only support pythons that are not EOL (https://endoflife.date/python)

Even debian oldstable has python 3.9. For internet-facing libraries it
is not secure for contributor to install unsupported python versions in order to test them.
Reducing the number of python versions will make maintenance and testing easier.

.github/workflows/python-tox.yml

@@ -12,9 +12,6 @@ jobs:
         os: [ubuntu-latest, windows-latest]
         deps: [base, optional]
         include:
-          - python: "pypy-2.7"
-            os: ubuntu-latest
-            deps: base
           - python: "pypy-3.10"
             os: ubuntu-latest
             deps: base

README.rst

@@ -29,7 +29,7 @@ or:
 
 By default, the ``document`` will be an ``xml.etree`` element instance.
 Whenever possible, html5lib chooses the accelerated ``ElementTree``
-implementation (i.e. ``xml.etree.cElementTree`` on Python 2.x).
+implementation.
 
 Two other tree types are supported: ``xml.dom.minidom`` and
 ``lxml.etree``. To use an alternative format, specify the name of
@@ -41,18 +41,6 @@ a treebuilder:
   with open("mydocument.html", "rb") as f:
       lxml_etree_document = html5lib.parse(f, treebuilder="lxml")
 
-When using with ``urllib2`` (Python 2), the charset from HTTP should be
-pass into html5lib as follows:
-
-.. code-block:: python
-
-  from contextlib import closing
-  from urllib2 import urlopen
-  import html5lib
-
-  with closing(urlopen("http://example.com/")) as f:
-      document = html5lib.parse(f, transport_encoding=f.info().getparam("charset"))
-
 When using with ``urllib.request`` (Python 3), the charset from HTTP
 should be pass into html5lib as follows:
 
@@ -90,7 +78,7 @@ More documentation is available at https://html5lib.readthedocs.io/.
 Installation
 ------------
 
-html5lib works on CPython 2.7+, CPython 3.5+ and PyPy. To install:
+html5lib works on CPython 3.8+ and PyPy. To install:
 
 .. code-block:: bash
 

html5lib/_trie/_base.py

@@ -1,8 +1,5 @@
 
-try:
-    from collections.abc import Mapping
-except ImportError:  # Python 2.7
-    from collections.abc import Mapping
+from collections.abc import Mapping
 
 
 class Trie(Mapping):

html5lib/html5parser.py

@@ -427,7 +427,7 @@ def processSpaceCharacters(self, token):
     def processStartTag(self, token):
         # Note the caching is done here rather than BoundMethodDispatcher as doing it there
         # requires a circular reference to the Phase, and this ends up with a significant
-        # (CPython 2.7, 3.8) GC cost when parsing many short inputs
+        # (CPython 3.8) GC cost when parsing many short inputs
         name = token["name"]
         # In Py2, using `in` is quicker in general than try/except KeyError
         # In Py3, `in` is quicker when there are few cache hits (typically short inputs)
@@ -454,7 +454,7 @@ def startTagHtml(self, token):
     def processEndTag(self, token):
         # Note the caching is done here rather than BoundMethodDispatcher as doing it there
         # requires a circular reference to the Phase, and this ends up with a significant
-        # (CPython 2.7, 3.8) GC cost when parsing many short inputs
+        # (CPython 3.8) GC cost when parsing many short inputs
         name = token["name"]
         # In Py2, using `in` is quicker in general than try/except KeyError
         # In Py3, `in` is quicker when there are few cache hits (typically short inputs)

html5lib/treebuilders/dom.py

@@ -1,9 +1,6 @@
 
 
-try:
-    from collections.abc import MutableMapping
-except ImportError:  # Python 2.7
-    from collections.abc import MutableMapping
+from collections.abc import MutableMapping
 from xml.dom import minidom, Node
 import weakref
 

setup.py

@@ -63,11 +63,7 @@ def default_environment():
     'Operating System :: OS Independent',
     '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 :: 3.7',
     'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',
@@ -109,7 +105,7 @@ def default_environment():
           'six>=1.9',
           'webencodings>=0.5.1',
       ],
-      python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*",
+      python_requires=">=3.8",
       extras_require={
           # A conditional extra will only install these items when the extra is
           # requested and the condition matches.

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{27,35,36,37,38,39,310,311,py,py3}-{base,optional,oldest}
+envlist = py{38,39,310,311,py,py3}-{base,optional,oldest}
 
 [testenv]
 deps =

toxver.py

@@ -12,9 +12,6 @@
     $ toxver.py pypy-3.8 base
     TOXENV=pypy3-base
 
-    $ toxver.py 2.7 oldest
-    TOXENV=py27-oldest
-
     $ toxver.py ~3.12.0-0 optional
     TOXENV=py312-optional
 
@@ -31,10 +28,6 @@ def main(argv):
 
     deps = argv[2]
 
-    if argv[1].startswith("pypy-2"):
-        print("TOXENV=pypy-" + deps)
-        return 0
-
     if argv[1].startswith("pypy-3"):
         print("TOXENV=pypy3-" + deps)
         return 0