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Articole: 25

  1. How to Check if a QLineEdit is Empty in Python — Empty strings are falsey in Python

    (Python GUIs)

    A reader asked: I just want to know, how do I check whether a QLineEdit is empty or not?

  2. Fixing Crashes When Using NumPy Arrays with QImage in Qt Threads — How to safely pass image data between threads when streaming video or updating displays

    (Python GUIs)

    I'm using a threaded runner to stream a live video feed by converting a NumPy array to a QImage, then to a QPixmap, and displaying it on a QLabel.

  3. Clean up on exit — Stopping threads when closing a PyQt6 application — How to properly shut down background threads and workers when your application window is closed

    (Python GUIs)

    I'm using QThreadPool and worker threads in my PyQt application.

  4. Understanding QPainter Coordinates in PyQt6 — How the coordinate system works for drawing on canvases in PyQt6

    (Python GUIs)

    I really having trouble understanding the coordinate system used in QPainter.

  5. Are there any built-in QIcons? — Using built-in icons for your apps.

    (Python GUIs)

    In the tutorials on this site and in my books I recommend using the fugue icons set.

  6. Creating PySide6 UI without .ui / Qt Designer — Build your entire GUI in pure Python code, no .ui files required

    (Python GUIs)

    Is it possible to write a PySide6 application without using .ui files or Qt Designer?

  7. Adding QTabWidget to a Layout Alongside Other Widgets in PyQt6 — How to combine QTabWidget with other layouts without it taking over your entire window

    (Python GUIs)

    I'm trying to create a layout in PyQt and implement different layouts into one QHBoxLayout.

  8. Handling Image Drag and Drop from Web Browsers in PyQt6 — Why toLocalFile() returns an empty string and how to handle remote image drops correctly

    (Python GUIs)

    When dragging and dropping images from a web browser into a PyQt6 rich text editor, toLocalFile() sometimes returns a blank string.

  9. Constantly Print Subprocess Output While Process is Running — How to stream live output from a subprocess into your PyQt6 GUI without freezing the interface

    (Python GUIs)

    I need to call a legacy Bash program and display the results in a Qt window.

  10. Why Widgets Appear as Separate Windows — Understanding widget parenting in Qt and how to fix widgets that float outside your main window

    (Python GUIs)

    Sometimes when I dynamically add widgets to tabs in my PyQt6 application, they pop out as windows instead.

  11. How to Set Row Background Colors in a QTableView — Use Qt's BackgroundRole to color entire rows based on your data

    (Python GUIs)

    I have a QTableView table showing some data about connected devices.

  12. Authentication and Authorization with PyQt6 or PySide6 — Secure your desktop applications with login flows, token-based auth, and role-based access control

    (Python GUIs)

    How can I add authentication and authorization to a PyQt6 application?

  13. Fixing Missing Icons in PyInstaller-Packaged PyQt6 Applications on Windows — Why your app icon disappears after packaging and how to fix it

    (Python GUIs)

    I've packaged my PyQt application with PyInstaller, but the icon isn't showing up — both the executable icon and the running application icon are just the default Python/Windows icon.

  14. Adding QComboBox to a QTableView and getting/setting values after creation — Use QItemDelegate to embed combo boxes in your table views, with per-row data and value tracking

    (Python GUIs)

    I'm using a QTableView to display data, and would like to limit the choices in some of the fields using a drop-down.

  15. How to Add Custom Widgets to Qt Designer — Use widget promotion to integrate your own Python widgets into Qt Designer layouts

    (Python GUIs)

    Can I use custom widgets in Qt Designer?

  16. Sorting and Filtering a QTableView with QSortFilterProxyModel — Learn how to add interactive sorting and filtering to your PyQt/PySide table views without touching your underlying data

    (Python GUIs)

    I'm using QTableView to show some data, which works well.

  17. Streamlit Buttons — Making things happen with Streamlit buttons

    (Python GUIs)

    Streamlit is a popular choice for creating interactive web applications in Python.

  18. Actions in one thread changing data in another — How to communicate between threads and windows in PyQt6

    (Python GUIs)

    I have a main window that starts background threads (e.g., handling GPIO data).

  19. Streamlit Widgets — An Overview of Commonly Used Widgets in Streamlit

    (Python GUIs)

    Streamlit is a powerful Python library designed to build interactive web apps with minimal code.

  20. Checkboxes in Table Views with a Custom Model — Show checkboxes for boolean values in PyQt/PySide table views

    (Python GUIs)

    I have a QTableView with a custom QAbstractTableModel, and I want to add a column of checkboxes.

  21. What does @pyqtSlot() do? — Is the pyqtSlot decorator even necessary?

    (Python GUIs)

    When working with Qt slots and signals in PyQt6 you will discover the @pyqtSlot decorator.

  22. Getting Started With Flet for GUI Development — Your First Steps With the Flet Library for Desktop and Web Python GUIs

    (Python GUIs)

    Getting started with a new GUI framework can feel daunting.

  23. Getting Started With NiceGUI for Web UI Development in Python — Your First Steps With the NiceGUI Library for Web UI Development

    (Python GUIs)

    NiceGUI is a Python library that allows developers to create interactive web applications with minimal effort.

  24. Getting Started With DearPyGui for GUI Development — Your First Steps With the DearPyGui Library for Desktop Python GUIs

    (Python GUIs)

    Getting started with a new GUI framework can feel daunting.

  25. Saving and Restoring Application Settings with QSettings in PyQt6 — Learn how to use QSettings to remember user preferences, window sizes, and configuration options between sessions

    (Python GUIs)

    Most desktop applications need to remember things between sessions.