How to import scripted modules with extension .pyw?

recently I try to run on linux (debian 9) an app that I am programming on windows with python3 and PyQt5

The problem, I can not import modules from any script with extension .pyw

I explain myself better.

I have the files in the following folder

~/Documentos/Codigo/codigo

The files are

__pycache__

ModuloPy.py

ModuloPyw.pyw

ModuloPyw.ui

when executing the moduloPy.py

~/Documentos/Codigo/codigo$ python3 moduloPy.py
Traceback (most recent call last):
  File "moduloPy.py", line 1, in <module>
    from moduloPyw import *
ImportError: No module named 'moduloPyw'

The first three lines of moduloPy.py are the following

#Principal
import sys
from moduloPyw import *

I clarify that I installed PyQt5 correctly and I did not have errors (at least it is I think)

~$ python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04) 
[GCC 6.3.0 20170118] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import PyQt5
>>> 

I really did not find anything similar on the internet.

Thank you.