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• How to detect a sign change for elements in a numpy array

  - by cb160

  I have a numpy array with positive and negative values in. a = array([1,1,-1,-2,-3,4,5]) I want to create another array which contains a value at each index where a sign change occurs (For example, if the current element is positive and the previous element is negative and vice versa). For the array above, I would expect to get the following result array([0,0,1,0,0,1,0]) Alternatively, a list of the positions in the array where the sign changes occur or list of booleans instead of 0's and 1's is fine.

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• Strange (atleast for me) behavior in Django template

  - by lud0h

  The following code snippet in a Django template (v 1.1) doesn't work. {{ item.vendors.all.0 }} == returns "Test" but the following code snippet, doesn't hide the paragraph! {% ifnotequal item.vendors.all.0 "Test" %} <p class="view_vendor">Vendor(s): {{item.vendors.all.0}} </p><br /> {% endifnotequal %} Any tips on what's wrong? Thanks.

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• SQLAlchemy - loading user by username

  - by keithjgrant

  Just diving into pylons here, and am trying to get my head around the basics of SQLALchemy. I have figured out how to load a record by id: user_q = session.query(model.User) user = user_q.get(user_id) But how do I query by a specific field (i.e. username)? I assume there is a quick way to do it with the model rather than hand-building the query. I think it has something with the add_column() function on the query object, but I can't quite figure out how to use it. I've been trying stuff like this, but obviously it doesn't work: user_q = meta.Session.query(model.User).add_column('username'=user_name) user = user_q.get()

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• Praw (Redditt API) How to retrieve replies to a comment past 10 levels deep

  - by jpreed00

  Ok, so I've written some code that, for all intents and purposes, should work: def checkComments(comments): for comment in comments: print comment.body checkComments(comment.replies) def processSub(sub): sub.replace_more_comments(limit=None, threshold=0) checkComments(sub.comments) #login and subreddit init stuff here subs = mysubreddit.get_hot(limit=50) for sub in subs: processSub(sub) However, given a submission that has 50 nested replies like so: root comment -> 1st reply -> 2nd reply -> 3rd reply ... -> 50th reply The above code only prints: root comment 1st reply 2nd reply 3rd reply 4th reply 5th reply 6th reply 7th reply 8th reply 9th reply Any idea how I can get the remaining 41 levels of replies? Or is this a praw limitation?

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• Returning all "positions" of a list

  - by Daymor

  I Have a list with "a" and "b" and the "b"'s are somewhat of a path and "a"'s are walls. Im writing a program to make a graph of all the possible moves. I got the code running to check the first "b" for possible moves, but i have NO Idea how im going to find all "b"'s , even less check them all without repeating. Major issue im having is getting the tuple coordinates of the "b"'s out of the list. Any pointers/tips?

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• How do I assign functions in a dictionary?

  - by Ziv

  hi, I'm having a problem with a simple program I wrote, I want to perform a certain function according to the users input. I've already used a dictionary as a replacement for a switch to do assignment but when I try to assign functions to the dictionary it doesn't execute them... The code: def PrintValuesArea(): ## do this def PrintValuesLength(): ## do that def PrintValuesTime(): ## do third PrintTables={"a":PrintValuesArea,"l":PrintValuesLength,"t":PrintValuesTime} PrintTables.get(ans.lower()) ## ans is the user input what did I do wrong? It looks the same as all the examples I've seen....

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• Defining the hash of an object as the sum of hashes of its members

  - by Space_C0wb0y

  I have a class that represents undirected edges in a graph. Every edge has two members vertex1 and vertex2 representing the vertices it connects. The problem is, that an edge can be specified two directions. My idea was now to define the hash of an edge as the sum of the hashes of its vertices. This way, the direction plays no role anymore, the hash would be the same. Are there any pitfalls with that?

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• how to copy one file's text to the other one..

  - by zjm1126

  i want to copy 'a.txt' 's text to 'b.txt' thanks

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• Sqlalchemy: Many to Many relationship error

  - by 1001010101

  Dear everyone, I am following the Many to many relationship described on http://www.sqlalchemy.org/docs/mappers.html#many-to-many #This is actually a VIEW tb_mapping_uGroups_uProducts = Table( 'mapping_uGroups_uProducts', metadata, Column('upID', Integer, ForeignKey('uProductsInfo.upID')), Column('ugID', Integer, ForeignKey('uGroupsInfo.ugID')) ) tb_uProducts = Table( 'uProductsInfo', metadata, Column('upID', Integer, primary_key=True) ) mapper( UnifiedProduct, tb_uProducts) tb_uGroupsInfo = Table( 'uGroupsInfo', metadata, Column('ugID', Integer, primary_key=True) ) mapper( UnifiedGroup, tb_uGroupsInfo, properties={ 'unifiedProducts': relation(UnifiedProduct, secondary=tb_mapping_uGroups_uProducts, backref="unifiedGroups") }) where the relationship between uProduct and uGroup are N:M. When I run the following sess.query(UnifiedProduct).join(UnifiedGroup).distinct()[:10] I am getting the error: sqlalchemy.exc.ArgumentError: Can't find any foreign key relationships between 'uProductsInfo' and 'uGroupsInfo' What am I doing wrong?

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• List comprehension, map, and numpy.vectorize performance

  - by mcstrother

  I have a function foo(i) that takes an integer and takes a significant amount of time to execute. Will there be a significant performance difference between any of the following ways of initializing a: a = [foo(i) for i in xrange(100)] a = map(foo, range(100)) vfoo = numpy.vectorize(foo) a = vfoo(range(100)) (I don't care whether the output is a list or a numpy array.) Is there a better way?

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• Checkboxes with pylons

  - by user268746

  Hello, I have been trying to add some check boxes in a pylons mako. However I don't know how to get their values in the controller. It seems that it can only get the first value of the check boxes. I tried using form encode but i got several errors. Is there an easier way to do this? Thanks

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• is there anything exist to convert xml -> yaml directly?

  - by shahjapan

  is there any library or way exist from which I can convert my xml records to yaml format ?

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• Sphinx: some good customization examples?

  - by Mark Harrison

  I've created a Sphinx document using sphinx-quickstart. Are there any good examples/tutorials about customizing the look? Specifically to modify the header and add a logo. Are there some projects with downloadable Sphinx docs? I would like to see how they've customized their look. update: Adding a logo is supported in the default setup, just not particularly well documented. Look in conf.py for the *_logo settings.`

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• How do i play with my cock for 6 hours on viagra without coming like a steam train, I've used crack

  - by Stan the Fart

  Come on, wank me off please, i gotta spunk in no less than 8 hours

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• Change web service url for a suds client on runtime (keeping the wsdl)

  - by patanpatan

  Hi. First of all, my question is similar to this one But it's a little bit different. What we have is a series of environments, with the same set of services. For some environments (the local ones) we can get access to the wsdl, and thus generating the suds client. For external environment, we cannot access the wsdl. But being the same, I was hoping I can change just the URL without regenerating the client. I've tried cloning the client, but it doesn't work.

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• Eclipse + PyDev becomes extremely slow with large import

  - by THeK3nger

  I'm trying to use Eclipse + PyDev for studying OpenGL programming but when I type from OpenGL.GL import * from OpenGL.GLUT import * IDE becomes extremely slow! Ok. It isn't a smart idea import to much useless things but it's so useful for learning a new library! Any help? PS: I use Ubuntu with Eclipse Galileo.

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• How to write a copyright message using matplotlib

  - by morpheous

  I am creating some graphs using matplotlib, and I want to be able to write a copyright message and my website address at the bottom of the image. Something like: © ACME Corp www.example.com Does anyone know how I may do this?

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• Hi, I would like to know if anyone knows where to get some exercises of to practise

  - by Adomas

  I think small exercises would be the baest way for me to learn programming. I am the begginer and I am willing to give plenty of time to this. To explain, to my opinion exercises should be something to write not long programs (10-30lines), to say what the program will print or that is the mistake. Who can help me and say where to maybe a website with such stuff? Thanks

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• I need to change a zip code into a series of dots and dashes (a barcode), but I can't figure out how

  - by Maggie

  Here's what I've got so far: def encodeFive(zip): zero = "||:::" one = ":::||" two = "::|:|" three = "::||:" four = ":|::|" five = ":|:|:" six = ":||::" seven = "|:::|" eight = "|::|:" nine = "|:|::" codeList = [zero,one,two,three,four,five,six,seven,eight,nine] allCodes = zero+one+two+three+four+five+six+seven+eight+nine code = "" digits = str(zip) for i in digits: code = code + i return code With this I'll get the original zip code in a string, but none of the numbers are encoded into the barcode. I've figured out how to encode one number, but it wont work the same way with five numbers.

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• Is it possible to use template tags in ValidationError's strings?

  - by feelgood

  I need to throw ValidationError containing anchor. if not profile.activated(): raise ValidationError('Your profile is not activated. <a href="{% url resend_activation_key %}">Resend activation key</a>.') What I need to modify to make this work?

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• how to make this gaema demo running on google-app-engine..

  - by zjm1126

  this is the package which has a webapp demo in it : http://code.google.com/p/gaema/source/checkout but when i login use this demo , i get a error : so how to make this demo running on the gae-launcher thanks

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• When should I use \A in a regex?

  - by S.Mark

  End of line anchor $ match even there is extra trailing \n in matched string, so we use \Z instead of $ For example ^\w+$ will match the string abcd\n but ^\w+\Z is not How about \A and when to use?

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• Fetch records using Group By from appengine datastore

  - by Pradeep Upadhyay

  I am trying something like this: result = db.GqlQuery("SELECT * FROM myDataMode COUNT(Employee) GROUP BY(Department) WHERE Salary > :1"10000) And I am getting error : BadQueryError: Parse Error: Expected no additional symbols at symbol count Can any one please help me.

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• What is the proper way to check the previous value of a field before saving an object? (Using Django

  - by anonymous coward

  I have a Django Model with updated_by and an approved_by fields, both are ForeignKey fields to the built-in (auth) User models. I am aware that with updated_by, it's easy enough to simply over-ride the .save() method on the Model, and shove the request.user in that field before saving. However, for approved_by, this field should only ever be filled in when a related field (date_approved) is first filled in. I'm somewhat certain that I can check this logically, and fill in the field if the previous value was empty. What is the proper way to check the previous value of a field before saving an object? I do not anticipate that date_approved will ever be changed or updated, nor should there be any reason to ever update the approved_by entry. UPDATE: Regarding forms/validation, I should have mentioned that none of the fields in question are seen by or editable by users of the site. If I have misunderstood, I'm sorry, but I'm not sure how forms and validation apply to my question.

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• Launch an SWF full screen

  - by Geoff

  I have a swf file (a flash game). I want to run some script to open it in full-screen mode. I'm not attached to any browser, but I do run Linux, so a bash, or generic answer is what I'm looking for. I'm also open to building a lite browser application if need-be.

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