ</title>\n<checkout>no</checkout>\n</foo>\n<bar>\n<book>\n<isbn>7890</is bn>\n</book>\n<title>XYZ2</title>\n<checkout>yes</checkout>\n</bar>\n</Store>' Is there an easy way to pre-process this document so that when it is parsed, it isn't parsed as a single xml element?

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• Introspection of win32com module / pythoncom module

  - by crystal

  Hi, what is the best way to see what all functions that can be performed using pythoncom module? Specifically, i was working with the win32com module to operate upon excel files. I was not able to find introspection for it as we do for the rest of the modules. Can anyone please suggest how can i retrieve this information?

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• how to round_corner a logo without leaving white background(transparent?) with it using pil?

  - by bdictator

  I got a square logo and I need to round_corner it, searched for a while and got the follow code "working": def round_corner_jpg(image, radius): """generate round corner for image""" mask = Image.new('RGB', image.size) #mask = Image.new('RGB', (image.size[0] - radius, image.size[1] - radius)) #mask = Image.new('L', image.size, 255) draw = aggdraw.Draw(mask) brush = aggdraw.Brush('black') width, height = mask.size draw.rectangle((0,0,width,height), aggdraw.Brush('')) #upper-left corner draw.pieslice((0,0,radius*2, radius*2), 90, 180, None, brush) #upper-right corner draw.pieslice((width - radius*2, 0, width, radius*2), 0, 90, None, brush) #bottom-left corner draw.pieslice((0, height - radius * 2, radius*2, height),180, 270, None, brush) #bottom-right corner draw.pieslice((width - radius * 2, height - radius * 2, width, height), 270, 360, None, brush) #center rectangle draw.rectangle((radius, radius, width - radius, height - radius), brush) #four edge rectangle draw.rectangle((radius, 0, width - radius, radius), brush) draw.rectangle((0, radius, radius, height-radius), brush) draw.rectangle((radius, height-radius, width-radius, height), brush) draw.rectangle((width-radius, radius, width, height-radius), brush) draw.flush() del draw return ImageChops.add(mask, image) then I saved the returned image object,however it has white background in it?how can i get rid of the white background? Thanks in advance~

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• How to display total record count against models in django admin

  - by Rog

  Is there a neat way to make the record/object count for a model appear on the main model list in the admin module? I have found techniques for showing counts of related objects within sets in the list_display page (and I can see the total in the pagination section at the bottom of the same), but haven't come across a neat way to show the record count at the model list level.

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• Source for Names to use in web scraping

  - by PyNEwbie

  Can anyone suggest a good source of names that I can use to help analyze some tables on web pages. The first column of the tables I am scraping have names alone, names and titles or just titles. The names can be as varied as John Smith to Vikram Saksena. I have been poking around for a compiled list of words that can be found in proper names.

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• Connect to a running instance of Visual Studio 2003 using COM, build and read output

  - by codeape

  For Visual Studio 6.0, I can connect to a running instance like: o = GetActiveObject("MSDev.Application") What prog ID do I use for Visual Studio 2003? How do I execute a 'Build Solution' once I have the COM object that references the VS2003 instance? How do I get the string contents of the build output window after executing the build solution command? Yes, I am aware that I can build a solution from the command line. But in this case, I need to connect to a running instance of Visual Studio. EDIT: found and submitted an answer, see below.

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• Dynamically expanding Django forms

  - by RexE

  I would like to create a form where a user can enter an arbitrary # of items in separate textboxes. The user could add (and potentially remove) fields as needed. Something like this: I found the following different solutions: http://www.eggdrop.ch/blog/2007/02/15/django-dynamicforms/ http://dewful.com/?p=100 Is there another best practice I might not be aware of?

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• List as a key to a dictionary

  - by williamx

  Let's say I have a list: a = ['apple', 'orange'] and a dictionary: d ={'apple': [2,4], 'carrot': [44,33], 'orange': [345,667]} How can I use the list a as a key to lookup in the dictionary d? I want the result to be written to a comma-separated textfile like this apple, orange 2, 44 4, 33

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• Scipy sparse... arrays?

  - by spitzanator

  Hey, folks. So, I'm doing some Kmeans classification using numpy arrays that are quite sparse-- lots and lots of zeroes. I figured that I'd use scipy's 'sparse' package to reduce the storage overhead, but I'm a little confused about how to create arrays, not matrices. I've gone through this tutorial on how to create sparse matrices: http://www.scipy.org/SciPy_Tutorial#head-c60163f2fd2bab79edd94be43682414f18b90df7 To mimic an array, I just create a 1xN matrix, but as you may guess, Asp.dot(Bsp) doesn't quite work because you can't multiply two 1xN matrices. I'd have to transpose each array to Nx1, and that's pretty lame, since I'd be doing it for every dot-product calculation. Next up, I tried to create an NxN matrix where column 1 == row 1 (such that you can multiply two matrices and just take the top-left corner as the dot product), but that turned out to be really inefficient. I'd love to use scipy's sparse package as a magic replacement for numpy's array(), but as yet, I'm not really sure what to do. Any advice? Thank you very much!

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• How long should it take for someone to be able to type code from memory?

  - by LordSnoutimus

  Hi, I understand that this question could be answered with a simple sentence and that it may be viewed as subjective, however, I am a young student who is interested in pursuing a career in programming and wondered how long it took some of you to get to the level of experience you are now?. I ask this because I am currently working on building an application in Java on the Android platform and it bothers me that I am constantly having to look up how to write a certain section of code in my application such as writing to a database, or how the if loop should be structured. My question really is, how long did it take for you to become experienced enough to actually know exactly how your next line of code was going to look, before you even wrote it?

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• PySide using Style Sheets to change QtoolBox

  - by efi_ex

  I'm Wondering if somebody knows a better reference than the QT one for style sheets. I try to change the background of the content from a QToolBox but background-color only changes the header of the toolbox and the background of the content it reveals is left in a standard color. I then tried to change the bg of QWidget which worked but left me with problems now at Radiobuttons and Checkboxes, i also think changing QWidget isn't a good solution. The first picture is with Qt standard colors (this is a maya tool) the second when i change QWidget http://i.imgur.com/MNlSedx.png?1 http://i.imgur.com/wuplpmw.png?1

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• Jinja2 returns "None" string for Google App Engine models

  - by Brian M. Hunt

  Google App Engine models, likeso: from google.appengine.ext.db import Model class M(): name = db.StringProperty() Then in a Jinja2 template called from a Django view with an in instance of M passed in as m: The name of this M is {{ m.name }}. When m is initialized without name being set, the following is printed: The name of this M is None. The preferable and expected output (and the output when using Django templates) would be/is: The name of this M is . Do you know why this is happening, and how to get the preferred & expected output?

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• How to create a custom admin configuration panel in Django?

  - by Matteo

  Hi, I would like to create a configuration panel for the homepage of the web-app I'm designing with Django. This configuration panel should let me choose some basic options like highlighting some news, setting a showcase banner, and so on. Basically I don't need an app with different rows, but just a panel page with some configuration options. The automatically generated administration area created by Django doesn't seem to handle this feature as far as I can see, so I'm asking you for some directions. Any hint is highly appreciated. Thank you in advance. Matteo

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• How can I prompt for input using Selenium/Webdriver and use the result?

  - by Tempus

  I would like to allow for user input and make some decisions based on it. If I do this: driver.execute_script("prompt('Enter smth','smth')") I get a nice prompt, but I cannot use it's value. Is there any way of showing an input box to the user, and use the value typed there? EDIT: This is my script: from selenium.webdriver import Firefox if __name__ == "__main__": driver = Firefox() driver.execute_script("window.promptResponse=prompt('Enter smth','smth')") a = driver.execute_script("var win = this.browserbot.getUserWindow(); return win.promptResponse") print "got back %s" % a And this exits with the following exception: a = driver.execute_script("var win = this.browserbot.getUserWindow(); return win.promptResponse") File "c:\python26\lib\site-packages\selenium-2.12.1-py2.6.egg\selenium\webdriver\remote\webdriver.py", line 385, in ex ecute_script {'script': script, 'args':converted_args})['value'] File "c:\python26\lib\site-packages\selenium-2.12.1-py2.6.egg\selenium\webdriver\remote\webdriver.py", line 153, in ex ecute self.error_handler.check_response(response) File "c:\python26\lib\site-packages\selenium-2.12.1-py2.6.egg\selenium\webdriver\remote\errorhandler.py", line 110, in check_response if 'message' in value: TypeError: argument of type 'NoneType' is not iterable What am I not doing right?

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• a more pythonic way to express conditionally bounded loop?

  - by msw

  I've got a loop that wants to execute to exhaustion or until some user specified limit is reached. I've got a construct that looks bad yet I can't seem to find a more elegant way to express it; is there one? def ello_bruce(limit=None): for i in xrange(10**5): if predicate(i): if not limit is None: limit -= 1 if limit <= 0: break def predicate(i): # lengthy computation return True Holy nesting! There has to be a better way. For purposes of a working example, xrange is used where I normally have an iterator of finite but unknown length (and predicate sometimes returns False).

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• missing elements from pcap?

  - by Matthew

  When I check the attributes available to the module pcap, I expect to see something like 'DLT_AIRONET_HEADER', 'DLT_APPLE_IP_OVER_IEEE1394', 'DLT_ARCNET', 'DLT_ARCNET_LINUX', 'DLT_ATM_CLIP', 'DLT_ATM_RFC1483', 'DLT_AURORA', 'DLT_AX25', 'DLT_CHAOS', 'DLT_CISCO_IOS', 'DLT_C_HDLC', 'DLT_DOCSIS', 'DLT_ECONET', 'DLT_EN10MB', 'DLT_EN3MB', 'DLT_ENC', 'DLT_FDDI', 'DLT_FRELAY', 'DLT_IEEE802', 'DLT_IEEE802_11', 'DLT_IEEE802_11_RADIO', 'DLT_IEEE802_11_RADIO_AVS', 'DLT_IPFILTER', 'DLT_IP_OVER_FC', 'DLT_JUNIPER_ATM1', 'DLT_JUNIPER_ATM2', 'DLT_JUNIPER_ES', 'DLT_JUNIPER_GGSN', 'DLT_JUNIPER_MFR', 'DLT_JUNIPER_MLFR', 'DLT_JUNIPER_MLPPP', 'DLT_JUNIPER_MONITOR', 'DLT_JUNIPER_SERVICES', 'DLT_LINUX_IRDA', 'DLT_LINUX_SLL', 'DLT_LOOP', 'DLT_LTALK', 'DLT_NULL', 'DLT_PFLOG', 'DLT_PPP', 'DLT_PPP_BSDOS', 'DLT_PPP_ETHER', 'DLT_PPP_SERIAL', 'DLT_PRISM_HEADER', 'DLT_PRONET', 'DLT_RAW', 'DLT_RIO', 'DLT_SLIP', 'DLT_SLIP_BSDOS', 'DLT_SUNATM', 'DLT_SYMANTEC_FIREWALL', 'DLT_TZSP', 'builtins', 'doc', 'file', 'name', '_newclass', '_object', '_pcap', '_swig_getattr', '_swig_setattr', 'aton', 'dltname', 'dltvalue', 'findalldevs', 'lookupdev', 'lookupnet', 'ntoa', 'pcapObject', 'pcapObjectPtr'] With note on pcapObject. However, all I get when running dir(pcap) is ['DLT_ARCNET', 'DLT_AX25', 'DLT_CHAOS', 'DLT_EN10MB', 'DLT_EN3MB', 'DLT_FDDI', 'DLT_IEEE802', 'DLT_LINUX_SLL', 'DLT_LOOP', 'DLT_NULL', 'DLT_PFLOG', 'DLT_PFSYNC', 'DLT_PPP', 'DLT_PRONET', 'DLT_RAW', 'DLT_SLIP', 'author', 'builtins', 'copyright', 'doc', 'file', 'license', 'name', 'url', 'version', 'bpf', 'dltoff', 'ex_name', 'lookupdev', 'pcap', 'sys'] Noting the lack of pcapObject. Why is this? What could cause this?

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• llvm-py questions

  - by DSblizzard

  1) Is it possible to use llvm-py on Windows without Visual Studio 2008? Maybe I can compile files on another computer and use on my? 2) Is llvm-py mature enough in your opinion? If not, what are the problems?

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• Is it possible to calculate distance on GeoDjango in a SELECT statement?

  - by alex

  I am using MYSQL. I have a table with 1 column, a Point field. I want to SELECT all rows that have a point with a distance less than 50 meters of my given point. Simple enough, right? Below is how it's done in RAW SQL. But of course, I want to use GeoDjango to do this. cursor.execute("SELECT * FROM project_location WHERE\ (GLength(LineStringFromWKB(LineString(asbinary(utm), asbinary(PointFromWKB(point(%s, %s)))))) < 50)\

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• Scipy Negative Distance? What?

  - by disappearedng

  I have a input file which are all floating point numbers to 4 decimal place. i.e. 13359 0.0000 0.0000 0.0001 0.0001 0.0002` 0.0003 0.0007 ... (the first is the id). My class uses the loadVectorsFromFile method which multiplies it by 10000 and then int() these numbers. On top of that, I also loop through each vector to ensure that there are no negative values inside. However, when I perform _hclustering, I am continually seeing the error, "Linkage Z contains negative values". I seriously think this is a bug because: I checked my values, the values are no where small enough or big enough to approach the limits of the floating point numbers and the formula that I used to derive the values in the file uses absolute value (my input is DEFINITELY right). Can someone enligten me as to why I am seeing this weird error? What is going on that is causing this negative distance error? ===== def loadVectorsFromFile(self, limit, loc, assertAllPositive=True, inflate=True): """Inflate to prevent "negative" distance, we use 4 decimal points, so *10000 """ vectors = {} self.winfo("Each vector is set to have %d limit in length" % limit) with open( loc ) as inf: for line in filter(None, inf.read().split('\n')): l = line.split('\t') if limit: scores = map(float, l[1:limit+1]) else: scores = map(float, l[1:]) if inflate: vectors[ l[0]] = map( lambda x: int(x*10000), scores) #int might save space else: vectors[ l[0]] = scores if assertAllPositive: #Assert that it has no negative value for dirID, l in vectors.iteritems(): if reduce(operator.or_, map( lambda x: x < 0, l)): self.werror( "Vector %s has negative values!" % dirID) return vectors def main( self, inputDir, outputDir, limit=0, inFname="data.vectors.all", mappingFname='all.id.features.group.intermediate'): """ Loads vector from a file and start clustering INPUT vectors is { featureID: tfidfVector (list), } """ IDFeatureDic = loadIdFeatureGroupDicFromIntermediate( pjoin(self.configDir, mappingFname)) if not os.path.exists(outputDir): os.makedirs(outputDir) vectors = self.loadVectorsFromFile( limit, pjoin( inputDir, inFname)) for threshold in map( lambda x:float(x)/30, range(20,30)): clusters = self._hclustering(threshold, vectors) if clusters: outputLoc = pjoin(outputDir, "threshold.%s.result" % str(threshold)) with open(outputLoc, 'w') as outf: for clusterNo, cluster in clusters.iteritems(): outf.write('%s\n' % str(clusterNo)) for featureID in cluster: feature, group = IDFeatureDic[featureID] outline = "%s\t%s\n" % (feature, group) outf.write(outline.encode('utf-8')) outf.write("\n") else: continue def _hclustering(self, threshold, vectors): """function which you should call to vary the threshold vectors: { featureID: [ tfidf scores, tfidf score, .. ] """ clusters = defaultdict(list) if len(vectors) > 1: try: results = hierarchy.fclusterdata( vectors.values(), threshold, metric='cosine') except ValueError, e: self.werror("_hclustering: %s" % str(e)) return False for i, featureID in enumerate( vectors.keys()):

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• tweepy documentation

  - by andy

  Hi everybody I just began working on a little twitter-app using tweepy. is there any kind of useful (and complete) documentation for tweepy? I googled like hell but didn't find anything. greetings, Andy

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• Trace/BPT trap when running feedparser inside a Thread object

  - by simao

  Hello, I am trying to run a Thread to parse a list of links using the universal feed parser, but when I start the thread I get a Trace/BPT trap. Here's the code I am using: class parseRssFiles(Thread): def __init__ (self,rssLinks): Thread.__init__(self) self.rssLinks = rssLinks def run(self): self.rssContents = [ feedparser.parse(link) for link in rssLinks] Is there any other way to do this? Link to the report generated by Mac OS X 10.6.2: http://simaom.com/trace.txt Thanks

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• Running an allocation simulation repeatedly breaks after the first run.

  - by Az

  Background I have a bunch of students, their desired projects and the supervisors for the respective projects. I'm running a battery of simulations to see which projects the students end up with, which will allow me to get some useful statistics required for feedback. So, this is essentially a Monte-Carlo simulation where I'm randomising the list of students and then iterating through it, allocating projects until I hit the end of the list. Then the process is repeated again. Note that, within a single session, after each successful allocation of a project the following take place: + the project is set to allocated and cannot be given to another student + the supervisor has a fixed quota of students he can supervise. This is decremented by 1 + Once the quota hits 0, all the projects from that supervisor become blocked and this has the same effect as a project being allocated Code def resetData(): for student in students.itervalues(): student.allocated_project = None for supervisor in supervisors.itervalues(): supervisor.quota = 0 for project in projects.itervalues(): project.allocated = False project.blocked = False The role of resetData() is to "reset" certain bits of the data. For example, when a project is successfully allocated, project.allocated for that project is flipped to True. While that's useful for a single run, for the next run I need to be deallocated. Above I'm iterating through thee three dictionaries - one each for students, projects and supervisors - where the information is stored. The next bit is the "Monte-Carlo" simulation for the allocation algorithm. sesh_id = 1 for trial in range(50): for id in randomiseStudents(1): stud_id = id student = students[id] if not student.preferences: # Ignoring the students who've not entered any preferences for rank in ranks: temp_proj = random.choice(list(student.preferences[rank])) if not (temp_proj.allocated or temp_proj.blocked): alloc_proj = student.allocated_proj_ref = temp_proj.proj_id alloc_proj_rank = student.allocated_rank = rank successActions(temp_proj) temp_alloc = Allocated(sesh_id, stud_id, alloc_proj, alloc_proj_rank) print temp_alloc # Explained break sesh_id += 1 resetData() # Refer to def resetData() above All randomiseStudents(1) does is randomise the order of students. Allocated is a class defined as such: class Allocated(object): def __init__(self, sesh_id, stud_id, alloc_proj, alloc_proj_rank): self.sesh_id = sesh_id self.stud_id = stud_id self.alloc_proj = alloc_proj self.alloc_proj_rank = alloc_proj_rank def __repr__(self): return str(self) def __str__(self): return "%s - Student: %s (Project: %s - Rank: %s)" %(self.sesh_id, self.stud_id, self.alloc_proj, self.alloc_proj_rank) Output and problem Now if I run this I get an output such as this (truncated): 1 - Student: 7720 (Project: 1100241 - Rank: 1) 1 - Student: 7832 (Project: 1100339 - Rank: 1) 1 - Student: 7743 (Project: 1100359 - Rank: 1) 1 - Student: 7820 (Project: 1100261 - Rank: 2) 1 - Student: 7829 (Project: 1100270 - Rank: 1) . . . 1 - Student: 7822 (Project: 1100280 - Rank: 1) 1 - Student: 7792 (Project: 1100141 - Rank: 7) 2 - Student: 7739 (Project: 1100267 - Rank: 1) 3 - Student: 7806 (Project: 1100272 - Rank: 1) . . . 45 - Student: 7806 (Project: 1100272 - Rank: 1) 46 - Student: 7714 (Project: 1100317 - Rank: 1) 47 - Student: 7930 (Project: 1100343 - Rank: 1) 48 - Student: 7757 (Project: 1100358 - Rank: 1) 49 - Student: 7759 (Project: 1100269 - Rank: 1) 50 - Student: 7778 (Project: 1100301 - Rank: 1) Basically, it works perfectly for the first run, but on subsequent runs leading upto the nth run, in this case 50, only a single student-project allocation pair is returned. Thus, the main issue I'm having trouble with is figuring out what is causing this anomalous behaviour especially since the first run works smoothly. Thanks in advance, Az

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• Processing a log to fix a malformed IP address ?.?.?.x

  - by skymook

  I would like to replace the first character 'x' with the number '7' on every line of a log file using a shell script. Example of the log file: 216.129.119.x [01/Mar/2010:00:25:20 +0100] "GET /etc/.... 74.131.77.x [01/Mar/2010:00:25:37 +0100] "GET /etc/.... 222.168.17.x [01/Mar/2010:00:27:10 +0100] "GET /etc/.... My humble beginnings... #!/bin/bash echo Starting script... cd /Users/me/logs/ gzip -d /Users/me/logs/access.log.gz echo Files unzipped... echo I'm totally lost here to process the log file and save it back to hd... exit 0 Why is the log file IP malformed like this? My web provider (1and1) has decide not to store IP address, so they have replaced the last number with the character 'x'. They told me it was a new requirement by 'law'. I personally think that is bs, but that would take us off topic. I want to process these log files with AWstats, so I need an IP address that is not malformed. I want to replace the x with a 7, like so: 216.129.119.7 [01/Mar/2010:00:25:20 +0100] "GET /etc/.... 74.131.77.7 [01/Mar/2010:00:25:37 +0100] "GET /etc/.... 222.168.17.7 [01/Mar/2010:00:27:10 +0100] "GET /etc/.... Not perfect I know, but least I can process the files, and I can still gain a lot of useful information like country, number of visitors, etc. The log files are 200MB each, so I thought that a shell script is the way to go because I can do that rapidly on my Macbook Pro locally. Unfortunately, I know very little about shell scripting, and my javascript skills are not going to cut it this time. I appreciate your help.

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