Remove Python 2.x compatibility

.pylintrc

@@ -52,8 +52,7 @@ disable=consider-using-f-string,
         too-few-public-methods,
         too-many-lines,
         too-many-public-methods,
-        unidiomatic-typecheck,
-        useless-object-inheritance
+        unidiomatic-typecheck
 
 
 [REPORTS]

.travis.yml

@@ -1,6 +1,5 @@
 language: python
 python:
-  - "2.7"
   - "3.6"
   - "pypy3.5"
 script:

Makefile

@@ -1,12 +1,6 @@
-all: test lint coverage build docs
+all: test lint coverage docs build
 
-test: test2 test3
-
-test2: test.py pygtrie.py
-	python2 $<
-	python2 -m doctest pygtrie.py
-
-test3: test.py pygtrie.py
+test: test.py pygtrie.py
 	python3 -X dev $<
 	python3 -X dev -m doctest pygtrie.py
 
@@ -15,14 +9,12 @@ lint: .pylintrc pygtrie.py test.py example.py
 	"$$lint" --rcfile $^
 
 coverage: test.py pygtrie.py
-	cov=$$(which python3-coverage 2>/dev/null) || \
-	cov=$$(which python-coverage) && \
-	"$$cov" run $< && "$$cov" report -m
+	python3-coverage run $< && python3-coverage report -m
 
 build:
 	python3 -m build -swn
 
 docs:
 	python3 setup.py build_doc
 
-.PHONY: all test test2 test3 lint coverage build docs
+.PHONY: all test lint coverage build docs