Drop Python 2

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,7 +3,6 @@
 TODO:
 * [ ] Unit tests and/or doctests in docstrings
 * [ ] ``tox -e py38`` passes locally
-* [ ] ``tox -e py27`` passes locally
 * [ ] Docstrings and API docs for any new/modified user-facing classes and functions
 * [ ] Changes documented in docs/release.rst
 * [ ] ``tox -e docs`` passes locally

.travis.yml

@@ -12,9 +12,6 @@ addons:
 
 matrix:
   include:
-    - os: linux
-      language: python
-      python: 2.7
     - os: linux
       language: python
       python: 3.5
@@ -30,8 +27,9 @@ matrix:
       python: 3.8
       dist: xenial
       sudo: true
-    - os: osx
-      language: generic
+    # Skip OSX build for now
+    # - os: osx
+    #   language: generic
 
 install:
   - pip install -U tox-travis coveralls pip setuptools wheel pytest

appveyor.yml

@@ -12,10 +12,6 @@ environment:
 
   matrix:
 
-    - PYTHON: "C:\\Python27-x64"
-      PYTHON_VERSION: "2.7"
-      DISTUTILS_USE_SDK: "1"
-
     - PYTHON: "C:\\Python35-x64"
       PYTHON_VERSION: "3.5"
 

docs/conf.py

@@ -16,16 +16,7 @@
 
 import sys
 import os
-
-
-PY2 = sys.version_info[0] == 2
-
-
-if PY2:  # pragma: py3 no cover
-    from mock import Mock as MagicMock
-else:    # pragma: py2 no cover
-    from unittest.mock import Mock as MagicMock
-
+from unittest.mock import Mock as MagicMock
 
 class Mock(MagicMock):
     @classmethod
@@ -34,10 +25,6 @@ def __getattr__(cls, name):
 
 
 MOCK_MODULES = ['msgpack']
-if PY2:
-    MOCK_MODULES.append('lzma')
-
-
 sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
 
 

docs/release.rst

@@ -1,6 +1,12 @@
 Release notes
 =============
 
+Upcoming Release
+----------------
+
+* Drop support for Python 2.
+  By :user:`James Bourbeau <jrbourbeau>`, :issue:`220`.
+
 
 .. _release_0.6.4:
 

numcodecs/__init__.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # flake8: noqa
 """Numcodecs is a Python package providing buffer compression and
 transformation codecs for use in data storage and communication
@@ -18,7 +17,6 @@
 
 """
 
-from __future__ import absolute_import, print_function, division
 import multiprocessing
 import atexit
 

numcodecs/abc.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """This module defines the :class:`Codec` base class, a common interface for
 all codec classes.
 
@@ -29,10 +28,9 @@
 other and vice versa.
 
 """
-from __future__ import absolute_import, print_function, division
 
 
-class Codec(object):
+class Codec:
     """Codec abstract base class."""
 
     # override in sub-class
@@ -117,10 +115,6 @@ def __eq__(self, other):
         except AttributeError:
             return False
 
-    def __ne__(self, other):
-        # only needed for PY2
-        return not self == other
-
     def __repr__(self):
 
         # override in sub-class if need special representation
@@ -129,7 +123,7 @@ def __repr__(self):
         # parameters and valid keyword arguments to constructor function
 
         r = '%s(' % type(self).__name__
-        params = ['%s=%r' % (k, getattr(self, k))
+        params = ['{}={!r}'.format(k, getattr(self, k))
                   for k in sorted(self.__dict__)
                   if not k.startswith('_')]
         r += ', '.join(params) + ')'

numcodecs/astype.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, division
-
 import numpy as np
 
 from .abc import Codec
@@ -79,7 +76,7 @@ def get_config(self):
 
     def __repr__(self):
         return (
-            '%s(encode_dtype=%r, decode_dtype=%r)' % (
+            '{}(encode_dtype={!r}, decode_dtype={!r})'.format(
                 type(self).__name__,
                 self.encode_dtype.str,
                 self.decode_dtype.str