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Gui Applications


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When you add the panel widget to a frame and the panel is the sole child of the frame, it will automatically expand to fill the frame with itself. The wxPython framework has special thread-safe methods that you can use to communicate back to your application to let it know that the thread is finished or to give it an update. As was mentioned in the introduction, a graphical user interface is an interface that is drawn on the screen for the user to interact with. You will be using the latest wxPython for this article, which is wxPython 4, also known as the Phoenix release. The wxPython 3 and wxPython 2 versions are built only for Python 2. PyQt and Tkinter both draw their widgets themselves, which is why they don’t always match the native widgets, although PyQt is very close.

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How do I use PyQt?

Creating Your First PyQt Application 1. Import QApplication and all the required widgets from PyQt5. QtWidgets .
2. Create an instance of QApplication .
3. Create an instance of your application’s GUI.
4. Show your application’s GUI.
5. Run your application’s event loop (or main loop).

In this example, you bind your button object to the wx.EVT_BUTTON event and tell it to call on_press() when that event gets fired. While your application looks more interesting visually, it still doesn’t really do anything. For example, if you press the button, nothing really happens.

  • This means a GUI program must keep track of the “state” of its processing and respond correctly to user commands that are given in any order the user chooses.
  • The order that tasks are performed by the program is under the user’s control – not the program’s control!
  • The goal is not to create a GUI that packs the most features into a single window, using tricks specific to the application.
  • Rather it is to design a GUI that users can understand quickly, based on their experience with other programs.
  • A GUI is an attempt to represent the current state or configuration of a running system in a way that is intuitive and that the user can anticipate.

You should use wx.ListCtrl in this case as the Grid widget is overkill, and frankly it is also quite a bit more complex. Finally, you need a button to use to edit a selected MP3’s tag. When it comes to designing an interface, it’s always nice to just kind of sketch out how you think the user interface should look. .on_press() accepts a second argument that you can call event. However, the event parameter here refers to the fact that when this method is called, its second argument should be an event object of some sort.

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Finally, you have the border parameter, which tells wxPython how many pixels of border you want around the widget. The userData parameter is only used when you want to do something complex with your sizing of the widget and is actually quite rare to see in compra venta automoviles practice. In this example, you add the text control with the wx.ALL and wx.EXPAND flags. The wx.ALL flag tells wxPython that you want to add a border on all sides of the widget while wx.EXPAND makes the widgets expand as much as they can within the sizer.

graphical user interface python

When you provide exact coordinates for your widget’s position, the technique that you used is called absolute positioning. Most GUI toolkits provide this capability, but it’s not actually recommended.

You became familiar with the basics of creating GUI applications using wxPython. Finally, you want to add the horizontal sizer to the top level vertical sizer. By nesting the sizers in each other, you can design complex applications. If the user presses the dialog’s OK button, you can get the user’s path choice via the dialog’s .GetPath(). You will want to pass that path to your panel class, which you can do here by calling the panel’s .update_mp3_listing(). You could argue for creating a controller type module as well, but for something like this, you really do not need it. A case could also be made for putting each class into its own module, but to keep it compact, you will create a single Python file for all of your code.

Which is better PyQt or KIVY?

On the desktop, PyQt is better because you can get a near-native look and feel easy and you have a simple gui designer. But on mobile, it makes more sense to go with Kivy. Kivy is more oriented towards mobile interfaces. But PyQt is not only a UI library, it can also do networking, databases and other things.