Dropped support for unmaintained Python versions

18 files changed, 56 insertions, 136 deletions

diff --git a/.github/workflows/codeqa-test.yml b/.github/workflows/codeqa-test.yml
index feece77..cf75fa1 100644
--- a/.github/workflows/codeqa-test.yml
+++ b/.github/workflows/codeqa-test.yml
@@ -21,16 +21,20 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-10.15, macos-11, windows-latest]
-        python-version: ["2.7", "3.6", "3.9", "3.10", "pypy-2.7", "pypy-3.7"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.7"]
         exclude:
         - os: macos-11
-          python-version: pypy-2.7
+          python-version: "3.8"
+        - os: macos-11
+          python-version: "3.9"
+        - os: macos-11
+          python-version: "pypy-3.7"
         - os: windows-latest
-          python-version: "2.7"
+          python-version: "3.8"
         - os: windows-latest
-          python-version: pypy-2.7
+          python-version: "3.9"
         - os: windows-latest
-          python-version: pypy-3.7
+          python-version: "pypy-3.7"
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
@@ -38,8 +42,6 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Upgrade setuptools
-      run: pip install "setuptools >= 40.9"
     - name: Install the project
       run: "pip install --no-binary=:all: ."
     - name: Install test dependencies
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 50d896e..cade917 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -15,9 +15,7 @@ jobs:
       with:
         python-version: 3.8
     - name: Install dependencies
-      run: |
-        pip install "setuptools >= 40.9"
-        pip install .
+      run: pip install .
     - name: Create packages
       run: python setup.py sdist bdist_wheel
     - name: Upload packages
diff --git a/.readthedocs.yml b/.readthedocs.yml
index 582db99..0d6b0b4 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,7 +1,7 @@
 version: 2
 formats: [htmlzip, pdf]
 python:
-   version: 3.6
+   version: "3.7"
    install:
       - method: pip
         path: .
diff --git a/docs/news.rst b/docs/news.rst
index eddfcf6..9c6f6be 100644
--- a/docs/news.rst
+++ b/docs/news.rst
@@ -1,6 +1,10 @@
 Release Notes
 =============
 
+**UNRELEASED**
+
+- Dropped support for Python < 3.7
+
 **0.37.1 (2021-12-22)**
 
 - Fixed ``wheel pack`` duplicating the ``WHEEL`` contents when the build number has changed (#415)
diff --git a/setup.cfg b/setup.cfg
index 7f1a86f..9c82cc6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -9,18 +9,14 @@ classifiers =
     Topic :: System :: Archiving :: Packaging
     License :: OSI Approved :: MIT License
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
-    Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
-    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
 author = Daniel Holth
 author_email = dholth@fastmail.fm
-maintainer = Alex Gronholm
+maintainer = Alex Grönholm
 maintainer_email = alex.gronholm@nextday.fi
 url = https://github.com/pypa/wheel
 project_urls =
@@ -34,7 +30,7 @@ license = MIT
 package_dir=
     = src
 packages = find:
-python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
+python_requires = >=3.7
 setup_requires = setuptools >= 40.9.0
 zip_safe = False
 
@@ -65,7 +61,3 @@ show_missing = true
 
 [flake8]
 max-line-length = 99
-
-[bdist_wheel]
-# use py2.py3 tag for pure-python dist:
-universal = 1
diff --git a/setup.py b/setup.py
index 628efe3..6068493 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 from setuptools import setup
 
-setup(maintainer=u'Alex Grönholm')
+setup()
diff --git a/src/wheel/bdist_wheel.py b/src/wheel/bdist_wheel.py
index 80e43d0..84a3fcf 100644
--- a/src/wheel/bdist_wheel.py
+++ b/src/wheel/bdist_wheel.py
@@ -14,6 +14,7 @@ import warnings
 from collections import OrderedDict
 from distutils.core import Command
 from distutils import log as logger
+from email.generator import BytesGenerator
 from io import BytesIO
 from glob import iglob
 from shutil import rmtree
@@ -29,10 +30,6 @@ from .vendored.packaging import tags
 from .wheelfile import WheelFile
 from . import __version__ as wheel_version
 
-if sys.version_info < (3,):
-    from email.generator import Generator as BytesGenerator
-else:
-    from email.generator import BytesGenerator
 
 safe_name = pkg_resources.safe_name
 safe_version = pkg_resources.safe_version
@@ -69,8 +66,7 @@ def get_flag(var, fallback, expected=True, warn=True):
 
 
 def get_abi_tag():
-    """Return the ABI tag based on SOABI (if available) or emulate SOABI
-    (CPython 2, PyPy)."""
+    """Return the ABI tag based on SOABI (if available) or emulate SOABI (PyPy)."""
     soabi = get_config_var('SOABI')
     impl = tags.interpreter_name()
     if not soabi and impl in ('cp', 'pp') and hasattr(sys, 'maxunicode'):
@@ -81,19 +77,14 @@ def get_abi_tag():
                     hasattr(sys, 'gettotalrefcount'),
                     warn=(impl == 'cp')):
             d = 'd'
+
         if get_flag('WITH_PYMALLOC',
                     impl == 'cp',
                     warn=(impl == 'cp' and
                           sys.version_info < (3, 8))) \
                 and sys.version_info < (3, 8):
             m = 'm'
-        if get_flag('Py_UNICODE_SIZE',
-                    sys.maxunicode == 0x10ffff,
-                    expected=4,
-                    warn=(impl == 'cp' and
-                          sys.version_info < (3, 3))) \
-                and sys.version_info < (3, 3):
-            u = 'u'
+
         abi = '%s%s%s%s%s' % (impl, tags.interpreter_version(), d, m, u)
     elif soabi and soabi.startswith('cpython-'):
         abi = 'cp' + soabi.split('-')[1]
@@ -105,6 +96,7 @@ def get_abi_tag():
         abi = soabi.replace('.', '_').replace('-', '_')
     else:
         abi = None
+
     return abi
 
 
@@ -374,10 +366,6 @@ class bdist_wheel(Command):
     def write_wheelfile(self, wheelfile_base, generator='bdist_wheel (' + wheel_version + ')'):
         from email.message import Message
 
-        # Workaround for Python 2.7 for when "generator" is unicode
-        if sys.version_info < (3,) and not isinstance(generator, str):
-            generator = generator.encode('utf-8')
-
         msg = Message()
         msg['Wheel-Version'] = '1.0'  # of the spec
         msg['Generator'] = generator
diff --git a/src/wheel/cli/__init__.py b/src/wheel/cli/__init__.py
index 95740bf..d41dcfd 100644
--- a/src/wheel/cli/__init__.py
+++ b/src/wheel/cli/__init__.py
@@ -2,8 +2,6 @@
 Wheel command-line utility.
 """
 
-from __future__ import print_function
-
 import argparse
 import os
 import sys
diff --git a/src/wheel/cli/convert.py b/src/wheel/cli/convert.py
index 154f1b1..b502daf 100755
--- a/src/wheel/cli/convert.py
+++ b/src/wheel/cli/convert.py
@@ -1,7 +1,6 @@
 import os.path
 import re
 import shutil
-import sys
 import tempfile
 import zipfile
 from distutils import dist
@@ -261,8 +260,7 @@ def convert(files, dest_dir, verbose):
                 conv = wininst2wheel
 
             if verbose:
-                print("{}... ".format(installer))
-                sys.stdout.flush()
+                print("{}... ".format(installer), flush=True)
 
             conv(installer, dest_dir)
             if verbose:
diff --git a/src/wheel/cli/pack.py b/src/wheel/cli/pack.py
index 9403c51..04d858d 100644
--- a/src/wheel/cli/pack.py
+++ b/src/wheel/cli/pack.py
@@ -1,8 +1,5 @@
-from __future__ import print_function
-
 import os.path
 import re
-import sys
 
 from wheel.cli import WheelError
 from wheel.wheelfile import WheelFile
@@ -75,8 +72,7 @@ def pack(directory, dest_dir, build_number):
     # Repack the wheel
     wheel_path = os.path.join(dest_dir, '{}-{}.whl'.format(name_version, tagline))
     with WheelFile(wheel_path, 'w') as wf:
-        print("Repacking wheel as {}...".format(wheel_path), end='')
-        sys.stdout.flush()
+        print("Repacking wheel as {}...".format(wheel_path), end='', flush=True)
         wf.write_files(directory)
 
     print('OK')
diff --git a/src/wheel/cli/unpack.py b/src/wheel/cli/unpack.py
index 2e9857a..8aa8180 100644
--- a/src/wheel/cli/unpack.py
+++ b/src/wheel/cli/unpack.py
@@ -1,7 +1,4 @@
-from __future__ import print_function
-
 import os.path
-import sys
 
 from ..wheelfile import WheelFile
 
@@ -18,8 +15,7 @@ def unpack(path, dest='.'):
     with WheelFile(path) as wf:
         namever = wf.parsed_filename.group('namever')
         destination = os.path.join(dest, namever)
-        print("Unpacking to: {}...".format(destination), end='')
-        sys.stdout.flush()
+        print("Unpacking to: {}...".format(destination), end='', flush=True)
         wf.extractall(destination)
 
     print('OK')
diff --git a/src/wheel/pkginfo.py b/src/wheel/pkginfo.py
index 115be45..0470a1d 100644
--- a/src/wheel/pkginfo.py
+++ b/src/wheel/pkginfo.py
@@ -1,43 +1,23 @@
 """Tools for reading and writing PKG-INFO / METADATA without caring
 about the encoding."""
 
+from email.generator import BytesGenerator
 from email.parser import Parser
 
-try:
-    unicode
-    _PY3 = False
-except NameError:
-    _PY3 = True
-
-if not _PY3:
-    from email.generator import Generator
-
-    def read_pkg_info_bytes(bytestr):
-        return Parser().parsestr(bytestr)
-
-    def read_pkg_info(path):
-        with open(path, "r") as headers:
-            message = Parser().parse(headers)
-        return message
-
-    def write_pkg_info(path, message):
-        with open(path, 'w') as metadata:
-            Generator(metadata, mangle_from_=False, maxheaderlen=0).flatten(message)
-else:
-    from email.generator import BytesGenerator
-
-    def read_pkg_info_bytes(bytestr):
-        headers = bytestr.decode(encoding="ascii", errors="surrogateescape")
-        message = Parser().parsestr(headers)
-        return message
-
-    def read_pkg_info(path):
-        with open(path, "r",
-                  encoding="ascii",
-                  errors="surrogateescape") as headers:
-            message = Parser().parse(headers)
-        return message
-
-    def write_pkg_info(path, message):
-        with open(path, "wb") as out:
-            BytesGenerator(out, mangle_from_=False, maxheaderlen=0).flatten(message)
+
+def read_pkg_info_bytes(bytestr):
+    headers = bytestr.decode(encoding="ascii", errors="surrogateescape")
+    message = Parser().parsestr(headers)
+    return message
+
+
+def read_pkg_info(path):
+    with open(path, "r", encoding="ascii", errors="surrogateescape") as headers:
+        message = Parser().parse(headers)
+
+    return message
+
+
+def write_pkg_info(path, message):
+    with open(path, "wb") as out:
+        BytesGenerator(out, mangle_from_=False, maxheaderlen=0).flatten(message)
diff --git a/src/wheel/util.py b/src/wheel/util.py
index 3ae2b44..a1f1e3b 100644
--- a/src/wheel/util.py
+++ b/src/wheel/util.py
@@ -1,25 +1,10 @@
 import base64
-import io
-import sys
 
 
-if sys.version_info[0] < 3:
-    text_type = unicode  # noqa: F821
-
-    StringIO = io.BytesIO
-
-    def native(s, encoding='utf-8'):
-        if isinstance(s, unicode):  # noqa: F821
-            return s.encode(encoding)
-        return s
-else:
-    text_type = str
-
-    StringIO = io.StringIO
-
-    def native(s, encoding='utf-8'):
-        if isinstance(s, bytes):
-            return s.decode(encoding)
+def native(s, encoding='utf-8'):
+    if isinstance(s, bytes):
+        return s.decode(encoding)
+    else:
         return s
 
 
@@ -41,6 +26,7 @@ def as_unicode(s):
 
 
 def as_bytes(s):
-    if isinstance(s, text_type):
+    if isinstance(s, str):
         return s.encode('utf-8')
-    return s
+    else:
+        return s
diff --git a/src/wheel/wheelfile.py b/src/wheel/wheelfile.py
index 21e7361..2295306 100644
--- a/src/wheel/wheelfile.py
+++ b/src/wheel/wheelfile.py
@@ -1,28 +1,16 @@
-from __future__ import print_function
-
 import csv
 import hashlib
 import os.path
 import re
 import stat
-import sys
 import time
 from collections import OrderedDict
 from distutils import log as logger
+from io import StringIO, TextIOWrapper
 from zipfile import ZIP_DEFLATED, ZipInfo, ZipFile
 
 from wheel.cli import WheelError
-from wheel.util import urlsafe_b64decode, as_unicode, native, urlsafe_b64encode, as_bytes, StringIO
-
-if sys.version_info >= (3,):
-    from io import TextIOWrapper
-
-    def read_csv(fp):
-        return csv.reader(TextIOWrapper(fp, newline='', encoding='utf-8'))
-else:
-    def read_csv(fp):
-        for line in csv.reader(fp):
-            yield [column.decode('utf-8') for column in line]
+from wheel.util import urlsafe_b64decode, as_unicode, native, urlsafe_b64encode, as_bytes
 
 # Non-greedy matching of an optional build number may be too clever (more
 # invalid wheel filenames will match). Separate regex for .dist-info?
@@ -71,7 +59,7 @@ class WheelFile(ZipFile):
                 raise WheelError('Missing {} file'.format(self.record_path))
 
             with record:
-                for line in read_csv(record):
+                for line in csv.reader(TextIOWrapper(record, newline='', encoding='utf-8')):
                     path, hash_sum, size = line
                     if not hash_sum:
                         continue
diff --git a/tests/test_bdist_wheel.py b/tests/test_bdist_wheel.py
index 651c034..a0de591 100644
--- a/tests/test_bdist_wheel.py
+++ b/tests/test_bdist_wheel.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 import os.path
 import shutil
 import stat
diff --git a/tests/test_wheelfile.py b/tests/test_wheelfile.py
index db11bcd..0e060b1 100644
--- a/tests/test_wheelfile.py
+++ b/tests/test_wheelfile.py
@@ -1,6 +1,3 @@
-# coding: utf-8
-from __future__ import unicode_literals
-
 import sys
 from zipfile import ZipFile, ZIP_DEFLATED
 
diff --git a/tests/testdata/unicode.dist/setup.py b/tests/testdata/unicode.dist/setup.py
index bb0ff60..3382b53 100644
--- a/tests/testdata/unicode.dist/setup.py
+++ b/tests/testdata/unicode.dist/setup.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 from setuptools import setup
 
 setup(name='unicode.dist',
diff --git a/tox.ini b/tox.ini
index 54c73dd..21166a9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, py35, py36, py37, py38, py39, py310, pypy, pypy3, flake8
+envlist = py37, py38, py39, py310, pypy3.7, flake8
 minversion = 3.3.0
 skip_missing_interpreters = true