python: how can I import this?

NameChanger

 -main.py
 -__init__.py

 ui
   -__init__.py
   -utils.py

 utils
   -__init__.py
   -file.py

I want to import NameChanger/utils/file.py in NameChanger/ui/utils.py.

so I tried this code from NameChanger.utils import file but this error occured ModuleNotFoundError: No module named 'NameChanger'

and I also tried from ...NameChanger.utils import file and this error ValueError: attempted relative import beyond top-level package

how can I solve this?
thank you for reading and sorry for my bad english

>Solution :

In ui/utils.py, use a relative import.

from . import utils.file

NameChanger itself is likely not in your search path (nor does it need to be). But since NameChanger is a package, the relative import in a module contained in a subpackage of NameChanger should work.

I originally suggested

from .utils import file

which would only work if utils really had file as a module-level attribute, which is generally not the case for a package.