parent | 易学教程

How do I override a parent class's functions in python?

阅读更多关于 How do I override a parent class's functions in python?

问题 I have a private method def __pickSide(self): in a parent class that I would like to override in the child class. However, the child class still calls the inherited def __pickSide(self): . How can I override the function? The child class's function name is exactly the same as the parent's function name. 回答1: Let's look at the easiest example: from dis import dis class A(object): def __pick(self): print "1" def doitinA(self): self.__pick() class B(A): def __pick(self): print "2" def doitinB

Displaying hierarchal parent child data in WPF DataGrid

阅读更多关于 Displaying hierarchal parent child data in WPF DataGrid

I need to be able to display parent / child rows in a WPF datagrid, the parent are displayed with a plus / minus control which when clicked shows the related children records. In order to do this I basically place a second datagrid inside the parent grids RowDetailsTemplate and a style trigger to flip the detailsvisibility property on each row. e.g. <Grid> <DataGrid AutoGenerateColumns="False" IsReadOnly="True" ItemsSource="source" Margin="10,10,14,14" Name="dataGrid1" RowDetailsVisibilityMode="Collapsed" SelectionMode="Single"> <DataGrid.Columns> <DataGridTextColumn Binding="{Binding FullName

Is there a way to access parent modules in Python

阅读更多关于 Is there a way to access parent modules in Python

I need to know if there is a way to access parent modules from submodules. If I import submodule: from subprocess import types I have types - is there some Python magic to get access to subprocess module from types ? Something similar to this for classes ().__class__.__bases__[0].__subclasses__() . If you've accessed a module you can typically get to it from the sys.modules dictionary. Python doesn't keep "parent pointers" with names, particularly because the relationship is not one-to-one. For example, using your example: >>> from subprocess import types >>> types <module 'types' from '/opt

Php - get parent-script name

阅读更多关于 Php - get parent-script name

parent.php: require_once 'child.php'; child.php: echo __FILE__; It will show '.../child.php' How can i get '.../parent.php' print $_SERVER["SCRIPT_FILENAME"]; The chosen answer only works in environments that set server variables and specifically won’t work from a CLI script. Furthermore, it doesn't determine the parent, but only the topmost script file. You can do almost the same thing from a CLI script by looking at $argv[0], but that doesn’t provide the full path. The environment-independent solution uses debug_backtrace : function get_topmost_script() { $backtrace = debug_backtrace(

C# enum in interface/base class?

阅读更多关于 C# enum in interface/base class?

问题 i have problem with enum I need make a enum in base class or interface (but empty one) class Base { public enum Test; // ??? } and after make diffrent enums in some parent classes class Parent1 { public enum Test {A, B, C}; } class Parent2 { public enum Test {J, H, K}; } and now i have next class with method when i have to use enum class Test<T> { public void Foo(Test enum) { int value = (int) enum; // ... } } It's there any way to do something like that ? If not i have to use static ints in

How to create a delphi form containing multiple 'child' forms that can be moved/sized and show activated

阅读更多关于 How to create a delphi form containing multiple 'child' forms that can be moved/sized and show activated

I've created a form that hosts one or more 'child' forms. In my edit mode, each child form shows its border and caption bar allowing it to be moved and sized (a bit like the old MDI app). Out of my edit mode, the borders disappear and the child forms are fixed in position. For my simple demo, I'm creating the child forms thus: procedure TForm1.Button1Click(Sender: TObject); var Frm : TForm; begin Frm := TForm3.Create( Self ); Frm.Parent := Self; Frm.Visible := True; The result is a layout like this: I notice that the edit controls in the child forms are never active. I would like to have the

does foreign key always reference to a unique key in another table?

阅读更多关于 does foreign key always reference to a unique key in another table?

问题 Is it not possible that foreign key(single column) in a child table references to a parent key which has some duplicate values? 回答1: By the SQL standard, a foreign key must reference either the primary key or a unique key of the parent table. If the primary key has multiple columns, the foreign key must have the same number and order of columns. Therefore the foreign key references a unique row in the parent table; there can be no duplicates. Re your comment: If T.A is a primary key, then no

WPF Binding parent property in HierarchicalDataTemplate

阅读更多关于 WPF Binding parent property in HierarchicalDataTemplate

I have a WPF TreeView with 2 levels of data and 2 HierarchicalDataTemplate to format each level. From the HierarchicalDataTemplate at the second level, I need to bind a property in the class of the first level. I have tried in this way, but it dosn't work: Text="{Binding Path=Ori, RelativeSource={RelativeSource TemplatedParent}}" with Ori as the name of the propery Even in this way it dosn't works: Text="{Binding Path=tOri, RelativeSource={RelativeSource TemplatedParent}}" with tOri as the name of the TextBlock in the fisrt HierarchicalDataTemplate that bind the Ori propery. Can you help me?

How to access properties of Python super classes e.g. via class.dict?

阅读更多关于 How to access properties of Python super classes e.g. via __class__.__dict__?

How can I get all property names of a python class including those properties inherited from super classes ? class A(object): def getX(self): return "X" x = property(getX) a = A() a.x 'X' class B(A): y = 10 b = B() b.x 'X' a.__class__.__dict__.items() [('__module__', '__main__'), ('getX', <function getX at 0xf05500>), ('__dict__', <attribute '__dict__' of 'A' objects>), ('x', <property object at 0x114bba8>), ('__weakref__', <attribute '__weakref__' of 'A' objects>), ('__doc__', None)] b.__class__.__dict__.items() [('y', 10), ('__module__', '__main__'), ('__doc__', None)] How can I access

JavaScript get parent element and write holder div for siblings

阅读更多关于 JavaScript get parent element and write holder div for siblings

I have the following structure: <div class="parent"> <div id="child1">Content here</div> <div class="child2">Content here</div> </div> At onload, I want to include a "holder" div, that holds all the parent's children like so: <div class="parent"> <div id="holder"> <div id="child1">Content here</div> <div class="child2">Content here</div> </div> </div> Knowing only the "child1" id, how can I add a holder div around itself and siblings? Considerations The "child1" id is the only known identifier. The class "parent" and "child2" are dynamic name and will change, so can't be used as identifiers.