GNU Data Language (GDL) is a free IDL (Interactive Data Language) compatible incremental compiler. It has full syntax compatibility with IDL 7.1. IDL is a registered trademark of ITT Visual Information Solutions. From IDL 8.0, the following language elements are supported:

* FOREACH loop
* negative array indices
* garbage collection pointers and objects
* call methods on an object using "." (e. g. `object.aMemberProcedure,arg1`)
The file input output system is fully implemented. GUI support (widgets) is officially provided, but it's not complete yet.

This package contains the Python library/interface.