[compat] Drop support of PY2

Allowing to drop six requirement

Author: Bastien Vallet

docs/conf.py

@@ -83,7 +83,6 @@
 
 doctest_global_setup = dedent(
     """
-    from __future__ import print_function
     from jsonschema import *
 """
 )

json/bin/jsonschema_suite

@@ -1,5 +1,4 @@
 #! /usr/bin/env python3
-from __future__ import print_function
 from pprint import pformat
 import argparse
 import errno

jsonschema/cli.py

@@ -2,7 +2,6 @@
 The ``jsonschema`` command line.
 """
 
-from __future__ import absolute_import
 from textwrap import dedent
 import argparse
 import errno

jsonschema/validators.py

@@ -1,15 +1,11 @@
 """
 Creation and extension of validators, with implementations for existing drafts.
 """
-from __future__ import division
-
 from warnings import warn
 import contextlib
 import json
 import numbers
 
-from six import add_metaclass
-
 from jsonschema import (
     _legacy_validators,
     _types,
@@ -247,8 +243,7 @@ def create(
         else:
             _created_with_default_types = None
 
-    @add_metaclass(_DefaultTypesDeprecatingMetaClass)
-    class Validator(object):
+    class Validator(metaclass=_DefaultTypesDeprecatingMetaClass):
 
         VALIDATORS = dict(validators)
         META_SCHEMA = dict(meta_schema)

setup.cfg

@@ -15,8 +15,6 @@ classifiers =
     License :: OSI Approved :: MIT License
     Operating System :: OS Independent
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
@@ -31,7 +29,6 @@ install_requires =
     functools32;python_version<'3'
     importlib_metadata;python_version<'3.8'
     pyrsistent>=0.14.0
-    six>=1.11.0
 
 [options.extras_require]
 format =

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{36,37,38,py2,py3}-{build,tests,tests_nongpl},
+    py{36,37,38,py3}-{build,tests,tests_nongpl},
     demo
     readme
     safety