ModuleNotFoundError: No module named 'sip'

Using wxPython 4.0.1 with Python3.6 running on ubuntu 18.04 and getting:
Traceback (most recent call last):
File “/home/robert/workspacePy3/PerFinance/src/Core/”, line 10, in
import wx
File “/home/robert/workspacePy3/PerFinance/venv/lib/python3.6/site-packages/wx/”, line 17, in
from wx.core import *
File “/home/robert/workspacePy3/PerFinance/venv/lib/python3.6/site-packages/wx/”, line 12, in
from ._core import *
ModuleNotFoundError: No module named ‘sip’

Where did your wxPython come from? If you installed the one from the Ubuntu repositories then you also need to install the python3-sip package.

I am using the wxPython from the ubuntu repositories. I will install the python3-sip package.
Thank you for your help.