From 2dc9e5b306457dcc6b3bca26cdb3169c91bd1a61 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 6 Mar 2026 01:21:34 +0000
Subject: [PATCH 1/2] Initial plan


From 232515d0cba584910b418e311ee87f74b1937366 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 6 Mar 2026 01:26:18 +0000
Subject: [PATCH 2/2] Add NULL_LABEL constant for Azure App Configuration
 Provider

Co-authored-by: mrm9084 <1054559+mrm9084@users.noreply.github.com>
---
 .../azure-appconfiguration-provider/CHANGELOG.md         | 2 ++
 .../azure-appconfiguration-provider/README.md            | 4 ++--
 .../azure/appconfiguration/provider/__init__.py          | 2 ++
 .../azure/appconfiguration/provider/_constants.py        | 8 ++++++++
 .../tests/test_setting_selector.py                       | 9 +++++++++
 5 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/sdk/appconfiguration/azure-appconfiguration-provider/CHANGELOG.md b/sdk/appconfiguration/azure-appconfiguration-provider/CHANGELOG.md
index 3175bb377923..b68b6e8ef884 100644
--- a/sdk/appconfiguration/azure-appconfiguration-provider/CHANGELOG.md
+++ b/sdk/appconfiguration/azure-appconfiguration-provider/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ### Features Added
 
+- Added `NULL_LABEL` constant for use with `SettingSelector` to represent configuration settings with no label assigned.
+
 ### Breaking Changes
 
 ### Bugs Fixed
diff --git a/sdk/appconfiguration/azure-appconfiguration-provider/README.md b/sdk/appconfiguration/azure-appconfiguration-provider/README.md
index beef0a637f17..25ff4aa9a84b 100644
--- a/sdk/appconfiguration/azure-appconfiguration-provider/README.md
+++ b/sdk/appconfiguration/azure-appconfiguration-provider/README.md
@@ -63,10 +63,10 @@ List of features we are going to add to the Python Provider in the future.
 You can refine or expand the configurations loaded from your store by using `SettingSelector`s. Setting selectors provide a way to pass a key filter and label filter into the provider.
 
 ```python
-from azure.appconfiguration.provider import load, SettingSelector
+from azure.appconfiguration.provider import load, SettingSelector, NULL_LABEL
 from azure.identity import DefaultAzureCredential
 
-selects = {SettingSelector(key_filter="*", label_filter="\0"), SettingSelector(key_filter="*", label_filter="dev")}
+selects = {SettingSelector(key_filter="*", label_filter=NULL_LABEL), SettingSelector(key_filter="*", label_filter="dev")}
 config = load(endpoint=endpoint, credential=DefaultAzureCredential(), selects=selects)
 ```
 
diff --git a/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/__init__.py b/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/__init__.py
index 87873c1bd5dc..3bf8e865e67c 100644
--- a/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/__init__.py
+++ b/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/__init__.py
@@ -10,6 +10,7 @@
     SettingSelector,
     WatchKey,
 )
+from ._constants import NULL_LABEL
 
 from ._version import VERSION
 
@@ -20,4 +21,5 @@
     "AzureAppConfigurationKeyVaultOptions",
     "SettingSelector",
     "WatchKey",
+    "NULL_LABEL",
 ]
diff --git a/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/_constants.py b/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/_constants.py
index 3e68591bb46c..0544014c8514 100644
--- a/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/_constants.py
+++ b/sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/_constants.py
@@ -69,3 +69,11 @@
 # Miscellaneous Constants
 # ------------------------------------------------------------------------
 NULL_CHAR = "\0"
+
+# ------------------------------------------------------------------------
+# Label Constants
+# ------------------------------------------------------------------------
+NULL_LABEL = NULL_CHAR
+"""Represents the null label (No Label) in Azure App Configuration. Use this constant
+with :class:`~azure.appconfiguration.provider.SettingSelector` to select configuration
+settings that have no label assigned."""
diff --git a/sdk/appconfiguration/azure-appconfiguration-provider/tests/test_setting_selector.py b/sdk/appconfiguration/azure-appconfiguration-provider/tests/test_setting_selector.py
index 0011f62ca932..c77620a0b754 100644
--- a/sdk/appconfiguration/azure-appconfiguration-provider/tests/test_setting_selector.py
+++ b/sdk/appconfiguration/azure-appconfiguration-provider/tests/test_setting_selector.py
@@ -7,6 +7,7 @@
 import pytest
 from azure.appconfiguration.provider._models import SettingSelector
 from azure.appconfiguration.provider._constants import NULL_CHAR
+from azure.appconfiguration.provider import NULL_LABEL
 
 
 class TestSettingSelector:
@@ -91,3 +92,11 @@ def test_setting_selector_different_label_filters(self):
 
         selector = SettingSelector(key_filter="*", tag_filters=["tag=value"])
         assert selector.label_filter == NULL_CHAR
+
+    def test_null_label_constant(self):
+        """Test that NULL_LABEL constant is exported and equals the null character."""
+        assert NULL_LABEL == "\0"
+        assert NULL_LABEL == NULL_CHAR
+
+        selector = SettingSelector(key_filter="*", label_filter=NULL_LABEL)
+        assert selector.label_filter == NULL_LABEL