Understanding pdb result

The module begins this way:

#!/usr/bin/env python3

import sys, os
import pdb
import wx

   When pdb is invoked and I step through the code I get these results:

$ python3 -m pdb openEDMS.py

/home/rshepard/development/openEDMS/openEDMS.py(8)<module>()

-> """
(Pdb) s

/home/rshepard/development/openEDMS/openEDMS.py(10)<module>()

-> import sys, os
(Pdb) s

/home/rshepard/development/openEDMS/openEDMS.py(11)<module>()

-> import pdb
(Pdb)

/home/rshepard/development/openEDMS/openEDMS.py(12)<module>()

-> import wx
(Pdb) --Call--

<frozen importlib._bootstrap>(966)_find_and_load()

(Pdb)

   My web search suggests that I need to import importlib, but doing so does
not change the results.

   Please pass me a pointer to a resource that teaches me how to avoid this
error.

TIA,

Rich

Please ignore; this is not the appropriate mail list for this question.
I've asked on python-list@python.org.

Rich

···

On Fri, 27 Apr 2018, Rich Shepard wrote:

Please pass me a pointer to a resource that teaches me how to avoid this
error.