Drop support for Python 2.6, removing lots of compatibility code for a leaner, cleaner codebase. Fixes #878.

Author: jaraco

.travis.yml

@@ -1,6 +1,5 @@
 language: python
 python:
-  - 2.6
   - 2.7
   - 3.3
   - 3.4

CHANGES.rst

@@ -1,3 +1,9 @@
+v31.0.0
+-------
+
+* #878: Drop support for Python 2.6. Python 2.6 users should
+  rely on 'setuptools < 31dev'.
+
 v30.3.0
 -------
 

README.rst

@@ -17,9 +17,7 @@ The recommended way to bootstrap setuptools on any system is to download
 operating systems have different recommended techniques to accomplish this
 basic routine, so below are some examples to get you started.
 
-Setuptools requires Python 2.6 or later. To install setuptools
-on Python 2.4 or Python 2.5, use the `bootstrap script for Setuptools 1.x
-<https://github.com/raw/pypa/setuptools/bootstrap-py24/ez_setup.py>`_.
+Setuptools requires Python 3.3 or later (or Python 2.7).
 
 The link provided to ez_setup.py is a bookmark to bootstrap script for the
 latest known stable release.

docs/easy_install.txt

@@ -35,7 +35,7 @@ Please see the `setuptools PyPI page <https://pypi.python.org/pypi/setuptools>`_
 for download links and basic installation instructions for each of the
 supported platforms.
 
-You will need at least Python 2.6.  An ``easy_install`` script will be
+You will need at least Python 3.3 or 2.7.  An ``easy_install`` script will be
 installed in the normal location for Python scripts on your platform.
 
 Note that the instructions on the setuptools PyPI page assume that you are
@@ -305,8 +305,7 @@ Regardless of the technique used, the script(s) will be installed to a Scripts
 directory (by default in the Python installation directory). It is recommended
 for EasyInstall that you ensure this directory is in the PATH environment
 variable. The easiest way to ensure the Scripts directory is in the PATH is
-to run ``Tools\Scripts\win_add2path.py`` from the Python directory (requires
-Python 2.6 or later).
+to run ``Tools\Scripts\win_add2path.py`` from the Python directory.
 
 Note that instead of changing your ``PATH`` to include the Python scripts
 directory, you can also retarget the installation location for scripts so they
@@ -987,21 +986,20 @@ The following section lists only the easiest and most relevant approaches [1]_.
 
 `Use "virtualenv"`_
 
-.. [1] There are older ways to achieve custom installation using various ``easy_install`` and ``setup.py install`` options, combined with ``PYTHONPATH`` and/or ``PYTHONUSERBASE`` alterations, but all of these are effectively deprecated by the User scheme brought in by `PEP-370`_ in Python 2.6.
+.. [1] There are older ways to achieve custom installation using various ``easy_install`` and ``setup.py install`` options, combined with ``PYTHONPATH`` and/or ``PYTHONUSERBASE`` alterations, but all of these are effectively deprecated by the User scheme brought in by `PEP-370`_.
 
 .. _PEP-370: http://www.python.org/dev/peps/pep-0370/
 
 
 Use the "--user" option
 ~~~~~~~~~~~~~~~~~~~~~~~
-With Python 2.6 came the User scheme for installation, which means that all
-python distributions support an alternative install location that is specific to a user [2]_ [3]_.
+Python provides a User scheme for installation, which means that all
+python distributions support an alternative install location that is specific to a user [3]_.
 The Default location for each OS is explained in the python documentation
 for the ``site.USER_BASE`` variable.  This mode of installation can be turned on by
 specifying the ``--user`` option to ``setup.py install`` or ``easy_install``.
 This approach serves the need to have a user-specific stash of packages.
 
-.. [2] Prior to Python2.6, Mac OS X offered a form of the User scheme. That is now subsumed into the User scheme introduced in Python 2.6.
 .. [3] Prior to the User scheme, there was the Home scheme, which is still available, but requires more effort than the User scheme to get packages recognized.
 
 Use the "--user" option and customize "PYTHONUSERBASE"

docs/formats.txt

@@ -110,7 +110,7 @@ the need to create a directory just to store one file.  This option is
 other metadata.  (In fact, setuptools itself never generates
 ``.egg-info`` files, either; the support for using files was added so
 that the requirement could easily be satisfied by other tools, such
-as the distutils in Python 2.5).
+as distutils).
 
 In addition to the ``PKG-INFO`` file, an egg's metadata directory may
 also include files and directories representing various forms of

docs/pkg_resources.txt

@@ -622,8 +622,8 @@ Requirements Parsing
     The "markers" in a requirement are used to specify when a requirement
     should be installed -- the requirement will be installed if the marker
     evaluates as true in the current environment. For example, specifying
-    ``argparse;python_version<"2.7"`` will not install in an Python 2.7 or 3.3
-    environment, but will in a Python 2.6 environment.
+    ``argparse;python_version<"3.0"`` will not install in an Python 3
+    environment, but will in a Python 2 environment.
 
 ``Requirement`` Methods and Attributes
 --------------------------------------
@@ -1660,19 +1660,7 @@ PEP 302 Utilities
 -----------------
 
 ``get_importer(path_item)``
-    Retrieve a PEP 302 "importer" for the given path item (which need not
-    actually be on ``sys.path``).  This routine simulates the PEP 302 protocol
-    for obtaining an "importer" object.  It first checks for an importer for
-    the path item in ``sys.path_importer_cache``, and if not found it calls
-    each of the ``sys.path_hooks`` and caches the result if a good importer is
-    found.  If no importer is found, this routine returns an ``ImpWrapper``
-    instance that wraps the builtin import machinery as a PEP 302-compliant
-    "importer" object.  This ``ImpWrapper`` is *not* cached; instead a new
-    instance is returned each time.
-
-    (Note: When run under Python 2.5, this function is simply an alias for
-    ``pkgutil.get_importer()``, and instead of ``pkg_resources.ImpWrapper``
-    instances, it may return ``pkgutil.ImpImporter`` instances.)
+    A deprecated alias for ``pkgutil.get_importer()``
 
 
 File/Path Utilities

docs/setuptools.txt

@@ -3,7 +3,7 @@ Building and Distributing Packages with Setuptools
 ==================================================
 
 ``Setuptools`` is a collection of enhancements to the Python ``distutils``
-(for Python 2.6 and up) that allow developers to more easily build and
+that allow developers to more easily build and
 distribute Python packages, especially ones that have dependencies on other
 packages.
 

pkg_resources/__init__.py

@@ -1611,7 +1611,7 @@ def build(cls, path):
         Use a platform-specific path separator (os.sep) for the path keys
         for compatibility with pypy on Windows.
         """
-        with ContextualZipFile(path) as zfile:
+        with zipfile.ZipFile(path) as zfile:
             items = (
                 (
                     name.replace('/', os.sep),
@@ -1644,26 +1644,6 @@ def load(self, path):
         return self[path].manifest
 
 
-class ContextualZipFile(zipfile.ZipFile):
-    """
-    Supplement ZipFile class to support context manager for Python 2.6
-    """
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, type, value, traceback):
-        self.close()
-
-    def __new__(cls, *args, **kwargs):
-        """
-        Construct a ZipFile or ContextualZipFile as appropriate
-        """
-        if hasattr(zipfile.ZipFile, '__exit__'):
-            return zipfile.ZipFile(*args, **kwargs)
-        return super(ContextualZipFile, cls).__new__(cls)
-
-
 class ZipProvider(EggProvider):
     """Resource support for zips and eggs"""
 
@@ -1861,7 +1841,7 @@ def get_metadata(self, name):
         return metadata
 
     def _warn_on_replacement(self, metadata):
-        # Python 2.6 and 3.2 compat for: replacement_char = '�'
+        # Python 2.7 compat for: replacement_char = '�'
         replacement_char = b'\xef\xbf\xbd'.decode('utf-8')
         if replacement_char in metadata:
             tmpl = "{self.path} could not be properly decoded in UTF-8"

pkg_resources/api_tests.txt

@@ -385,10 +385,10 @@ Environment Markers
     >>> em("sys_platform=='win32'") == (sys.platform=='win32')
     True
 
-    >>> em("python_version >= '2.6'")
+    >>> em("python_version >= '2.7'")
     True
 
-    >>> em("python_version > '2.5'")
+    >>> em("python_version > '2.6'")
     True
 
     >>> im("implementation_name=='cpython'")

pkg_resources/tests/test_resources.py

@@ -206,12 +206,10 @@ def test_marker_evaluation_with_extras(self):
         """Extras are also evaluated as markers at resolution time."""
         ad = pkg_resources.Environment([])
         ws = WorkingSet([])
-        # Metadata needs to be native strings due to cStringIO behaviour in
-        # 2.6, so use str().
         Foo = Distribution.from_filename(
             "/foo_dir/Foo-1.2.dist-info",
-            metadata=Metadata(("METADATA", str("Provides-Extra: baz\n"
-                               "Requires-Dist: quux; extra=='baz'")))
+            metadata=Metadata(("METADATA", "Provides-Extra: baz\n"
+                               "Requires-Dist: quux; extra=='baz'"))
         )
         ad.add(Foo)
         assert list(ws.resolve(parse_requirements("Foo"), ad)) == [Foo]
@@ -224,12 +222,10 @@ def test_marker_evaluation_with_extras_normlized(self):
         """Extras are also evaluated as markers at resolution time."""
         ad = pkg_resources.Environment([])
         ws = WorkingSet([])
-        # Metadata needs to be native strings due to cStringIO behaviour in
-        # 2.6, so use str().
         Foo = Distribution.from_filename(
             "/foo_dir/Foo-1.2.dist-info",
-            metadata=Metadata(("METADATA", str("Provides-Extra: baz-lightyear\n"
-                               "Requires-Dist: quux; extra=='baz-lightyear'")))
+            metadata=Metadata(("METADATA", "Provides-Extra: baz-lightyear\n"
+                               "Requires-Dist: quux; extra=='baz-lightyear'"))
         )
         ad.add(Foo)
         assert list(ws.resolve(parse_requirements("Foo"), ad)) == [Foo]
@@ -241,14 +237,12 @@ def test_marker_evaluation_with_extras_normlized(self):
     def test_marker_evaluation_with_multiple_extras(self):
         ad = pkg_resources.Environment([])
         ws = WorkingSet([])
-        # Metadata needs to be native strings due to cStringIO behaviour in
-        # 2.6, so use str().
         Foo = Distribution.from_filename(
             "/foo_dir/Foo-1.2.dist-info",
-            metadata=Metadata(("METADATA", str("Provides-Extra: baz\n"
+            metadata=Metadata(("METADATA", "Provides-Extra: baz\n"
                                "Requires-Dist: quux; extra=='baz'\n"
                                "Provides-Extra: bar\n"
-                               "Requires-Dist: fred; extra=='bar'\n")))
+                               "Requires-Dist: fred; extra=='bar'\n"))
         )
         ad.add(Foo)
         quux = Distribution.from_filename("/foo_dir/quux-1.0.dist-info")
@@ -261,22 +255,20 @@ def test_marker_evaluation_with_multiple_extras(self):
     def test_marker_evaluation_with_extras_loop(self):
         ad = pkg_resources.Environment([])
         ws = WorkingSet([])
-        # Metadata needs to be native strings due to cStringIO behaviour in
-        # 2.6, so use str().
         a = Distribution.from_filename(
             "/foo_dir/a-0.2.dist-info",
-            metadata=Metadata(("METADATA", str("Requires-Dist: c[a]")))
+            metadata=Metadata(("METADATA", "Requires-Dist: c[a]"))
         )
         b = Distribution.from_filename(
             "/foo_dir/b-0.3.dist-info",
-            metadata=Metadata(("METADATA", str("Requires-Dist: c[b]")))
+            metadata=Metadata(("METADATA", "Requires-Dist: c[b]"))
         )
         c = Distribution.from_filename(
             "/foo_dir/c-1.0.dist-info",
-            metadata=Metadata(("METADATA", str("Provides-Extra: a\n"
+            metadata=Metadata(("METADATA", "Provides-Extra: a\n"
                                "Requires-Dist: b;extra=='a'\n"
                                "Provides-Extra: b\n"
-                               "Requires-Dist: foo;extra=='b'")))
+                               "Requires-Dist: foo;extra=='b'"))
         )
         foo = Distribution.from_filename("/foo_dir/foo-0.1.dist-info")
         for dist in (a, b, c, foo):

setup.py

@@ -145,7 +145,6 @@ def pypi_link(pkg_filename):
         Intended Audience :: Developers
         License :: OSI Approved :: MIT License
         Operating System :: OS Independent
-        Programming Language :: Python :: 2.6
         Programming Language :: Python :: 2.7
         Programming Language :: Python :: 3
         Programming Language :: Python :: 3.3
@@ -156,7 +155,7 @@ def pypi_link(pkg_filename):
         Topic :: System :: Systems Administration
         Topic :: Utilities
         """).strip().splitlines(),
-    python_requires='>=2.6,!=3.0.*,!=3.1.*,!=3.2.*',
+    python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*',
     extras_require={
         "ssl:sys_platform=='win32'": "wincertstore==0.2",
         "certs": "certifi==2016.9.26",

setuptools/archive_util.py

@@ -8,7 +8,7 @@
 import contextlib
 from distutils.errors import DistutilsError
 
-from pkg_resources import ensure_directory, ContextualZipFile
+from pkg_resources import ensure_directory
 
 __all__ = [
     "unpack_archive", "unpack_zipfile", "unpack_tarfile", "default_filter",
@@ -98,7 +98,7 @@ def unpack_zipfile(filename, extract_dir, progress_filter=default_filter):
     if not zipfile.is_zipfile(filename):
         raise UnrecognizedFormat("%s is not a zip file" % (filename,))
 
-    with ContextualZipFile(filename) as z:
+    with zipfile.ZipFile(filename) as z:
         for info in z.infolist():
             name = info.filename
 

setuptools/command/egg_info.py

@@ -158,9 +158,7 @@ def save_version_info(self, filename):
         build tag. Install these keys in a deterministic order
         to avoid arbitrary reordering on subsequent builds.
         """
-        # python 2.6 compatibility
-        odict = getattr(collections, 'OrderedDict', dict)
-        egg_info = odict()
+        egg_info = collections.OrderedDict()
         # follow the order these keys would have been added
         # when PYTHONHASHSEED=0
         egg_info['tag_build'] = self.tags()

setuptools/command/sdist.py

@@ -50,13 +50,6 @@ def run(self):
         for cmd_name in self.get_sub_commands():
             self.run_command(cmd_name)
 
-        # Call check_metadata only if no 'check' command
-        # (distutils <= 2.6)
-        import distutils.command
-
-        if 'check' not in distutils.command.__all__:
-            self.check_metadata()
-
         self.make_distribution()
 
         dist_files = getattr(self.distribution, 'dist_files', [])

setuptools/command/test.py

@@ -3,6 +3,7 @@
 import sys
 import contextlib
 import itertools
+import unittest
 from distutils.errors import DistutilsOptionError
 from unittest import TestLoader
 
@@ -13,7 +14,6 @@
                            working_set, _namespace_packages,
                            add_activation_listener, require, EntryPoint)
 from setuptools import Command
-from setuptools.py31compat import unittest_main
 
 
 class ScanningLoader(TestLoader):
@@ -225,12 +225,11 @@ def run_tests(self):
                         del_modules.append(name)
                 list(map(sys.modules.__delitem__, del_modules))
 
-        exit_kwarg = {} if sys.version_info < (2, 7) else {"exit": False}
-        unittest_main(
+        unittest.main(
             None, None, self._argv,
             testLoader=self._resolve_as_ep(self.test_loader),
             testRunner=self._resolve_as_ep(self.test_runner),
-            **exit_kwarg
+            exit=False,
         )
 
     @property

setuptools/config.py

@@ -4,9 +4,9 @@
 import sys
 from collections import defaultdict
 from functools import partial
+from importlib import import_module
 
 from distutils.errors import DistutilsOptionError, DistutilsFileError
-from setuptools.py26compat import import_module
 from setuptools.extern.six import string_types
 
 

setuptools/monkey.py

@@ -7,8 +7,8 @@
 import platform
 import types
 import functools
+from importlib import import_module
 
-from .py26compat import import_module
 from setuptools.extern import six
 
 import setuptools

setuptools/package_index.py

@@ -27,7 +27,6 @@
 from distutils import log
 from distutils.errors import DistutilsError
 from fnmatch import translate
-from setuptools.py26compat import strip_fragment
 from setuptools.py27compat import get_all_headers
 
 EGG_FRAGMENT = re.compile(r'^egg=([-A-Za-z0-9_.]+)$')
@@ -707,7 +706,7 @@ def _download_to(self, url, filename):
         fp, info = None, None
         try:
             checker = HashChecker.from_url(url)
-            fp = self.open_url(strip_fragment(url))
+            fp = self.open_url(url)
             if isinstance(fp, urllib.error.HTTPError):
                 raise DistutilsError(
                     "Can't download %s: %s %s" % (url, fp.code, fp.msg)