Remove support for end-of-life Pythons

Python 2.7 and 3.4 are end-of-life. They are no longer receiving bug
fixes, including for security issues. Python 2.7 went EOL on 2020-01-01
and 3.4 on 2019-03-18. For additional details on support Python
versions, see:

Supported: https://devguide.python.org/#status-of-python-branches
EOL: https://devguide.python.org/devcycle/#end-of-life-branches

Removing support for EOL Pythons will reduce testing and maintenance
resources while allowing the library to move towards modern Python 3.

Using pypinfo, we can show the PyPI download statistics, showing less
than 10% of users are using Python 2.7.

| python_version | percent | download_count |
| -------------- | ------: | -------------: |
| 3.7            |  45.36% |      3,056,010 |
| 3.6            |  26.46% |      1,782,778 |
| 3.8            |  12.22% |        823,213 |
| 2.7            |   9.97% |        671,459 |
| 3.5            |   5.86% |        394,846 |
| 3.4            |   0.10% |          6,700 |
| 3.9            |   0.03% |          2,346 |
| 2.6            |   0.00% |             57 |
| 3.3            |   0.00% |             21 |
| 3.10           |   0.00% |              6 |
| Total          |         |      6,737,436 |

Library users who continue to use Python 2.7 will still be able to
install previous versions of sqlparse.

Compatibility shims have been dropped, simplifying the code.

Using pyupgrade, the codebase has been updated to take advantage of
modern syntax <https://github.com/asottile/pyupgrade>.

The wheel is no longer marked as "universal" as it is now Python 3 only.

1 files changed, 0 insertions, 45 deletions

diff --git a/sqlparse/compat.py b/sqlparse/compat.py
deleted file mode 100644
index d2214be..0000000
--- a/sqlparse/compat.py
+++ /dev/null
@@ -1,45 +0,0 @@
-# -*- coding: utf-8 -*-
-#
-# Copyright (C) 2009-2018 the sqlparse authors and contributors
-# <see AUTHORS file>
-#
-# This module is part of python-sqlparse and is released under
-# the BSD License: https://opensource.org/licenses/BSD-3-Clause
-
-"""Python 2/3 compatibility.
-
-This module only exists to avoid a dependency on six
-for very trivial stuff. We only need to take care of
-string types, buffers and metaclasses.
-
-Parts of the code is copied directly from six:
-https://bitbucket.org/gutworth/six
-"""
-
-import sys
-from io import TextIOBase
-
-PY2 = sys.version_info[0] == 2
-PY3 = sys.version_info[0] == 3
-
-
-if PY3:
-    def unicode_compatible(cls):
-        return cls
-
-    text_type = str
-    string_types = (str,)
-    from io import StringIO
-    file_types = (StringIO, TextIOBase)
-
-
-elif PY2:
-    def unicode_compatible(cls):
-        cls.__unicode__ = cls.__str__
-        cls.__str__ = lambda x: x.__unicode__().encode('utf-8')
-        return cls
-
-    text_type = unicode
-    string_types = (str, unicode,)
-    from StringIO import StringIO
-    file_types = (file, StringIO, TextIOBase)