Obstrusive window on syntastic from vim for python

Syntastic is raising an error each ":w" refered to Python3 class defintion. I also tryed to disabled messages window without sucess using

let g:syntastic_always_populate_loc_list = 1
let g:syntastic_auto_loc_list = 1
let g:syntastic_check_on_open = 0
let g:syntastic_check_on_wq = 0

The class definition raising the error is something like

class SomeClass(metaclass=PoolMeta):
    pass

The question is how coudl I disable that window in order to prevent raising that wrong alerts?

Image attached

You probably want to set syntastic_auto_loc_list to 0 or 2.

syntastic_auto_loc_list

Type: integer

Default: 2

Use this option to tell syntastic to automatically open and/or close the location-list (see syntastic-error-window).

When set to 0 the error window will be neither opened nor closed automatically.

let g:syntastic_auto_loc_list = 0

When set to 1 the error window will be automatically opened when errors are detected, and closed when none are detected.

let g:syntastic_auto_loc_list = 1

When set to 2 the error window will be automatically closed when no errors are detected, but not opened automatically.

let g:syntastic_auto_loc_list = 2

When set to 3 the error window will be automatically opened when errors are detected, but not closed automatically.

let g:syntastic_auto_loc_list = 3