Python GUI FAQ

Common Python GUI Questions, Answered

Answers to our users most frequently answered questions, from licensing, packaging and libraries, to PyQt tips and tricks.

Showing articles for All (293) PyQt6 (38) PySide6 (9) PyQt5 (136) Streamlit (0) Tkinter (1) PySide2 (12) Kivy (0)
PyQt5

ModuleNotFoundError: No module named 'fbs_runtime'

How to fix the 'fbs_runtime' import error when running fbs projects outside of the fbs environment
PyQt5

Opening a subwindow from a button event

Published 11.05.2020
PyQt5

Packaged installer file sizes

Published 11.05.2020
PyQt5

.parent() vs. parent class in PowerBar example

Published 11.05.2020
PyQt5

QDialog blocking main thread?

Published 11.05.2020
PyQt6

QWebEngine in Qt Designer

How to use QWebEngineView and other custom widgets in your Qt Designer layouts
PyQt5

Updating progressbar from QRunner

Published 11.05.2020

Using Qt Designer .ui Files with fbs for PyQt5 Packaging

Load your Qt Designer interfaces directly in fbs-based applications without converting to Python

Why are signals defined as class variables?

Understanding why PyQt6 and PySide6 signals live on the class, not in __init__
PyQt5

Clearing the canvas in QPainter

Published 10.05.2020
PyQt5

Elegant shutdown of running threads

Published 10.05.2020
PyQt5

How to Pass Additional Arguments to a QRunnable Worker Function

Solving common errors when passing parameters to threaded Worker functions in PyQt5
PyQt6

How to start/stop or pause running threads?

Control QRunnable workers in PyQt6 with start, stop, and pause functionality
PyQt5

Pause a running worker thread

Put a running task on hold, waiting for the UI
PyQt5

Resizing the QPainter canvas

Published 10.05.2020
PyQt5

Threading dict not callable error

Published 10.05.2020

What does @pyqtSlot() do?

Is the pyqtSlot decorator even necessary?

What does @Slot() do?

Is the Slot decorator even necessary?
PyQt6

Understanding QPainter Coordinates in PyQt6

How the coordinate system works for drawing on canvases in PyQt6
PyQt5

Why Omitting "if role == Qt.DisplayRole" Makes Your QAbstractTableModel Look Strange

Understanding Qt roles and why your table suddenly shows checkboxes, checkmarks, and filled squares

How to Check if a QLineEdit is Empty in Python

Empty strings are falsey in Python

AttributeError module 'time' has no attribute 'clock'

Fix PyQtGraph 'time.clock' error in Python 3.8+
PyQt5

How to Add Custom Widgets to Qt Designer

Use widget promotion to integrate your own Python widgets into Qt Designer layouts
PyQt5

Complex data in PyQt models

Published 07.05.2020
PyQt5

Customizing the Size of a PyQtGraph Plot

Control where and how large your PyQtGraph plots appear in your PyQt5 application
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