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• Split array into smaller arrays.

  - by corymathews

  I am looking for a way to easily split a python array in half. So that if I have an array: A = [0,1,2,3,4,5] I would be able to get: B = [0,1,2] C = [3,4,5]

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• How to apply a function to a collection of elements

  - by Cue

  Consider I have an array of elements out of which I want to create a new 'iterable' which on every next applies a custom 'transformation'. What's the proper way of doing it under python 2.x? For people familiar with Java, the equivalent is Iterables#transform from google's collections framework.

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• Regex to find A and not B on a line

  - by Zach

  I'm looking for a regex to search my python program to find all lines where foo, but not bar, is passed into a method as a keyword argument. I'm playing around with lookahead and lookbehind assertions, but not having much luck. Any help? Thanks

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• What is the preferred syntax for initializing a dict?

  - by daotoad

  I'm putting in some effort to learn Python, and I am paying close attention to common coding standards. This may seem like a pointlessly nit-picky question, but I am trying to focus on best-practices as I learn, so I don't have to unlearn any 'bad' habits. I see two common methods for initializing a dict: a = { 'a': 'value', 'another': 'value', } b = dict( a='value', another='value', ) Which is considered to be "more pythonic"? Which do you use? Why?

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• Does main() need to be in every script containing handlers?

  - by Will Merydith

  Experienced Java programmer trying to learn Python. I have an applicaiton on Google App Engine and want to move my admin Handlers to a separate file. So now I have main.py and admin.py. I've set up app.yaml to route traffic properly, and have added the call to WSGIApplication() in each file to route to the appropriate Handler. My question is does each script file need def main() and the corresponding if statement: application = webapp.WSGIApplication([(r'/admin/(.*)', Admin)], debug=True) def main(): run_wsgi_app(application) if __name__ == '__main__': main()

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• Compare string with all values in array

  - by Hallik

  I am trying to fumble through python, and learn the best way to do things. I have a string where I am doing a compare with another string to see if there is a match: if paid[j].find(d)>=0: #BLAH BLAH If 'd' were an array, what is the most efficient way to see if the string contained in paid[j] has a match to any value in 'd'?

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• Auto-register class methods using decorator

  - by adamk

  I want to be able to create a python decorator that automatically "registers" class methods in a global repository (with some properties). Example code: class my_class(object): @register(prop1,prop2) def my_method( arg1,arg2 ): # method code here... @register(prop3,prop4) def my_other_method( arg1,arg2 ): # method code here... I want that when loading is done, somewhere there will be a dict containing: { "my_class.my_method" : ( prop1, prop2 ) "my_class.my_other_method" : ( prop3, prop4 ) } Is this possible?

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• How to take advantage of subprocess within Django? - Django

  - by RadiantHex

  Hi folks, I'm currently using os.popen() but have been recommended to use subprocess.popen() instead. Any ideas on how I can integrate this? It would be cool and fun to have a Python shell accessible on a Django app. But I reckon that it might be a bit complex to implement. I guess I would have to retrieve the subprocess, as a new request comes in. Any ideas?

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• GoogleAppEngine web proxy

  - by Cal S

  Does anyone know of a simple open source proxy capable of running on google app engine or where to start in making one? (preferably in python, I'm trying to bypass a site blocking system)

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• Can we only get the web page header information and not the body? (Mechanize)

  - by VN44CA

  What if I only need to download the page if it has not changed since the last download? What is the best way? can I get the size of the page first, then compare the decide if it has changed, if so, I ask for download else skip? I plan to use (python) mechanize.

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• Establish SSH Connection Between Two Isolated Machines Using a 3rd System

  - by FurryHead

  I'd like to do the following with Python: Computer 1 starts SSH server (probably using twisted or paramiko) Computer 1 connects to Server 1 (idle connection) Computer 2 connects to Server 1 Server 1 forwards Computer 2's connection to Computer 1 (connection no longer idle) Computer 1 forwards Server 1's connection to listening SSH port (on computer 1) Result being Computer 2 now has a SSH session with Computer 1, almost as if Computer 2 had started a normal SSH session (but with Server 1's IP instead of Computer 1's) I need this because I can't port forward on Computer 1's network (the router doesn't support it).

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• MySql: How to know if an entry is compressed or not

  - by Guy

  I'm working with python and mysql and I want to verify that a certain entry is compressed in the db. Ie: cur = db.getCursor() cur.execute('''select compressed_column from table where id=12345''') res = cur.fetchall() at this point I would like to verify that the entry is compressed (ie in order to work with the data you would have to use select uncompress(compressed_column)..). Ideas?

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• Ptyhon date string to date object

  - by elif

  Hi all, How do I convert a string to a date object in python? The string would be: "24052010" (corresponding to the format: "%d%m%Y") I DON'T want a datetime object. I suspect that I'm asking a trivial question but I searched and couldn't find it neither on stackoverflow nor on google. Thank you, Elif

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• Problem with re.findall (duplicates)

  - by user559385

  Hello, I tried to fetch source of 4chan site, and get links to threads. I have problem with regexp (isn't working). Source: import urllib2, re req = urllib2.Request('http://boards.4chan.org/wg/') resp = urllib2.urlopen(req) html = resp.read() print re.findall("res/[0-9]+", html) #print re.findall("^res/[0-9]+$", html) The problem is that: print re.findall("res/[0-9]+", html) is giving duplicates. I can't use: print re.findall("^res/[0-9]+$", html) I have read python docs but they didn't help.

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• Parse metadata from http live stream

  - by supo

  Hi, I'd like to extract the info string from an internet radio streamed over HTTP. By info string I mean the short note about the currently played song, band name etc. Preferably I'd like to do it in python. So far I've tried opening a socket but from there I got a bunch of binary data that I could not parse... thanks for any hints

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• How do you get a list of all the _design documents using couchdbkit?

  - by fuzzy lollipop

  I have searched all over and can't figure out how to get a list of all the design documents for a specific database in CouchDB using couchdbkit for python?

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• Displaying a list of items vertically in a table instead of horizonally

  - by MichaelMM

  I have a list of items sorted alphabetically: list = [a,b,c,d,e,f,g,h,i,j] I'm able to output the list in an html table horizonally like so: | a , b , c , d | | e , f , g , h  | | i  , j  ,    ,     | What's the algorithm to create the table vertically like this: | a , d , g , j | | b , e , h ,   | | c , f  ,  i  ,  | I'm using python, but your answer can be in any language or even pseudocode. Thanks

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• Implementing prototypes OR instantiating class objects

  - by intuited

  I'm wondering how to implement prototypal inheritance in Python. It seems like the way to do this would be to either use a metaclass to cause instantiations to actually be classes, rather than objects, or use some magical powers to transform an existing object into a class. The second method would seem to be more flexible, in that it could be applied to existing objects of varied types, while the first would likely be more convenient for typical use cases. Insights on the practicality of these two approaches, as well as alternative suggestions, are hereby requested.

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• What is the easiest, most concise way to make selected attributes in an instance be readonly?

  - by Kevin Little

  In Python, I want to make selected instance attributes of a class be readonly to code outside of the class. I want there to be no way outside code can alter the attribute, except indirectly by invoking methods on the instance. I want the syntax to be concise. What is the best way? (I give my current best answer below...)

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• Is it alright to call len() in a loop's conditional statement?

  - by DormoTheNord

  In C, it is considered bad practice to call strlen like this: for ( i = 0; strlen ( str ) != foo; i++ ) { // stuff } The reason, of course, is that it is inefficient since it "counts" the characters in a string multiple times. However, in Python, I see code like this quite often: for i in range ( 0, len ( list ) ): # stuff Is this bad practice? Should I store the result of len() in a variable and use that?

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• How to use Regular Expression to extract information from a HTML webpage?

  - by user569248

  How to use Regular Expression to extract the answer "Here is the answer" from a HTML webpage like this? <b>Last Question:</b> <b>Here is the answer</b> ..:: Update ::.. Thanks everybody! Here is my solution by using BeautifulSoup since I'm using Python framework: response = opener.open(url) the_page = response.read() soup = BeautifulSoup(''.join(the_page)) paraText1 = soup.body.find('div', 'div_id', text = u'Last Question:') if paraText1: answer = paraText1.next

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• Is there a neater way to get the first occurrence of something?

  - by Phil H

  I have a list which contains a number of things: lista = ['a', 'b', 'foo', 'c', 'd', 'e', 'bar'] I'd like to get the first item in the list that fulfils a predicate, say len(item) > 2. Is there a neater way to do it than itertools' dropwhile and next? first = next(itertools.dropwhile(lambda x: len(x) <= 2, lista)) I did use [item for item in lista if len(item)>2][0] at first, but that requires python to generate the entire list first.

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• How to make every Class Method call a specified method before execution?

  - by norm

  I want to make my Python Class behave in such a way that when any Class method is called a default method is executed first without explicitly specifying this in the called Class. An example may help :) Class animals: def _internalMethod(): self.respires = True def cat(): self._internalMethod() self.name = 'cat' def dog(): self._internalMethod() self.name = 'dog' I want _internalMethod() to be called automatically when any method is called from an instance of animals, rather than stating it explicitly in the def of each method. Is there an elegant way to do this? Cheers,

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• Programming language for opengl screenshot software

  - by mandril

  I need to develop a multiplatform software that takes screenshots from opengl games without affecting the game in performance, it will run in the background and will add a watermark to my screenshots. What language should i use? I thought of Perl / Python. Anyone can point me out something to start? Thanks!

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• What the heck kind of timestamp is this: 1267488000000

  - by twneale

  And how do I convert it to a datetime.datetime instance in python? It's the output from the New York State Senate's API: http://open.nysenate.gov/legislation/.

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