Register Multiple Classes I'm trying to register multiple classes at the same time like this:
I got it working like this  

def register():
    bpy.utils.register_class(VIEW3D_PIE_SPECIALS)
    bpy.utils.register_class(SMART_BOOLEAN_ADD)
    bpy.utils.register_class(SMART_BOOLEAN_SUBTRACT)
    bpy.utils.register_class(SMART_BOOLEAN_SLICE)


But I want it to automatically register all classes in my file

Here is my attempt which isn't working yet:

classes = ('VIEW3D_PIE_SPECIALS','SMART_BOOLEAN_ADD','SMART_BOOLEAN_SUBTRACT','SMART_BOOLEAN_SLICE')


def register():
    for cls in classes:
        return 'bpy.utils.register_class('+(cls)+')'

def unregister():
    for cls in classes:
        return 'bpy.utils.unregister_class('+(cls)+')'
You're looking for register_module:

def register():
    bpy.utils.register_module(__name__)

def unregister():
    bpy.utils.unregister_module(__name__)


It grabs all the relevant classes in the file.