Single sourcing the package version (#1791)

Author: chayim

redis/__init__.py

@@ -1,3 +1,10 @@
+import sys
+
+if sys.version_info >= (3, 8):
+    from importlib import metadata
+else:
+    import importlib_metadata as metadata
+
 from redis.client import Redis, StrictRedis
 from redis.cluster import RedisCluster
 from redis.connection import (
@@ -38,7 +45,10 @@ def int_or_str(value):
         return value
 
 
-__version__ = "4.1.0rc2"
+try:
+    __version__ = metadata.version("redis")
+except metadata.PackageNotFoundError:
+    __version__ = "99.99.99"
 
 
 VERSION = tuple(map(int_or_str, __version__.split(".")))

setup.py

@@ -1,16 +1,14 @@
 #!/usr/bin/env python
 from setuptools import find_packages, setup
 
-import redis
-
 setup(
     name="redis",
     description="Python client for Redis database and key-value store",
     long_description=open("README.md").read().strip(),
     long_description_content_type="text/markdown",
     keywords=["Redis", "key-value store", "database"],
     license="MIT",
-    version=redis.__version__,
+    version="4.1.0rc2",
     packages=find_packages(
         include=[
             "redis",
@@ -26,12 +24,10 @@
     author="Redis Inc.",
     author_email="[email protected]",
     python_requires=">=3.6",
-    setup_requires=[
-        "packaging>=21.3",
-    ],
     install_requires=[
         "deprecated>=1.2.3",
         "packaging>=21.3",
+        'importlib-metadata >= 1.0; python_version < "3.8"',
     ],
     classifiers=[
         "Development Status :: 5 - Production/Stable",