user: What is B and how is it used in Blender Python scripting?

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[(bpy.types.VIEW3D_AST_brush_gpencil_vertex class method)](bpy.types.VIEW3D_AST_brush_gpencil_vertex.html#bpy.types.VIEW3D_AST_brush_gpencil_vertex.bl_rna_get_subclass)   - [(bpy.types.VIEW3D_AST_brush_gpencil_weight class method)](bpy.types.VIEW3D_AST_brush_gpencil_weight.html#bpy.types.VIEW3D_AST_brush_gpencil_weight.bl_rna_get_subclass)   - [(bpy.types.VIEW3D_AST_brush_sculpt class method)](bpy.types.VIEW3D_AST_brush_sculpt.html#bpy.types.VIEW3D_AST_brush_sculpt.bl_rna_get_subclass)   - [(bpy.types.VIEW3D_AST_brush_sculpt_curves class method)](bpy.types.VIEW3D_AST_brush_sculpt_curves.html#bpy.types.VIEW3D_AST_brush_sculpt_curves.bl_rna_get_subclass)   - [(bpy.types.VIEW3D_AST_brush_texture_paint class method)](bpy.types.VIEW3D_AST_brush_texture_paint.html#bpy.types.VIEW3D_AST_brush_texture_paint.bl_rna_get_subclass)   - [(bpy.types.VIEW3D_AST_brush_vertex_paint class method)](bpy.types.VIEW3D