It looks like you are looking for a specific resource: the (possibly for QGIS 3) in PDF format, and you want a report or confirmation on whether it works or is available.
If you are specifically looking for the "3" version (QGIS 3.x), this book is critical. pyqgis programmer 39s guide 3 pdf work
Who it's for
The is the definitive roadmap for anyone looking to bridge the gap between simple GIS tasks and powerful, automated spatial workflows [2]. Whether you are a data scientist or a GIS specialist, mastering the Python API for QGIS opens doors to building custom plugins, automating map production, and developing standalone applications [2, 3]. PyQGIS Programmer’s Guide It looks like you are
The book is structured to lead you from using the console to building full applications. QGIS PyQGIS Cookbook (Official) QGIS Layout Export API
Now open your terminal, fire up the QGIS Python console, and start scripting your PDF workflow today.