Redhat – Python module import from a WSGI script fails on RedHat server

Here is a minimal WSGI script, importing a custom python module.

It runs fine on a development environment (Mint 18.1, Apache 2.4.18, libapache2-mod-wsgi-py3), but fails when deployed to a test server (RHEL 8.0, Httpd/Apache 2.4.37, python3-mod_wsgi).

Here is the apache config block:

<VirtualHost *:80>
      ServerName localhost
      ServerAdmin admin@localhost
      WSGIDaemonProcess MyApp
      WSGIProcessGroup MyApp
      WSGIScriptAlias /test /var/www/wsgi/wsgiapp.wsgi
      <Directory /var/www/wsgi/>
         Require all granted
      </Directory>
      LogLevel warn
</VirtualHost>

The WSGI script (/var/www/wsgi/wsgiapp.wsgi):

#!/usr/bin/python3
import sys 
path = '/srv/git/myproject/mymodule/'
if path not in str(sys.path):
   sys.path.insert(0, path)
from hellofunc import hello as application

The file to be imported (/srv/git/myproject/mymodule/hellofunc.py):

def hello(environ, start_response):
   start_response('200 OK', [('Content-type', 'text/plain'),('Content-Length','6')])
   return [b'Hello']

The Apache error log on the RedHat server:

mod_wsgi (pid=1060): Failed to exec Python script file
'/var/www/wsgi/wsgiapp.wsgi'. mod_wsgi (pid=1060): Exception occurred
processing WSGI script '/var/www/wsgi/wsgiapp.wsgi'. Traceback (most
recent call last): File "/var/www/wsgi/wsgiapp.wsgi", line 7, in

from hellofunc import hello as application ModuleNotFoundError: No module named 'hellofunc'

The file permissions have been arranged so that the apache/www-data groups can read/execute the files on each server.
Only distro packages have been used. Nothing built from source, nor installed through Python pip.