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  • list in loop, Nonetype errors

    - by user2926755
    Here is my Code def printList(stringlist): empty = [] if stringlist is None: print empty else: print stringlist def add (stringlist, string): string = [] if string is None else string if stringlist is not None: stringlist.insert(0, string) else: stringlist.append(1) it somehow appears "AttributeError: 'NoneType' object has no attribute 'append'" I was originally looking for the code to be run like this: >>> myList = None >>> printList(myList) [] >>> for word in ['laundry','homework','cooking','cleaning']: myList = add(myList, word) printList(myList) [laundry] [homework, laundry] [cooking, homework, laundry] [cleaning, cooking, homework, laundry]

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  • WPF inherited UserControl lost VS designer support

    - by PaN1C_Showt1Me
    Hi ! I' written this UserControl: <my:MyUserControl x:Class="MyClass" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:my="clr-namespace:MyNameSpace.MyControls;assembly=MyAssembly"> </my:MyUserControl> public partial class Editor : MyNameSpace.MyControls.MyUserControl {} Everything works, the control is shown in the VS 2008 Designer, but I cannot click directly in the elements and select them as it was with UserControl. Any idea how to solve it?

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  • C++ dynamic type construction and detection

    - by KneLL
    There was an interesting problem in C++, but it concerns more likely architecture. There are many (10, 20, 40, etc) classes that describe some characteristics (mix-in classes), for exmaple: struct Base { virtual ~Base() {} }; struct A : virtual public Base { int size; }; struct B : virtual public Base { float x, y; }; struct C : virtual public Base { bool some_bool_state; }; struct D : virtual public Base { string str; } // .... Primary module declares and exports a function (for simplicity just function declarations without classes): // .h file void operate(Base *pBase); // .cpp file void operate(Base *pBase) { // .... } Any other module can has a code like this: #include "mixins.h" #include "primary.h" class obj1_t : public A, public C, public D {}; class obj2_t : public B, public D {}; // ... void Pass() { obj1_t obj1; obj2_t obj2; operate(&obj1); operate(&obj2); } The question is how to know what the real type of given object in operate() without dynamic_cast and any type information in classes (constants, etc)? Function operate() is used with big array of objects in small time periods and dynamic_cast is too slow for it. And I don't want to include constants (enum obj_type { ... }) because this is not OOP-way. // module operate.cpp void some_operate(Base *pBase) { processA(pBase); processB(pBase); } void processA(A *pA) { } void processB(B *pB) { } I cannot directly pass a pBase to these functions. And it's impossible to have all possible combinations of classes, because I can add new classes just by including new .h files. As one of solutions that comed to mind, in editor application I can use a composite container: struct CompositeObject { vector<Base *pBase> parts; }; But editor does not need a time optimization and can use dynamic_cast for parts to determine the exact type. In operate() I cannot use this solution. So, is it possible to not use a dynamic_cast and type information to solve this problem? Or maybe I should use another architecture?

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  • Returning Null values with COUNT

    - by Randy B.
    With this query, I get a result that is two short of the table because they are not included in count, and I would like get the NULL values in the result. To do this, I am pretty sure I need to use a subquery of some kind, but I am not sure how, since the attribute in question is an aggregate. SELECT Equipment.SerialNo , Name, COUNT(Assignment.SerialNo) FROM Equipment INNER JOIN Assignment ON Assignment.SerialNo = Equipment.SerialNo GROUP BY Equipment.SerialNo, Name

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  • How do I use ST_Contains in following case?

    - by Z77
    I have two tables. First with points, and second with polygons. I need to find out which points are in required polygon according to the attribute gid. Using query: SELECT table1.* FROM table1, table2 WHERE table2.gid=1 AND ST_Contains(table2.geom2, table1.geom1); What I get is empty table (only columns without data)... Tnx

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  • Is there a [Go to file...] in Xcode?

    - by Mike
    In every modern day IDE and text editor, there is an action to open a file without putting your hand on the mouse. For example: Eclipse: Cmd|Ctrl+Shift+R - Open Resource IntellIJ: Cmd|Ctrl+Shift+N - Open File TextMate: Cmd+T - Go to File In Xcode, I have found no such options. Please, please tell me I just overlooked it in my growing frustration. Is there a "Go to file" or "Open File" shortcut in Xcode?

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  • How do I disable auto- poster image generation on the video tag?

    - by ekallevig
    I'm using the 'poster' attribute on a video tag and the way it seems to work at least in webkit browsers is that it loads the poster image and then once enough of the video has loaded, it replaces that poster with an auto-generated poster from the video file itself. However, my poster images don't match the auto-generated posters which results in a weird experience of one image loading, then being replaced in a few seconds by the auto-generated image. Is there any way to prevent the auto-generated image from being used?

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  • How to document class attributes with NaturalDocs

    - by HWende
    Via """ Function: myfunc Parameters: a : First parameter b : First parameter """ I can document a function and it gets listed in the class summary. How can I do something similar with attributes? Since I don't declare them in python I was hoping something like """ ---------------------------------------------------------------------------- Attributes: first - First attribute of the class second - Second one """ That is not working at all...

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  • How to attach a line to a moving object?

    - by snow-spur
    Hello i have designed a maze and i want to draw a path between the cells as the 'person' moves from one cell to the next. So each time i move the cell a line is drawn I have done this so far but do not want to show my full code However i get an error saying Circle has no attribute center my circle which is my cell center = Point(15, 15) c = Circle(center, 12) c.setFill('blue') c.setOutline('yellow') c.draw(win) p1 = Point(c.center().getx(), c.center().gety()) this bit is in my loop p2 = Point(getx(), gety()) line = graphics.Line(p1, p2)

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  • how can i search a lots of .js and .php files for a specific phrase?

    - by Haroldo
    Windows has a go at it but only gets a few when i seach a directory. Is there an IDE or similar that allows for searching within the files of an entire directory? for example, if I need to make sure no files require to a redundant class (old_class.php) I'd like to search for 'old_class.php' or alternatively if anyone knows a way to do this in Aptana (my text editor of choice) that would be amazing...

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  • jquery adding required to a dropdownbox [SOLVED]

    - by Crays
    Hi i would like to know how do i add a required attribute to a dropdownbox? I've search numerous ways but none worked, here's my code <script> $(document).ready(function(){ $('.orderingmenu .burgers').change(function(){ var selectVal= $(this).val(); if(selectVal != 'none'){ $(this).next().attr('required', true); } }); }); </script> i am really out of idea on how to do this, i tested the selectors and they're working fine, but it just doesn't seem to add in the required attribute to that select field =/ any help please? what i have tried is $(this).next().prop('required', true); $(this).next().attr('required', 'true'); $(this).next().attr('required', ''); $(this).next().prop('required'); none have worked =/ EDIT the HTML <div class="orderingmenu" style="margin-bottom: 0.5%;"> <select name="burgerlist" class="burgers" style="width: 35%; float: left; font-size: 12px;"> <option selected="selected" value="none">NONE</option> <option value="A">A</option> </select> <select name="option" id="option" class="setornot" style="width: 30%; font-size: 12px;"> <option selected="selected" value="none">NONE</option> <option value="ALA CARTE">ALA CARTE</option> <option value="SET">SET</option> </select> <input type="text" placeholder="ANY REMARKS?" name="remarks" style="width: 30%; float: right; font-size: 12px;"> </div> i had it looped with a php script, but basically what i wanted to do is so that if there is any selection other than 'none', the other selection is required. EDIT 2 found out the problem was that i had the value for none!

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  • DisplayFor ignores metadata

    - by Juvaly
    For my Contact class, the property EmailAddress is marked with the [DataType(DataType.EmailAddress)] attribute. In my view, using Html.Display("EmailAddress") and Html.DisplayFor(c => c.EmailAddress) yields different results. The former outputs a mailto: link, which is the expected behavior, while the latter simply outputs the email address as plain text. My question is why the different behavior, I expected these two methods to have the same output.

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  • Source Code Browser

    - by James Fielding
    Hello I'm looking for a piece of relatively simple software to browse large C++ project. What I would like is something that is somewhere between a simple text editor and a full-blown IDE like Eclipse. I would like syntax highlighting, a way to see all classes/methods defined in a file, a way to find where a particular method is called from and where a variable is declared/defined. Any ideas? Thank you!

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  • Extending struts 2 "property" data tag

    - by John B.
    Hi, We are currently developing a project with Struts2. We have a module on which we display a large amount of data on read-only fields from a group of beans via the "property" Struts 2 data tag (i.e. <s:property value="aBeanProperty" /) on a jsp file. In some cases most of the fields might come empty, so a blank is being displayed on screen. Our customer is now requesting us to display default string (i.e. "N/A") whenever a property comes empty, so that it is displayed in place of the blank spaces currently shown. We are looking for a way to achieve this in a clean and maintainable way. The 'property' tag comes with a 'default' attribute on which one can define a default value in cases when the accessed property comes as null. However, most of our properties are empty strings, therefore it does not work in our case. Another solution we are thinking of is to define a base class for all of our beans, and define a util method which will validate if a string is null or empty and then return the default value. Then we would call this method from each bean getter. And yes this would be tiresome and kind of ugly :), therefore we are holding out on this one in case of a better solution. Now, we have in mind a solution which we think would be the best but have not had luck on how implement it. We are planning on extending the 'property' tag some way, defining a new 'default' attribute so that besides working on null properties, it also do so on empty strings ("", " ", etc). Therefore we would only need to replace the original s:property tag with our new custom tag, and the desired result would be achieved without touching java code. Do you have an idea on how to do this? Also, any other clever solution (maybe some sort of design pattern?) on how to default the values of a large amount of property beans are welcome too! (Or maybe, even there might be some tag that does this already in Struts2??) Thanks in advance.

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  • how to get all 'username' from my model 'MyUser' on google-app-engine ..

    - by zjm1126
    my model is : class MyUser(db.Model): user = db.UserProperty() password = db.StringProperty(default=UNUSABLE_PASSWORD) email = db.StringProperty() nickname = db.StringProperty(indexed=False) and my method which want to get all username is : s=[] a=MyUser.all().fetch(10000) for i in a: s.append(i.username) and the error is : AttributeError: 'MyUser' object has no attribute 'username' so how can i get all 'username', which is the simplest way . thanks

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  • Do I need to create icons other than RGBA for my Windows app?

    - by user843732
    I'm curious if anyone still creates icons other than RGB/A (or 32-bit with alpha-channel) for your Windows apps? PS. I know that suggested model is to create 256-color versions of icons, but I always struggle with those. If I automatically convert them in an icon editor they totally decimate the look of my original icons with jagged edges and circa-Windows95 look. So if those are still required, does anyone know the stats on how many people are still using color settings other then 32-bit TrueColor?

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