Python Slots Example

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In our example, QtGui.QLCDNumber and QtGui.QSlider will be used. We change the LCD numbers by dragging the slider. Sld.valueChanged.connect(lcd.display) Here, the slider’s valueChanged signal is connected to the LCD’s display (display) slot. A transmitter is an object that sends a signal. The receiver is the object that receives the signal. Hello Python Forum, as a learning experience I created a very basic 'Slot' machine. It's far from perfect and could definitely use many upgrades, more winning options, pay tables, etc. As for this project I was mostly focusing on functionality, and I may continue working on it from time to time to make it better (more interesting to play).

A collection of tutorials with “walkthrough” guides areprovided with Qt for Python to help new users get started. Thesedocuments were ported from C++ to Python and cover a range of topics,from basic use of widgets to step-by-step tutorials that show how anapplication is put together.

Basic tutorials¶

Real use-cases applications¶

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C++ and Python¶

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Graphical applications (GUI) are event-driven, unlike console or terminal applications. A users action like clicks a button or selecting an item in a list is called an event.

Slots

If an event takes place, each PyQt5 widget can emit a signal. A signal does not execute any action, that is done by a slot.

Related course:
Create GUI Apps with PyQt5

Signals and slot introduction
Consider this example:

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The button click (signal) is connected to the action (slot). In this example, the method slot_method will be called if the signal emits.

This principle of connecting slots methods or function to a widget, applies to all widgets,

or we can explicitly define the signal:

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PyQt supports many type of signals, not just clicks.

Free Python Code Examples

Example
We can create a method (slot) that is connected to a widget. A slot is any callable function or method.

On running the application, we can click the button to execute the action (slot).

If you are new to programming Python PyQt, I highly recommend this book.