Remove support for end-of-life Python 2.7 (#1318)

Remove support for end-of-life Python 2.7

Python 2.7 is end of life. It is no longer receiving bug fixes,
including for security issues. Python 2.7 went EOL on 2020-01-01. 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 a modern Python 3
style. Python 2.7 users can continue to use the previous version of
redis-py.

Was able to simplify the code:

- Removed redis._compat module
- Removed __future__ imports
- Removed object from class definition (all classes are new style)
- Removed long (Python 3 unified numeric types)
- Removed deprecated __nonzero__ method
- Use simpler Python 3 super() syntax
- Use unified OSError exception
- Use yield from syntax

Co-authored-by: Andy McCurdy <andy@andymccurdy.com>

1 files changed, 10 insertions, 10 deletions

diff --git a/tests/test_connection_pool.py b/tests/test_connection_pool.py
index c49ecda..c26090b 100644
--- a/tests/test_connection_pool.py
+++ b/tests/test_connection_pool.py
@@ -1,9 +1,9 @@
 import os
-import mock
 import pytest
 import re
 import redis
 import time
+from unittest import mock
 
 from threading import Thread
 from redis.connection import ssl_available, to_bool
@@ -11,7 +11,7 @@ from .conftest import skip_if_server_version_lt, _get_client, REDIS_6_VERSION
 from .test_pubsub import wait_for_message
 
 
-class DummyConnection(object):
+class DummyConnection:
     description_format = "DummyConnection<>"
 
     def __init__(self, **kwargs):
@@ -25,7 +25,7 @@ class DummyConnection(object):
         return False
 
 
-class TestConnectionPool(object):
+class TestConnectionPool:
     def get_pool(self, connection_kwargs=None, max_connections=None,
                  connection_class=redis.Connection):
         connection_kwargs = connection_kwargs or {}
@@ -93,7 +93,7 @@ class TestConnectionPool(object):
         assert repr(pool) == expected
 
 
-class TestBlockingConnectionPool(object):
+class TestBlockingConnectionPool:
     def get_pool(self, connection_kwargs=None, max_connections=10, timeout=20):
         connection_kwargs = connection_kwargs or {}
         pool = redis.BlockingConnectionPool(connection_class=DummyConnection,
@@ -179,7 +179,7 @@ class TestBlockingConnectionPool(object):
         assert repr(pool) == expected
 
 
-class TestConnectionPoolURLParsing(object):
+class TestConnectionPoolURLParsing:
     def test_defaults(self):
         pool = redis.ConnectionPool.from_url('redis://localhost')
         assert pool.connection_class == redis.Connection
@@ -411,7 +411,7 @@ class TestConnectionPoolURLParsing(object):
         )
 
 
-class TestConnectionPoolUnixSocketURLParsing(object):
+class TestConnectionPoolUnixSocketURLParsing:
     def test_defaults(self):
         pool = redis.ConnectionPool.from_url('unix:///socket')
         assert pool.connection_class == redis.UnixDomainSocketConnection
@@ -519,7 +519,7 @@ class TestConnectionPoolUnixSocketURLParsing(object):
         }
 
 
-class TestSSLConnectionURLParsing(object):
+class TestSSLConnectionURLParsing:
     @pytest.mark.skipif(not ssl_available, reason="SSL not installed")
     def test_defaults(self):
         pool = redis.ConnectionPool.from_url('rediss://localhost')
@@ -561,7 +561,7 @@ class TestSSLConnectionURLParsing(object):
         assert pool.get_connection('_').check_hostname is True
 
 
-class TestConnection(object):
+class TestConnection:
     def test_on_connect_error(self):
         """
         An error in Connection.on_connect should disconnect from the server
@@ -658,7 +658,7 @@ class TestConnection(object):
             r.execute_command('DEBUG', 'ERROR', 'ERR invalid password')
 
 
-class TestMultiConnectionClient(object):
+class TestMultiConnectionClient:
     @pytest.fixture()
     def r(self, request):
         return _get_client(redis.Redis,
@@ -671,7 +671,7 @@ class TestMultiConnectionClient(object):
         assert r.get('a') == b'123'
 
 
-class TestHealthCheck(object):
+class TestHealthCheck:
     interval = 60
 
     @pytest.fixture()