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, 2 insertions, 4 deletions

diff --git a/tests/conftest.py b/tests/conftest.py
index f2473a4..939c481 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 """Helpers for testing."""
 
 import io
@@ -35,7 +33,7 @@ def load_file(filepath):
         # https://stackoverflow.com/questions/18011902/py-test-pass-a-parameter-to-a-fixture-function/33879151#33879151
         # Syntax is noisy and requires specific variable names
         # And seems to be limited to only 1 argument.
-        with io.open(filepath(filename), encoding=encoding) as f:
+        with open(filepath(filename), encoding=encoding) as f:
             return f.read().strip()
 
     return make_load_file
@@ -44,6 +42,6 @@ def load_file(filepath):
 @pytest.fixture()
 def get_stream(filepath):
     def make_stream(filename, encoding='utf-8'):
-        return io.open(filepath(filename), encoding=encoding)
+        return open(filepath(filename), encoding=encoding)
 
     return make_stream