Drop support for Python 2.7 (#865)

* Python syntax upgraded using `pyupgrade --py3-plus` * Travis no longer uses `sudo`. See https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration See #760 for Python Version Support Timeline and related dicussion.
Python-Markdown · Oct 24, 2019 · dab931f · dab931f
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diff --git a/.travis.yml b/.travis.yml
@@ -1,24 +1,16 @@
-dist: xenial
-sudo: false
 language: python
 cache: pip
 
 matrix:
   include:
-    - python: '2.7'
-      env: TOXENV=py27
     - python: '3.5'
       env: TOXENV=py35
     - python: '3.6'
       env: TOXENV=py36
     - python: '3.7'
       env: TOXENV=py37
-    - python: 'pypy'
-      env: TOXENV=pypy
-      dist: trusty
     - python: 'pypy3'
       env: TOXENV=pypy3
-      dist: trusty
     - env: TOXENV=flake8
     - env: TOXENV=checkspelling
       addons:
@@ -34,8 +26,7 @@ addons:
     - libtidy-0.99-0
 
 install:
-  # NOTE: setuptools needs to be installed explicitly for py34 (trusty).
-  - pip install 'setuptools>=36' tox
+  - pip install tox
 
 script:
   - tox

diff --git a/docs/change_log/release-3.2.md b/docs/change_log/release-3.2.md
@@ -2,11 +2,16 @@ title: Release Notes for v3.2
 
 # Python-Markdown 3.2 Release Notes
 
-Python-Markdown version 3.2 supports Python versions 2.7, 3.5, 3.6, 3.7,
+Python-Markdown version 3.2 supports Python versions 3.5, 3.6, 3.7,
 PyPy and PyPy3.
 
 ## Backwards-incompatible changes
 
+### Drop support for Python 2.7
+
+Python 2.7 reaches end-of-life on 2020-01-01 and Python-Markdown 3.2 has dropped
+support for it. Please upgrade to Python 3, or use Python-Markdown 3.1.
+
 ### `em` and `strong` inline processor changes
 
 In order to fix issue #792, `em`/`strong` inline processors were refactored. This

diff --git a/docs/index.md b/docs/index.md
@@ -18,11 +18,11 @@ Goals
 
 The Python-Markdown project is developed with the following goals in mind:
 
-* Maintain a Python 2 *and* Python 3 library (with an optional CLI wrapper)
-  suited to use in web server environments (never raise an exception, never
-  write to stdout, etc.) as an implementation of the markdown parser that
-  follows the [syntax rules](https://daringfireball.net/projects/markdown/syntax)
-  and the behavior of the original (markdown.pl) implementation as reasonably as
+* Maintain a Python library (with an optional CLI wrapper) suited to use in web
+  server environments (never raise an exception, never write to stdout, etc.) as
+  an implementation of the markdown parser that follows the
+  [syntax rules](https://daringfireball.net/projects/markdown/syntax) and the
+  behavior of the original (markdown.pl) implementation as reasonably as
   possible (see [differences](#differences) for a few exceptions).
 
 * Provide an [Extension API](extensions/api.md) which makes it possible

diff --git a/markdown/__init__.py b/markdown/__init__.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Python Markdown
 
@@ -20,8 +19,6 @@
 License: BSD (see LICENSE.md for details).
 """
 
-from __future__ import absolute_import
-from __future__ import unicode_literals
 from .core import Markdown, markdown, markdownFromFile
 from .util import PY37
 from .pep562 import Pep562

diff --git a/markdown/__main__.py b/markdown/__main__.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Python Markdown
 
@@ -148,5 +147,5 @@ def run():  # pragma: no cover
 
 if __name__ == '__main__':  # pragma: no cover
     # Support running module as a commandline command.
-    # Python 2.7 & 3.x do: `python -m markdown [options] [args]`.
+    # `python -m markdown [options] [args]`.
     run()
diff --git a/markdown/__meta__.py b/markdown/__meta__.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Python Markdown
 

diff --git a/markdown/blockparser.py b/markdown/blockparser.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Python Markdown
 
@@ -20,8 +19,6 @@
 License: BSD (see LICENSE.md for details).
 """
 
-from __future__ import unicode_literals
-from __future__ import absolute_import
 from . import util
 
 

diff --git a/markdown/blockprocessors.py b/markdown/blockprocessors.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Python Markdown
 
@@ -31,9 +30,6 @@
 as they need to alter how markdown blocks are parsed.
 """
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import unicode_literals
 import logging
 import re
 from . import util
@@ -58,7 +54,7 @@ def build_block_parser(md, **kwargs):
     return parser
 
 
-class BlockProcessor(object):
+class BlockProcessor:
     """ Base class for block processors.
 
     Each subclass will provide the methods below to work with the source and
@@ -161,7 +157,7 @@ class ListIndentProcessor(BlockProcessor):
     LIST_TYPES = ['ul', 'ol']
 
     def __init__(self, *args):
-        super(ListIndentProcessor, self).__init__(*args)
+        super().__init__(*args)
         self.INDENT_RE = re.compile(r'^(([ ]{%s})+)' % self.tab_length)
 
     def test(self, parent, block):
@@ -259,7 +255,7 @@ def run(self, parent, blocks):
             code = sibling[0]
             block, theRest = self.detab(block)
             code.text = util.AtomicString(
-                '%s\n%s\n' % (code.text, util.code_escape(block.rstrip()))
+                '{}\n{}\n'.format(code.text, util.code_escape(block.rstrip()))
             )
         else:
             # This is a new codeblock. Create the elements and insert text.
@@ -331,7 +327,7 @@ class OListProcessor(BlockProcessor):
     SIBLING_TAGS = ['ol', 'ul']
 
     def __init__(self, parser):
-        super(OListProcessor, self).__init__(parser)
+        super().__init__(parser)
         # Detect an item (``1. item``). ``group(1)`` contains contents of item.
         self.RE = re.compile(r'^[ ]{0,%d}\d+\.[ ]+(.*)' % (self.tab_length - 1))
         # Detect items on secondary lines. they can be of either list type.
@@ -421,12 +417,12 @@ def get_items(self, block):
                 # This is an indented (possibly nested) item.
                 if items[-1].startswith(' '*self.tab_length):
                     # Previous item was indented. Append to that item.
-                    items[-1] = '%s\n%s' % (items[-1], line)
+                    items[-1] = '{}\n{}'.format(items[-1], line)
                 else:
                     items.append(line)
             else:
                 # This is another line of previous item. Append to that item.
-                items[-1] = '%s\n%s' % (items[-1], line)
+                items[-1] = '{}\n{}'.format(items[-1], line)
         return items
 
 
@@ -436,7 +432,7 @@ class UListProcessor(OListProcessor):
     TAG = 'ul'
 
     def __init__(self, parser):
-        super(UListProcessor, self).__init__(parser)
+        super().__init__(parser)
         # Detect an item (``1. item``). ``group(1)`` contains contents of item.
         self.RE = re.compile(r'^[ ]{0,%d}[*+-][ ]+(.*)' % (self.tab_length - 1))
 
@@ -553,7 +549,7 @@ def run(self, parent, blocks):
            len(sibling) and sibling[0].tag == 'code'):
             # Last block is a codeblock. Append to preserve whitespace.
             sibling[0].text = util.AtomicString(
-                '%s%s' % (sibling[0].text, filler)
+                '{}{}'.format(sibling[0].text, filler)
             )
 
 
@@ -580,13 +576,13 @@ def run(self, parent, blocks):
                 if sibling is not None:
                     # Insetrt after sibling.
                     if sibling.tail:
-                        sibling.tail = '%s\n%s' % (sibling.tail, block)
+                        sibling.tail = '{}\n{}'.format(sibling.tail, block)
                     else:
                         sibling.tail = '\n%s' % block
                 else:
                     # Append to parent.text
                     if parent.text:
-                        parent.text = '%s\n%s' % (parent.text, block)
+                        parent.text = '{}\n{}'.format(parent.text, block)
                     else:
                         parent.text = block.lstrip()
             else:

diff --git a/markdown/core.py b/markdown/core.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Python Markdown
 
@@ -20,8 +19,6 @@
 License: BSD (see LICENSE.md for details).
 """
 
-from __future__ import absolute_import
-from __future__ import unicode_literals
 import codecs
 import sys
 import logging
@@ -42,7 +39,7 @@
 logger = logging.getLogger('MARKDOWN')
 
 
-class Markdown(object):
+class Markdown:
     """Convert Markdown to HTML."""
 
     doc_tag = "div"     # Element used to wrap document - later removed
@@ -122,7 +119,7 @@ def registerExtensions(self, extensions, configs):
 
         """
         for ext in extensions:
-            if isinstance(ext, util.string_type):
+            if isinstance(ext, str):
                 ext = self.build_extension(ext, configs.get(ext, {}))
             if isinstance(ext, Extension):
                 ext._extendMarkdown(self)
@@ -132,7 +129,7 @@ def registerExtensions(self, extensions, configs):
                 )
             elif ext is not None:
                 raise TypeError(
-                    'Extension "%s.%s" must be of type: "%s.%s"' % (
+                    'Extension "{}.{}" must be of type: "{}.{}"'.format(
                         ext.__class__.__module__, ext.__class__.__name__,
                         Extension.__module__, Extension.__name__
                     )
@@ -221,7 +218,7 @@ def set_output_format(self, format):
 
     def is_block_level(self, tag):
         """Check if the tag is a block level HTML tag."""
-        if isinstance(tag, util.string_type):
+        if isinstance(tag, str):
             return tag.lower().rstrip('/') in self.block_level_elements
         # Some ElementTree tags are not strings, so return False.
         return False
@@ -253,7 +250,7 @@ def convert(self, source):
             return ''  # a blank unicode string
 
         try:
-            source = util.text_type(source)
+            source = str(source)
         except UnicodeDecodeError as e:  # pragma: no cover
             # Customise error message while maintaining original trackback
             e.reason += '. -- Note: Markdown only accepts unicode input!'
@@ -321,15 +318,15 @@ def convertFile(self, input=None, output=None, encoding=None):
 
         # Read the source
         if input:
-            if isinstance(input, util.string_type):
+            if isinstance(input, str):
                 input_file = codecs.open(input, mode="r", encoding=encoding)
             else:
                 input_file = codecs.getreader(encoding)(input)
             text = input_file.read()
             input_file.close()
         else:
             text = sys.stdin.read()
-            if not isinstance(text, util.text_type):  # pragma: no cover
+            if not isinstance(text, str):  # pragma: no cover
                 text = text.decode(encoding)
 
         text = text.lstrip('\ufeff')  # remove the byte-order mark
@@ -339,7 +336,7 @@ def convertFile(self, input=None, output=None, encoding=None):
 
         # Write to file or stdout
         if output:
-            if isinstance(output, util.string_type):
+            if isinstance(output, str):
                 output_file = codecs.open(output, "w",
                                           encoding=encoding,
                                           errors="xmlcharrefreplace")

diff --git a/markdown/extensions/__init__.py b/markdown/extensions/__init__.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Python Markdown
 
@@ -20,12 +19,11 @@
 License: BSD (see LICENSE.md for details).
 """
 
-from __future__ import unicode_literals
 import warnings
 from ..util import parseBoolValue
 
 
-class Extension(object):
+class Extension:
     """ Base class for extensions to subclass. """
 
     # Default config -- to be overriden by a subclass
@@ -50,7 +48,7 @@ def getConfig(self, key, default=''):
 
     def getConfigs(self):
         """ Return all configs settings as a dict. """
-        return dict([(key, self.getConfig(key)) for key in self.config.keys()])
+        return {key: self.getConfig(key) for key in self.config.keys()}
 
     def getConfigInfo(self):
         """ Return all config descriptions as a list of tuples. """
@@ -81,7 +79,7 @@ def _extendMarkdown(self, *args):
             # Must be a 2.x extension. Pass in a dumby md_globals.
             self.extendMarkdown(md, {})
             warnings.warn(
-                "The 'md_globals' parameter of '{0}.{1}.extendMarkdown' is "
+                "The 'md_globals' parameter of '{}.{}.extendMarkdown' is "
                 "deprecated.".format(self.__class__.__module__, self.__class__.__name__),
                 category=DeprecationWarning,
                 stacklevel=2

diff --git a/markdown/extensions/abbr.py b/markdown/extensions/abbr.py
@@ -16,8 +16,6 @@
 
 '''
 
-from __future__ import absolute_import
-from __future__ import unicode_literals
 from . import Extension
 from ..preprocessors import Preprocessor
 from ..inlinepatterns import InlineProcessor
@@ -81,7 +79,7 @@ class AbbrInlineProcessor(InlineProcessor):
     """ Abbreviation inline pattern. """
 
     def __init__(self, pattern, title):
-        super(AbbrInlineProcessor, self).__init__(pattern)
+        super().__init__(pattern)
         self.title = title
 
     def handleMatch(self, m, data):

diff --git a/markdown/extensions/admonition.py b/markdown/extensions/admonition.py
@@ -17,8 +17,6 @@
 
 """
 
-from __future__ import absolute_import
-from __future__ import unicode_literals
 from . import Extension
 from ..blockprocessors import BlockProcessor
 from ..util import etree
@@ -61,7 +59,7 @@ def run(self, parent, blocks):
         if m:
             klass, title = self.get_class_and_title(m)
             div = etree.SubElement(parent, 'div')
-            div.set('class', '%s %s' % (self.CLASSNAME, klass))
+            div.set('class', '{} {}'.format(self.CLASSNAME, klass))
             if title:
                 p = etree.SubElement(div, 'p')
                 p.text = title

diff --git a/markdown/extensions/attr_list.py b/markdown/extensions/attr_list.py
@@ -17,8 +17,6 @@
 
 """
 
-from __future__ import absolute_import
-from __future__ import unicode_literals
 from . import Extension
 from ..treeprocessors import Treeprocessor
 import re
@@ -145,7 +143,7 @@ def assign_attrs(self, elem, attrs):
                 # add to class
                 cls = elem.get('class')
                 if cls:
-                    elem.set('class', '%s %s' % (cls, v))
+                    elem.set('class', '{} {}'.format(cls, v))
                 else:
                     elem.set('class', v)
             else: