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• How can I check for unused import in many Python files?

  - by Thierry Lam

  I remember when I was developing in C++ or Java, the compiler usually complains for unused methods, functions or imports. In my Django project, I have a bunch of Python files which have gone through a number of iterations. Some of those files have a few lines of import statement at the top of the page and some of those imports are not used anymore. Is there a way to locate those unused imports besides eyeballing each one of them in each file? All my imports are explicit, I don't usually write from blah import *

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• Does F# have an equivalent to Haskell's take?

  - by McMuttons

  In Haskell, there is a function "take n list" which returns the first n elements from a list. For example "sum (take 3 xs)" sums up the first three elements in the list xs. Does F# have an equivalent? I expected it to be one of the List-functions, but I can't spot anything that seems to match.

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• How to hook a function for a particular shared ELF library?

  - by iUm

  LD_PRELOAD hooks some functions for the entire process, but I need to hook a particular function for only one dynamically linked library by its name.

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• Sharing class member data between sub components

  - by Tim Gradwell

  I have an aggregate 'main' class which contains some data which I wish to share. The main class also has other class members. I want to share the data with these other class members. What is the correct / neatest way to do this? The specific example I have is as follows. The main class is a .net Form. I have some controls (actually controls within controls) on the main form which need access to the shared data. Main Form - DataX - DataY - Control1 -- Subcontrol1 - Control2 -- SubControl2 SubControls 1 and 2 both wish to access DataX and DataY. The trouble is, I feel like better practice (to reduce coupling), would be that either subcontrols should not know about Main Form, or Main Form should not know about subcontrols - probably the former. For subcontrols not to know about Main Form, would probably mean Main Form passing references to both Controls 1 and 2, which in turn would pass the references on to SubControls 1 and 2. Lots of lines of code which just forward the references. If I later added DataZ and DataW, and Controls 3 and 4 and SubControls 3 and 4, I'd have to add lots more reference forwarding code. It seems simpler to me to give SubControls 1 and 2 member references to Main Form. That way, any sub control could just ask for MainForm.DataX or MainForm.DataY and if I ever added new data, I could just access it directly from the sub controls with no hassle. But it still involves setting the 'MainForm' member references every time I add a new Control or Subcontrol. And it gives me a gut feeling of 'wrong'. As you might be able to tell I'm not happy with either of my solutions. Is there a better way? Thanks

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• Receiving data from a USB device in C or C++

  - by Midas

  It starts to bore me that I always have to ask questions about trifles. I simply need a list of all plugged in USB devices and have the user select one to let the console application receive any data the USB device sends. I can then start playing around with the data in my program. I don't want to use library's, only standard C++ functions, and the program should work in Windows 98.

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• Why does string::find return size_type and not an iterator?

  - by dehmann

  In C++, why does string::find return size_type and not an iterator? It would make sense because functions like string::replace or string::insert take iterators as input, so you could find some character and immediately pass the returned iterator to replace, etc. Also, std::find returns an iterator -- why is std::string::find different?

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• Why can't I make my parameter like this?

  - by mystify

  - (void)setPropertyValue:(const *void)inValue forID:(UInt32)propertyID { } The compiler doesn't like the const *void, for some reason. When I have that, it says: error: expected ')' before 'void' When I make the parameter like (UInt32)foo there is no problem. Does const *void only work in functions? I need a parameter which can be a "pointer to anything" like UInt32, Float64, etc.

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• Any way to detect SMS to E-Mail Gateways?

  - by Paul

  I want to create a PHP app that can send text messages. There are different gateways for different email carriers. Is there any library I could use that would be able to lookup or detect which gateway to use just by passing the phone number into it? This way I can take whatever email address I get out and use PHP's email functions to send a message. Thanks in advance!

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• managing IB objects without iboutlets

  - by palominoz

  i have got 24 buttons in my project.I need to manage them but I don't want to get my MainViewController polluted by 24 declarations of pointers, properties & synthesizes. i was thinking about using buttonPushed functions and do it like: -(IBAction)buttonPushed:(id)sender{ UIbutton *button=sender; [buttons addObjectAtIndex:[sender tag]]; } my question is:is sender a pointer to the IBObject?

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• I ran out of available quote symbols in javascript!

  - by Chaotic_one

  I can't believe it, but this is really happening. I ran out of available quote symbols using jquery and javascript native functions together. Can somebody help? Maybe there is yet another symbol? var t=setTimeout('$("#popupChange").html('<img src="http://servername/pdf/picture/genericThrobber.gif" />');',2000);

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• how to write hello world in assembler under windows?

  - by feiroox

  Hi I wanted to write something basic in assembly under windows, I'm using nasm, but I can't get anything working. How to write and compile hello world without help of c functions on windows? thx

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• FORTRAN: determine variable type

  - by tibbs

  hello, GOOGLE has yet to find an answer for me, so here goes: In FORTRAN, is there a way to determine the TYPE of a variable? E.G., pass the variable type as an argument in a function, to then be able to call type-specific code with that fuction; eliminating the need to have seperate similar functions for each data type. thanks.

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• Do you use any GoogleMaps Api PHP wrapper class/libarary/script to plot maps?

  - by Wbdvlpr

  I want to display google maps (mutliple markers etc) and just found that there is one paid solution "GMap 2.3" for PHP. I was looking for an open source solution. Do you guys code using Google Maps API functions or use any wrapper script? What are some good links for this?

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• Defragmenting the registry

  - by team-ferrari22

  Hi All, Does any body know how to defragment windows registry. We googled and found several free tools doing the same.But no tool is having open source. One tool is there - 'UltraDefrag' which is open source tool written in 'C' for file defragmentation. Please provide help in searching open source/ sample code to defragment windows registry...or any windows API functions or libraries for doing the same. Regards.

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• Are there any (somewhat) advanced mathematics Javascript libraries?

  - by pr1001

  Are there any libraries knocking around that provide any additional general purpose math functions for Javascript? Say things like sums over a range, derivatives, integrals, etc. I can imagine that many things aren't possible, so even libraries that do rough approximations would be interesting. Thanks!

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• exclude the folders - url rewrite in htaccess

  - by aquagirl

  rewriteCond %{REQUEST_URI} ^(ajax|css|functions|image_viewer|images|img|include|fancybox|jquery|jscript|json)$ - [L] RewriteRule ^(.[^/])/(.[^/])/(.+[^/]) ?program=$1&usertype=$2&username=$3 [NC] could you please help me find what is wrong in this.. ? I need to exclude some folders from url rewriting. i tried with the solution given here.. but still i am getting some errors.. http://www.idxsync.com/sbaor/Search/Agent/zz please help me

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• How can I make python be more friendly regarding reading and writing Unicode text files?

  - by bogdan

  I found that even modern Python versions (like 3.x) are not able to detect BOM on text files. I would like to know if there is any module that could add this missing feature to Python by replacing the open() and codecs.open() functions for reading and writing text files.

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• matlab: subs on symbolic constant returns scalar instead of vector for a vector input

  - by noam

  usually, symbolic functions return vectors for vector inputs: syms('x'); f=x*2; subs(f,[1 2 3]) outputs: [2 4 6] but doing f=sym('0'); subs(f,[1 2 3]); outputs: 0 and not: [0 0 0] so basically, my questions is how do I make f behave as a "normal" symbolic function. I can do something ugly like f=x-x to create a function that always returns zero, but is there a prettier way?

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• Difference between echo, print and printf

  - by Chakrapani

  please healp out my question... what is the difference between the following functions in php 1. echo 2. print 3. printf

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• jQuery: what if I don't have mouseleave function ?

  - by Patrick

  hi, I'm using Drupal for a website and I can only use jQuery 1.2.7 (not the most recent versions). I want to fade in / fade out a div element and I'm using mouseover / mouseout functions. However, this element contains some children and when I move the mouse over it, the mouseout function is triggered, because I'm moving over one of its children. Since I don't have mouseleave function, how can I solve this issue ? thanks

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• Struct inside a class

  - by Balakrishnan

  I have a class definition of the form class X { public: //class functions private: A_type *A; //other class variables }; and struct A_type is defined as struct A_type { string s1,s2,s3; }; Inside the constructor, I allocate appropriate memory for A and try A[0].s1="somestring"; It shows segmentation fault. Is this kind of declaration invalid, or am I missing something

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• Video For Windows disable FILE_FLAG_NO_BUFFERING

  - by cunzlow

  I am using Video For Window's AVIFile functions. When I use AVIFileOpen I notice that it uses the flag FILE_FLAG_NO_BUFFERING when creating the .avi file. ProcessMonitor shows the that file was created with "no buffering". This flag is causing performance issues and I was wondering if there is a way to use this function without that flag.

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• Grails - how to save a domain object inside a Service ?

  - by w-

  I have a service and inside one of the functions i'm creating a domain object and trying to save it. when it gets to the save part, i get the error No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here What do i need to do in order to save a domain object inside of a service. everything on the internet makes it look like this should just work....

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• C++ int vector to c#

  - by Stefan Koenen

  I'm doing a C# project and I want to call next_permutation from the algorithm library in C++. I found the way to call c++ functions in c# but i dont know how to get vectors from c++ and use it in c# (cause next_permutation require a int vector...) this is what I'm trying at the moment: extern void NextPermutation(vector<int>& permutation) { next_permutation (permutation.begin(),permutation.end()); } [DllImport("PEDLL.dll", CallingConvention = CallingConvention.Cdecl)] private static extern void NextPermutation(IntPtr test);

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• Speeding up a group by date query on a big table in postgres

  - by zaius

  I've got a table with around 20 million rows. For arguments sake, lets say there are two columns in the table - an id and a timestamp. I'm trying to get a count of the number of items per day. Here's what I have at the moment. SELECT DATE(timestamp) AS day, COUNT(*) FROM actions WHERE DATE(timestamp) >= '20100101' AND DATE(timestamp) < '20110101' GROUP BY day; Without any indices, this takes about a 30s to run on my machine. Here's the explain analyze output: GroupAggregate (cost=675462.78..676813.42 rows=46532 width=8) (actual time=24467.404..32417.643 rows=346 loops=1) -> Sort (cost=675462.78..675680.34 rows=87021 width=8) (actual time=24466.730..29071.438 rows=17321121 loops=1) Sort Key: (date("timestamp")) Sort Method: external merge Disk: 372496kB -> Seq Scan on actions (cost=0.00..667133.11 rows=87021 width=8) (actual time=1.981..12368.186 rows=17321121 loops=1) Filter: ((date("timestamp") >= '2010-01-01'::date) AND (date("timestamp") < '2011-01-01'::date)) Total runtime: 32447.762 ms Since I'm seeing a sequential scan, I tried to index on the date aggregate CREATE INDEX ON actions (DATE(timestamp)); Which cuts the speed by about 50%. HashAggregate (cost=796710.64..796716.19 rows=370 width=8) (actual time=17038.503..17038.590 rows=346 loops=1) -> Seq Scan on actions (cost=0.00..710202.27 rows=17301674 width=8) (actual time=1.745..12080.877 rows=17321121 loops=1) Filter: ((date("timestamp") >= '2010-01-01'::date) AND (date("timestamp") < '2011-01-01'::date)) Total runtime: 17038.663 ms I'm new to this whole query-optimization business, and I have no idea what to do next. Any clues how I could get this query running faster?

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