chore: update package manager to yarn@4.9.4 and enhance user agent format to include Python version

Author: jimmyn

Monei/monei_client.py

@@ -1,6 +1,7 @@
 import json
 import hmac
 import hashlib
+import sys
 
 # Import specific modules instead of importing from Monei
 import Monei
@@ -16,7 +17,7 @@
 from Monei.exceptions import ApiException
 
 
-DEFAULT_USER_AGENT = f"MONEI/Python/{Monei.__version__}"
+DEFAULT_USER_AGENT = f"MONEI/Python/{Monei.__version__} (Python v{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro})"
 
 
 class MoneiClient(object):

package.json

@@ -30,5 +30,5 @@
     "lint-staged": "^15.4.3",
     "release-it": "^18.1.2"
   },
-  "packageManager": "yarn@4.7.0"
+  "packageManager": "yarn@4.9.4"
 }

test/test_monei_client.py

@@ -267,6 +267,23 @@ def test_default_user_agent_always_set(self):
         # Check that the user agent is set in the API client
         self.assertEqual(client._api_client.user_agent, DEFAULT_USER_AGENT)
 
+    def test_default_user_agent_format_includes_python_version(self):
+        """Test that DEFAULT_USER_AGENT includes Python version in the correct format."""
+        import sys
+        import Monei
+
+        # Check that the user agent follows the expected format: MONEI/Python/2.0.2 (Python v3.12.9)
+        expected_format = f"MONEI/Python/{Monei.__version__} (Python v{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro})"
+        self.assertEqual(DEFAULT_USER_AGENT, expected_format)
+
+        # Verify the format components
+        self.assertTrue(DEFAULT_USER_AGENT.startswith("MONEI/Python/"))
+        self.assertIn(
+            f"(Python v{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro})",
+            DEFAULT_USER_AGENT,
+        )
+        self.assertIn(Monei.__version__, DEFAULT_USER_AGENT)
+
 
 if __name__ == "__main__":
     unittest.main()