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When you use Qt_Designer or Qt_Creator to design a form, objectName for any given widget is always set to something. But if you create a widget in code AND you need the objectName later, you have to assign it explicitly. So then the widget assignment takes at least two lines of code. This seems very inelegant.
Example:
button1 = QPushButton('button caption') # at this point objectName is some kind of empty string
button1.setObjectName('button1')
If you need to find the widget later (i.e. with findChild), you must have objectName set, otherwise you're out of luck.
Is there some way to automatically set objectName without extra lines of code? I looked at the PyQt5 Reference Guide and could not find such a feature. A similar question was asked on Code Review, but got no answers. Two lines of code isn't the end of the world, but it seems redundant. Somehow I'm required to assign this name twice once for Python (first line) and again for Qt.
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In this article we will see how we can set the object name of the spin box, object name is basically name given to the object of spin box, when we find the object in the PyQt5 application with the help of object name with the help of findChild method. In order to do this we will use setObjectName method..
The QWidget widget is the base class of all user interface objects in PyQt5. We provide the default constructor for QWidget . The default constructor has no parent. A widget with no parent is called a window.
PyQt canvas for displaying Matplotlib plots. This module provides a PyQt canvas for Matplotlib to render its plots on. The canvas supports zooming and displays cursor position in axes coordinates as the cursor moves across the canvas. A plot window is an object of the QWidget class.
In PyQt, layout managers are classes that provide the required functionality to automatically manage the size, position, and resizing behavior of the widgets in the layout. With layout managers, you can automatically arrange child widgets within any parent, or container, widget.
button1 = QPushButton('button caption', objectName='button1')
You can extend this to any Qt property during initialization:
button1 = QPushButton(text='button caption', objectName='button1', icon=icon1)
Moreover, signals can be connected when constructing an object, too:
button1 = QPushButton(text='button caption', objectName='button1', clicked=someMethod)
The added named argument is equivalent to button1.clicked.connect(someMethod)
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