user: How do I use Bpy.Types.Greasepencillayermask in Blender? Include parameters, examples, warnings and best practices.

assistant: GreasePencilLayerMask(bpy_struct) - Blender Python API Contents Menu Expand Light mode Dark mode Auto light/dark, in light mode Auto light/dark, in dark mode Hide navigation sidebar Hide table of contents sidebar Skip to content Toggle site navigation sidebar Blender Python API Toggle Light / Dark / Auto color theme Toggle table of contents sidebar Blender Python API Documentation Quickstart API Overview API Reference Usage Best Practice Tips and Tricks Gotchas Toggle navigation of Gotchas Troubleshooting Errors & Crashes Python Threads are Not Supported Internal Data & Their Python Objects Using Operators Modes and Mesh Access Bones & Armatures File Paths & String Encoding Advanced Toggle navigation of Advanced Blender as a Python Module Change Log Application Modules Context Access (bpy.context) Data Access (bpy.data) Message Bus (bpy.msgbus) Operators (bpy.ops) Toggle navigation of Operators (bpy.ops) Action Operators Anim Operators Armature Operators Asset Operators Boid 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