fix deprecation warning for __version__ (#543)

tests/test_config.py

@@ -1,17 +1,31 @@
 import json
+import sys
 from datetime import date
 from datetime import timedelta
 
 import pytest
 from dateutil.relativedelta import relativedelta
-from flask import __version__ as flask_version
 from flask import Flask
 
 from flask_jwt_extended import JWTManager
 from flask_jwt_extended.config import config
 from flask_jwt_extended.internal_utils import JSONEncoder
 
 
+def get_package_version(package_name):
+    if sys.version_info >= (3, 8):
+        # Use importlib.metadata for Python 3.8 and newer
+        import importlib.metadata
+
+        return importlib.metadata.version(package_name)
+    else:
+        # Use pkg_resources for older versions
+        import pkg_resources
+
+        return pkg_resources.get_distribution(package_name).version
+
+
+flask_version = get_package_version("flask")
 flask_version_tuple = tuple(map(int, flask_version.split(".")))
 
 

tox.ini

@@ -27,6 +27,7 @@ deps =
   python-dateutil
   types-python-dateutil
   mypy
+  types-setuptools
 
 [testenv:coverage]
 commands =