Part of kiwi
| Function | get_default_getter | Obtains from model a callable through which attr_name can be | 
| Function | get_default_setter | Obtains from model a callable through which attr_name can be | 
| Class | CacheControl | Undocumented | 
| Class | _AttrUnset | Undocumented | 
| Class | DefaultValue | This can be raised in kgetattr accessors to indicate that the default | 
| Function | kgetattr_guard | Undocumented | 
| Function | ksetattr_guard | Undocumented | 
| Function | kgetattr | Returns the value associated with the attribute in model | 
| Function | ksetattr | Set the value associated with the attribute in model | 
| Function | enable_attr_cache | Enables the use of the kgetattr cache when using Python | 
| Function | clear_attr_cache | Clears the kgetattr cache. It must be called repeatedly to |