[chores] Removed code for Python<=3.9

Author: nemesifier

openwisp_utils/admin_theme/system_info.py

@@ -1,5 +1,5 @@
+import importlib.metadata
 import platform
-import sys
 from collections import OrderedDict
 
 import distro
@@ -9,33 +9,14 @@
 EXTRA_OPENWISP_PACKAGES = ["netdiff", "netjsonconfig"]
 
 
-# python 3.10+
-if sys.version_info >= (3, 10):
-    import importlib
-
-    def get_installed_openwisp_packages():
-        dists = importlib.metadata.distributions()
-        return {
-            dist.name: dist.version
-            for dist in dists
-            if dist.name is not None
-            and (
-                dist.name.startswith("openwisp") or dist.name in EXTRA_OPENWISP_PACKAGES
-            )
-        }
-
-
-# legacy python 3.9, deprecated on recent python versions
-else:
-    import pkg_resources
-
-    def get_installed_openwisp_packages():
-        dists = pkg_resources.working_set
-        return {
-            dist.key: dist.version
-            for dist in dists
-            if dist.key.startswith("openwisp") or dist.key in EXTRA_OPENWISP_PACKAGES
-        }
+def get_installed_openwisp_packages():
+    dists = importlib.metadata.distributions()
+    return {
+        dist.name: dist.version
+        for dist in dists
+        if dist.name is not None
+        and (dist.name.startswith("openwisp") or dist.name in EXTRA_OPENWISP_PACKAGES)
+    }
 
 
 def _get_openwisp2_detail(attribute_name, fallback=None):