Mastering GUI Programming with Python

Saving settings with QSettings

Applications of any reasonable size are likely to accumulate settings that need to be stored between sessions. Saving these settings usually involves a lot of tedious work with file operations and data serialization, and becomes even more complex when we want to do it in a way that works well across platforms. Qt rescues us from this work with its QtCore.QSettings class.

The QSettings class is a simple key-value data store that is automatically persisted in a platform-appropriate way. For example, on Windows, the settings are stored in the registry database, while on Linux they are placed in a plain-text configuration file under ~/.config.

Let's replace the settings dict object we created in our text editor ...