slots

Python __Slots__ (Making and Using)

由 回眸只為那壹抹淺笑 提交于 2019-12-12 02:06:53
问题 I don't really get making a class and using __slots__ can someone make it clearer? For example, I'm trying to make two classes, one is empty the other isn't. I got this so far: class Empty: __slots__ =() def mkEmpty(): return Empty() class NonEmpty(): __slots__ = ('one', 'two') But I don't know how I would make "mkNonEmpty". I'm also unsure about my mkEmpty function. Thanks Edit: This is what I ended up with: class Empty: __slots__ =() def mkEmpty(): return Empty() class NonEmpty(): __slots__

How to call c++ function from qml and change the lable text

由 核能气质少年 提交于 2019-12-12 01:51:00
问题 I'm new to Blackberry 10 development. I've created simple BB 10 cascades project. I want to change the text of a label through c++ function. main.qml import bb.cascades 1.0 Page { content: Container { id: containerID Button { id: button1 objectName: "button" text: "text" onClicked: { btnClicked("New Label Text"); } } Label { id: label1 objectName: "label1" text: "Old Label Text" } } } Now in which file i've to declare and in which file i've to define the function btnClicked(QString) function.

Qt5.6 signals and slots overloading

由 六眼飞鱼酱① 提交于 2019-12-11 13:53:38
问题 I have created a class for handling data received from slots and have created several overloaded methods of the same name with a different parameter type. Is it possible to use overloaded methods as slots? I have two declarations so far: void notify(uint uintData); void notify(float fltData); However the 2nd produces a warning at runtime: QObject::connect: No such slot clsSlot::notify(float) Found this which implies it should work: http://doc.qt.io/qt-5/signalsandslots.html But it doesn't...

Watson Conversation Service using slots with operators

由 ぐ巨炮叔叔 提交于 2019-12-11 03:43:46
问题 I'm using slots for some situations, and for one of this I need to check if slot recognized a entity or a context variable. To do it I wrote @myEntity || $MyVar into the "Check" column, and put $MyVar into "Save it as" column. The problem is, when the WCS goes to this slot, my variable $MyVar is being populated with || as a prefix, resulting in || ValueFromMyVar . I did not find any restrictions to use variables on slots and also did not find restrictions about operators usage '|| &&'. Can I

Defining same slot in base and derived python class

由 佐手、 提交于 2019-12-10 10:51:18
问题 The docs say: If a class defines a slot also defined in a base class, the instance variable defined by the base class slot is inaccessible (except by retrieving its descriptor directly from the base class). This renders the meaning of the program undefined. In the future, a check may be added to prevent this. How is the undefined behavior introduced ? What would be an example ? How does the instance look like - does it have both attributes somehow ? 来源： https://stackoverflow.com/questions

How is __slots__ implemented in Python?

由 风流意气都作罢 提交于 2019-12-06 20:16:28
问题 How is __slots__ implemented in Python? Is this exposed in the C interface? How do I get __slots__ behaviour when defining a Python class in C via PyTypeObject? 回答1: When creating Python classes, they by default have a __dict__ and you can set any attribute on them. The point of slots is to not create a __dict__ to save space. In the C interface it's the other way around, an extension class has by default no __dict__ , and you would instead explicitly have to add one and add getattr/setattr

Singleshot: SLOT with arguments

由 我的未来我决定 提交于 2019-12-06 14:43:54
问题 I have a strange problem. Here is my code: def method1(self, arg1, delay=True): """This is a method class""" def recall(arg1): self.method1(arg1, delay=False) return if delay: print "A: ", arg1, type(arg1) QtCore.QTimer.singleShot(1, self, QtCore.SLOT(recall(int)), arg1) return print "B: ", arg1, type(arg1) So I get this in console: A: 0 <type 'int'> B: <type 'int'> <type 'type'> In "B" you should get the same than in "A". Anyone knows what's wrong? How can I get the arg1 value instead of its

Defining same slot in base and derived python class

由 空扰寡人 提交于 2019-12-06 06:54:34
The docs say: If a class defines a slot also defined in a base class, the instance variable defined by the base class slot is inaccessible (except by retrieving its descriptor directly from the base class). This renders the meaning of the program undefined. In the future, a check may be added to prevent this. How is the undefined behavior introduced ? What would be an example ? How does the instance look like - does it have both attributes somehow ? 来源： https://stackoverflow.com/questions/41159714/defining-same-slot-in-base-and-derived-python-class

pyQt signals/slots with QtDesigner

由 别说谁变了你拦得住时间么 提交于 2019-12-05 21:21:03
I'm trying to write a program that will interact with QGraphicsView. I want to gather mouse and keyboard events when the happen in the QGraphicsView. For example, if the user clicks on the QGraphicsView widget I will get the mouse position, something like that. I can hard code it rather easily, but I want to use QtDesigner because the UI will be changing frequently. This is the code that I have for the gui.py. A simple widget with a QGraphicsView in it. from PyQt4 import QtCore, QtGui try: _fromUtf8 = QtCore.QString.fromUtf8 except AttributeError: _fromUtf8 = lambda s: s class Ui

Python 3.6.5 “Multiple bases have instance lay-out conflict” when multi-inheritance of classes having __slots__

由 做~自己de王妃 提交于 2019-12-05 04:46:56
If I run this code, I'v got the subject error message. But why? And how to avoid it getting the C class having its parents slots? class A(): __slots__ = ['slot1'] class B(): __slots__ = ['slot2'] class C(A, B): __slots__ = [] MT-FreeHongKong Simply speak, you just cannot do it. As stated in Documentation , Multiple inheritance with multiple slotted parent classes can be used, but only one parent is allowed to have attributes created by slots (the other bases must have empty slot layouts) - violations raise TypeError. The idea behind __slots__ is to reserve specific slots for each attribute in
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