Drop Python 2 Support

.travis.yml

@@ -24,7 +24,6 @@ services:
 
 matrix:
   include:
-    - python: 2.7
     - python: 3.5
     - python: 3.6
     - python: 3.7

appveyor.yml

@@ -18,10 +18,6 @@ environment:
 
   matrix:
 
-    - PYTHON: "C:\\Python27-x64"
-      PYTHON_VERSION: "2.7"
-      DISTUTILS_USE_SDK: "1"
-
     - PYTHON: "C:\\Python35-x64"
       PYTHON_VERSION: "3.5"
 

bench/compress_normal.py

@@ -1,11 +1,14 @@
-import numpy as np
 import sys
-sys.path.insert(0, '..')
-import zarr
-import line_profiler
 import timeit
+
+import numpy as np
+
+import line_profiler
+import zarr
 from zarr import blosc
 
+sys.path.insert(0, '..')
+
 # setup
 a = np.random.normal(2000, 1000, size=200000000).astype('u2')
 z = zarr.empty_like(a, chunks=1000000, compression='blosc', compression_opts=dict(cname='lz4', clevel=5, shuffle=2))

build.cmd

@@ -23,9 +23,7 @@ SET COMMAND_TO_RUN=%*
 SET WIN_SDK_ROOT=C:\Program Files\Microsoft SDKs\Windows
 
 SET MAJOR_PYTHON_VERSION="%PYTHON_VERSION:~0,1%"
-IF %MAJOR_PYTHON_VERSION% == "2" (
-    SET WINDOWS_SDK_VERSION="v7.0"
-) ELSE IF %MAJOR_PYTHON_VERSION% == "3" (
+IF %MAJOR_PYTHON_VERSION% == "3" (
     SET WINDOWS_SDK_VERSION="v7.1"
 ) ELSE (
     ECHO Unsupported Python version: "%MAJOR_PYTHON_VERSION%"

docs/conf.py

@@ -14,27 +14,15 @@
 # serve to show the default.
 
 
-import sys
 import os
-from mock import Mock as MagicMock
-
-
-PY2 = sys.version_info[0] == 2
-
-
-class Mock(MagicMock):
-    @classmethod
-    def __getattr__(cls, name):
-        return Mock()
-
-
-MOCK_MODULES = []
-if PY2:
-    MOCK_MODULES.append('lzma')
-
-
-sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
+import sys
 
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+import zarr
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -81,12 +69,6 @@ def __getattr__(cls, name):
 copyright = '2018, Zarr Developers'
 author = 'Zarr Developers'
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-# The short X.Y version.
-import zarr
 version = zarr.__version__
 # The full version, including alpha/beta/rc tags.
 release = zarr.__version__

docs/release.rst

@@ -15,6 +15,9 @@ Upcoming Release
   compatibility issue with testing against the Azure Storage
   Emulator. By :user:`alimanfoo`; :issue:`468`, :issue:`467`.
 
+* Removed support for Python 2.
+  By :user:`jhamman`; :issue:`393`, :issue:`470`.
+
 .. _release_2.3.2:
 
 2.3.2

setup.py

@@ -1,8 +1,7 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, division
-from setuptools import setup
 import sys
 
+from setuptools import setup
 
 DESCRIPTION = 'An implementation of chunked, compressed, ' \
               'N-dimensional arrays for Python.'
@@ -17,11 +16,6 @@
     'numcodecs>=0.6.2',
 ]
 
-if sys.version_info < (3, 5):
-    dependencies.append('scandir')
-if sys.version_info < (3, 3) and sys.platform == "win32":
-    dependencies.append('pyosreplace')
-
 setup(
     name='zarr',
     description=DESCRIPTION,
@@ -35,6 +29,7 @@
         'setuptools>18.0',
         'setuptools-scm>1.5.4'
     ],
+    python_requires='>=3.5',
     install_requires=dependencies,
     package_dir={'': '.'},
     packages=['zarr', 'zarr.tests'],
@@ -47,8 +42,6 @@
         'Programming Language :: Python',
         'Topic :: Software Development :: Libraries :: Python Modules',
         'Operating System :: Unix',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',

tox.ini

@@ -4,15 +4,12 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, py35, py36, py37-npy{115,116,latest}, docs
+envlist = py35, py36, py37-npy{115,116,latest}, docs
 
 [testenv]
 install_command = pip install --no-binary=numcodecs {opts} {packages}
 setenv =
     PYTHONHASHSEED = 42
-    # hooks for coverage exclusions based on Python major version
-    py35,py36,py37: PY_MAJOR_VERSION = py3
-    py27: PY_MAJOR_VERSION = py2
 passenv =
     ZARR_TEST_ABS
     ZARR_TEST_MONGO
@@ -21,24 +18,23 @@ commands =
     # clear out any data files generated during tests
     python -c 'import glob; import shutil; import os; [(shutil.rmtree(d) if os.path.isdir(d) else os.remove(d) if os.path.isfile(d) else None) for d in glob.glob("./example*")]'
     # main unit test runner
-    py27,py35,py36: pytest -v --cov=zarr --cov-config=.coveragerc zarr
+    py35,py36: pytest -v --cov=zarr --cov-config=.coveragerc zarr
     # don't collect coverage when running older numpy versions
     py37-{npy115,npy116}: pytest -v zarr
     # collect coverage and run doctests under py37
     py37-npylatest: pytest -v --cov=zarr --cov-config=.coveragerc --doctest-plus zarr --remote-data
     # generate a coverage report
-    py27,py35,py36,py37-npylatest: coverage report -m
+    py35,py36,py37-npylatest: coverage report -m
     # run doctests in the tutorial and spec
     py37-npylatest: python -m doctest -o NORMALIZE_WHITESPACE -o ELLIPSIS docs/tutorial.rst docs/spec/v2.rst
     # pep8 checks
     py37-npylatest: flake8 zarr
     # print environment for debugging
     pip freeze
 deps =
-    py27: backports.lzma
     py37-npy115: numpy==1.15.4
     py37-npy116: numpy==1.16.4
-    py27,py35,py36,py37-npylatest: -rrequirements_dev_numpy.txt
+    py35,py36,py37-npylatest: -rrequirements_dev_numpy.txt
     -rrequirements_dev_minimal.txt
     -rrequirements_dev_optional.txt
 

zarr/__init__.py

@@ -1,20 +1,19 @@
 # -*- coding: utf-8 -*-
 # flake8: noqa
-from __future__ import absolute_import, print_function, division
-
-
-from zarr.core import Array
-from zarr.creation import (empty, zeros, ones, full, array, empty_like, zeros_like,
-                           ones_like, full_like, open_array, open_like, create)
-from zarr.storage import (DictStore, MemoryStore, DirectoryStore, ZipStore, TempStore,
-                          NestedDirectoryStore, DBMStore, LMDBStore, SQLiteStore,
-                          LRUStoreCache, ABSStore, RedisStore, MongoDBStore)
-from zarr.hierarchy import group, open_group, Group
-from zarr.sync import ThreadSynchronizer, ProcessSynchronizer
 from zarr.codecs import *
-from zarr.convenience import (open, save, save_array, save_group, load, copy_store,
-                              copy, copy_all, tree, consolidate_metadata,
-                              open_consolidated)
+from zarr.convenience import (consolidate_metadata, copy, copy_all, copy_store,
+                              load, open, open_consolidated, save, save_array,
+                              save_group, tree)
+from zarr.core import Array
+from zarr.creation import (array, create, empty, empty_like, full, full_like,
+                           ones, ones_like, open_array, open_like, zeros,
+                           zeros_like)
+from zarr.errors import CopyError, MetadataError
+from zarr.hierarchy import Group, group, open_group
 from zarr.n5 import N5Store
-from zarr.errors import CopyError, MetadataError, PermissionError
+from zarr.storage import (ABSStore, DBMStore, DictStore, DirectoryStore,
+                          LMDBStore, LRUStoreCache, MemoryStore, MongoDBStore,
+                          NestedDirectoryStore, RedisStore, SQLiteStore,
+                          TempStore, ZipStore)
+from zarr.sync import ProcessSynchronizer, ThreadSynchronizer
 from zarr.version import version as __version__

zarr/attrs.py

@@ -1,9 +1,6 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, division
+from collections.abc import MutableMapping
 
-
-from zarr.compat import MutableMapping
-from zarr.errors import PermissionError
 from zarr.meta import parse_metadata
 from zarr.util import json_dumps
 

zarr/codecs.py

@@ -1,7 +1,4 @@
 # -*- coding: utf-8 -*-
 # flake8: noqa
-from __future__ import absolute_import, print_function, division
-
-
 from numcodecs import *
 from numcodecs.registry import codec_registry

zarr/convenience.py

@@ -1,20 +1,20 @@
 # -*- coding: utf-8 -*-
 """Convenience functions for storing and loading data."""
-from __future__ import absolute_import, print_function, division
 import io
-import re
 import itertools
-
+import re
+from collections.abc import Mapping
 
 from zarr.core import Array
-from zarr.creation import (open_array, normalize_store_arg,
-                           array as _create_array)
-from zarr.hierarchy import open_group, group as _create_group, Group
-from zarr.storage import contains_array, contains_group
-from zarr.errors import err_path_not_found, CopyError
-from zarr.util import normalize_storage_path, TreeViewer, buffer_size
-from zarr.compat import Mapping, PY2, text_type
+from zarr.creation import array as _create_array
+from zarr.creation import normalize_store_arg, open_array
+from zarr.errors import CopyError, err_path_not_found
+from zarr.hierarchy import Group
+from zarr.hierarchy import group as _create_group
+from zarr.hierarchy import open_group
 from zarr.meta import json_dumps, json_loads
+from zarr.storage import contains_array, contains_group
+from zarr.util import TreeViewer, buffer_size, normalize_storage_path
 
 
 # noinspection PyShadowingBuiltins
@@ -451,9 +451,6 @@ def __exit__(self, *args):
     def __call__(self, *args, **kwargs):
         if self.log_file is not None:
             kwargs['file'] = self.log_file
-            if PY2:  # pragma: py3 no cover
-                # expect file opened in text mode, need to adapt message
-                args = [text_type(a) for a in args]
             print(*args, **kwargs)
             if hasattr(self.log_file, 'flush'):
                 # get immediate feedback