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  • Python - How is this snippet working?

    - by orokusaki
    For some reason this function confused me: def protocol(port): return port == "443" and "https://" or "http://" Can somebody explain the order of what's happening behind the scenes to make this work the way it does. I understood it as this until I tried it: Either A) def protocol(port): if port == "443": if bool("https://"): return True elif bool("http://"): return True return False Or B) def protocol(port): if port == "443": return True + "https://" else: return True + "http://" Is this some sort of special case in Python, or am I completely misunderstanding how statements work?

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  • Hold a network connection although IP address change

    - by rursw1
    Hi, Is it possible to hold an open TCP connection with a client, while the IP address of the client is externally changed? For example, the connection is establishes against address X, but somewhen while the connection is open, the client-side user asks for IP renew and gets another IP address. Can the connection remains alive in this case? Thanks in advance.

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  • Python: if key in dict vs. try/except

    - by LeeMobile
    I have a question about idioms and readability, and there seems to be a clash of Python philosophies for this particular case: I want to build dictionary A from dictionary B. If a specific key does not exist in B, then do nothing and continue on. Which way is better? try: A["blah"] = B["blah"] except KeyError: pass or if "blah" in B: A["blah"] = B["blah"] "Do and ask for forgiveness" vs. "simplicity and explicitness". Which is better and why?

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  • Operation precedence on postgress

    - by user24691
    I have set new division on postgress pg_operator table because i want tath when is division by zero return 0. i have write this: create operator / ( procedure = zero_division, leftarg = double precision, rightarg = double precision); where zero_division is: CREATE OR REPLACE FUNCTION zero_division(double precision, double precision) RETURNS double precision AS 'select case when $2 = 0 then 0 else $1 / $2::real end;' LANGUAGE sql IMMUTABLE COST 100; when i run value/ 0 i get error of division.

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  • initialize a const array in a class initializer in C++

    - by Nathan Fellman
    I have the following class in C++: class a { const int b[2]; // other stuff follows // and here's the constructor a(void); } The question is, how do I initialize b in the initialization list, given that I can't initialize it inside the body of the function of the constructor, because b is const? This doesn't work: a::a(void) : b([2,3]) { // other initialization stuff } Edit: The case in point is when I can have different values for b for different instances, but the values are known to be constant for the lifetime of the instance.

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  • How could I pass the float number by value in obj-c?

    - by user313439
    - (void)applicationDidFinishLaunching:(UIApplication *)application{ // Override point for customization after application launch [window makeKeyAndVisible]; [self printFloat:1.3f]; } - (void)printFloat:(float)f { NSLog(@"%f",f); } I passed the "1.3f" to printFloat, but it was the wrong value (in this case, -2.000000) after "f" received. And there is a warning that "AppDelegate may not respond to -printFloat:" Where did I get it wrong? Thanks.

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  • How can I implement incremental search on command line?

    - by florianbw
    I'd like to write small scripts which feature incremental search (find-as-you-type) on the command line. Use case: I have my mobile phone connected via USB, Using gammu --sendsms TEXT I can write text messages. I have the phonebook as CSV, and want to search-as-i-type on that. What's the easiest/best way to do it? It might be in bash/zsh/Perl/Python or any other scripting language.

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  • Indexing one-dimensional numpy.array as matrix

    - by Alain
    I am trying to index a numpy.array with varying dimensions during runtime. To retrieve e.g. the first row of a n*m array a, you can simply do a[0,:] However, in case a happens to be a 1xn vector, this code above returns an index error: IndexError: too many indices As the code needs to be executed as efficiently as possible I don't want to introduce an if statement. Does anybody have a convenient solution that ideally doesn't involve changing any data structure types?

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  • can I have an abstract base class with the key attribute being generic

    - by Greg
    Hi, I want to create a re-usable library. I was going to use extension methods however I run into some issues in some cases for the client to have to specify in the calling method the types. QUESTION - If I use an abstract base class as the basis, can I specify an attribute/property in the class to be generic (e.g. the key property might be an 'int' in one case, or a 'string' in another)?

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  • Parameters in stored procedures in SQL Server

    - by Sanju
    How many types of parameters are there in a stored procedures and what are they? Thanks in advance. And can we delete a table using view? I think yes but in what situation we can't delete it if there are no trigger associated with that table. I mean to say i need to delete a table which has no trigger associated with it using view, in which case i can't delete it?

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  • can you use jquery datepickers renderCalendar with the multimonth plugin

    - by oo
    using jquery date picker you can render specific cells the way you want. (in my case i have a list of dates that i want to highlight as they are important days) i see that datepicker itself supports this here: http://www.kelvinluck.com/assets/jquery/datePicker/v2/demo/renderCalendarCallback.html but i dont see the multimonth implementation having an option for renderingcustomDates http://www.kelvinluck.com/assets/jquery/datePicker/v2/demo/datePickerMultiMonth3.html was this missed out in the implementation to expose this functionality?

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  • In an AVL tree, at what condition the balancing is to be done? proper code in c languge

    - by bachchan
    Binary search follows Divide and Conquer method where as linear Search doesn't follw.The time complexity of Binary Search in O(log n) but incase of linear search the time complexity is O(n). Thats way Binary search is having bettr prior than linear search. But it is true when the list of items is large incase of smaller list linear is best(i.e.- it is only when the Best Case concern)

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  • CSS: right wrapper dropping off the end of the page

    - by user310606
    I have an issue with a site I am working on where the right wrapper keeps dropping down below the site. Obviously I want it to stay on the right hand side. I've coded up a test case which shows my issue (I think) and I'm wondering if there is a better way to do things. The website url is http://www.musicworkshop.co.nz/ Below is the test case which (I think) is the cause of my issue, however it may not be. The pink box drops down if it does not fit within the page width. Is there a better way to do this? John <html> <head> <title> Test page </title> <link rel="stylesheet" href="test.css" type="text/css" /> </head> <body> <div id="superbox"> <div id="box1"> </div> <div id="box2"> </div> <div id="box3"> </div> <div id="box4"> </div> <div id="box5"> </div> <div id="box6"> </div> </div> </body> </html> #outsidebox{ width: 100%; } #superbox{ width: 1000px; height: 100px; margin: 0 auto; } #box1{ height: 100px; width: 200px; background: red; float: left; } #box2{ height: 100px; width: 200px; background: yellow; float: left; } #box3{ height: 100px; width: 200px; background: blue; float: left; } #box4{ height: 100px; width: 200px; background: green; float: left; } #box5{ height: 100px; width: 200px; background: grey; float: left; } #box6{ height: 100px; width: 200px; background: pink; float: left; }

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  • MS Exam 70-536 - How can you constrain the input before you write any code?

    - by Max Gontar
    Hello! In MS Exam 70-536 .Net Foundation, Chapter 3 "Searching, Modifying, and Encoding Text" in Case Scenario 1 related to regex there is a question: How can you constrain the input before you write any code? I thought it's maybe a in-mind design of regex pattern but it will not really constrain the input, will it? I am not so good in psychokinesis yet! Or maybe the is some other way? Thanks for your time!

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  • How do I make all the finders on the model ignorecase?

    - by Glex
    I have a model with several attributes, among them title and artist. The case of title and artist should be ignored in all the Active Record finders. Basically, if title or artist are present in the :conditions (or dynamically i.e. find_all_by_artist), then the WHERE artist = :artist should become WHERE UPPER(artist) = UPPER(:artist) or something along these lines. Is there a way of doing it with Rails?

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  • Python `if x is not None` or `if not x is None`?

    - by orokusaki
    I've always thought of the if not x is None version to be more clear, but Google's style guide implies (based on this excerpt) that they use if x is not None. Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convention)?* *I'm referring to any singleton, rather than just None. ...to compare singletons like None. Use is or is not.

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  • Using many mutex locks

    - by hanno
    I have a large tree structure on which several threads are working at the same time. Ideally, I would like to have an individual mutex lock for each cell. I looked at the definition of pthread_mutex_t in bits/pthreadtypes.h and it is fairly short, so the memory usage should not be an issue in my case. However, is there any performance penalty when using many (let's say a few thousand) different pthread_mutex_ts for only 8 threads?

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  • CSS: content:"\00a0"

    - by SteD
    Today I came across a new CSS syntax that I have never seen before content:"\00a0"; Checking it on w3schools, it explains: Definition and Usage The content property is used with the :before and :after pseudo-elements, to insert generated content. My question is, can you point out to me in real world example, how do we use this 'content' syntax? And what does the \00a0 mean in this case?

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  • Java: How to return single char after string

    - by newSpringer
    I have a file directory which could look like either C:\projects\lab3\test\test.java or C:\projects\assignment3\test\test.java But the "lab3" or "assignment3" can appear anywhere in the directory, it is not a set directory What i want is to check to see if the directory either contains "lab" or "assignment" and get the number that follows. In this case "3" This is what i have so far if(directory.toLowerCase().contains("lab")){ } else if (directory.toLowerCase().contains("assignment")){ } but i do not know how to check for the char straight after the word?

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  • working with android intents how to pass arguments between father and the intent h in

    - by yoavstr
    assuming i want to open another activity from my current activty and i want to pass her arguments such as in my case diffculty level how i do it?... newGameButton.setOnClickListener(new OnClickListener() { public void onClick(View view) { Intent i = new Intent(countryCityGameMenu.this,GameScreen.class); startActivityForResult(i, GlobalDataStore.STATIC_INTEGER_VALUE); } }); is there a way to pass those arguments in the calling ?... thankx

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  • My webpage ignores changes in CSS file

    - by Pavel
    No matter what I change in my .css file, the page remains the same - what's more, neither changing the link tag so that it points to another .css file nor deleting it completely makes no difference. Other changes in html code are applied. The sourcecode of the webpage shows everything as it should be. This behavior started when I redirected the link tag from previous file to the one I use now (plus there have been some changes in the tag while this problem occured, to test the behavior of my webpage); changes in neither file affect the page. For the first time when this happened, this was caused by copies of head tag in included chunks of code (for header, left menu etc. - their head part overrode the head part of the main page) and the problem was solved by removing these redundant heads from these files. But it happened again when I changed the link tag for the next time. I couldn't find any head parts in my included files, but the problem lasts (only solution I can see now is to delete the included files and copy the code directly to the file, but this would mean lots of redundant code). How can I solve this problem, so that my page response to changes in .css files without increasing redundancy? How to ensure that I can change the link to .css file just on one place with no such problems? Do I have to unload the CSS file somehow? I saw this problem both in Firefox and in Chrome. I use PSPad to write the code, just in case it would play role. EDIT: I have cleared browser cache now, and I changed the link to .css files from one to another before, but nothing helped. Now I accept the best answer saying the problem is in caching and I start a related question to find out how to solve the caching issue. If the other question's answers would say that in this case I can be sure that problem isn't in caching (very unlikely, but fail of ordinary methods of caching-problems-solving is unlikely too), I'd update this question and start searching for other possible problems, but now the message seems to be clear: when webpage ignores changes in .css files, caching is to blame.

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  • Does the compiler optimize the function parameters passed by value?

    - by Naveen
    Lets say I have a function where the parameter is passed by value instead of const-reference. Further, lets assume that only the value is used inside the function i.e. the function doesn't try to modify it. In that case will the compiler will be able to figure out that it can pass the value by const-reference (for performance reasons) and generate the code accordingly? Is there any compiler which does that?

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