.pyt files are a file type used by the ESRI ArcGIS software to describe Python toolboxes. ArcGIS is a commonly used, commercial GIS (Geographic Information Systems) software. One way of extending this software is by using custom tools, which can be contained in native (.tbx) or Python (.pyt) toolboxes.

Python toolboxes are text files containing regular Python code, but use the .pyt extension to allow ArcGIS to identify them. It would be great if the .pyt file extension could be included as one used by the VSCode Python extension.