Porting Python 2 code to Python 3

.gitlab-ci.yml

@@ -20,17 +20,26 @@ stages:
 before_script:
 - pip install -e .[dev]
 
+python3.6:
+  image: python:3.6
+  tags:
+  - passoft
+  stage: test
+  script:
+  - python -m unittest
 
-python2:
-  image: python:2.7
+python3.7:
+  image: python:3.7
   tags:
   - passoft
   stage: test
-  script: tox -e py27
+  script:
+  - python -m unittest
 
-python3:
-  image: python:3.6
+python3.8:
+  image: python:3.8
   tags:
   - passoft
   stage: test
-  script: tox -e py36
+  script:
+  - python -m unittest