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, 5 deletions

diff --git a/redis/utils.py b/redis/utils.py
index 6ef6fd4..3664708 100644
--- a/redis/utils.py
+++ b/redis/utils.py
@@ -26,8 +26,13 @@ def pipeline(redis_obj):
     p.execute()
 
 
-class dummy(object):
-    """
-    Instances of this class can be used as an attribute container.
-    """
-    pass
+def str_if_bytes(value):
+    return (
+        value.decode('utf-8', errors='replace')
+        if isinstance(value, bytes)
+        else value
+    )
+
+
+def safe_str(value):
+    return str(str_if_bytes(value))