use venv, and require >3.7...

Makefile

@@ -1,5 +1,5 @@
 MODULES=vlanmang
-VIRTUALENV?=virtualenv-3.7
+VIRTUALENV?=python3 -m venv
 
 test:
 	(ls $(MODULES)/*.py test_data.py test.creds | entr sh -c 'python -m coverage run -m unittest $(basename $(MODULES)) && coverage report --omit=p/\* -m -i')

setup.py

@@ -19,6 +19,7 @@ setup(name='vlanmang',
     ],
     url='https://www.funkthat.com/gitea/jmg/vlanmang',
     packages=[ 'vlanmang', ],
+    python_requires=">3.7",
     install_requires=[
         'pysnmp',
         'pysnmp-mibs',