added get_default method

src/datastore.py

@@ -144,6 +144,22 @@ class DataStoreByVariable(AbstractDataStore):
         """
         return self._stride_through_scopes(name, scope)[2]
 
+    def get_default(self, name: str, scope: str, default: Any) -> Any:
+        """
+        Same functionality like the standard get method. But this method adds a default argument that is returned if no
+        data was stored in the data store. Use this function with care, because it will not report any errors and just
+        return the given default value. Currently, there is no statement that reports, if the returned value comes from
+        the data store or the default value.
+        :param name: Name to look for
+        :param scope: scope to search the name for
+        :param default: default value that is return, if no data was found for given name and scope
+        :return: the stored object or the default value
+        """
+        try:
+            return self._stride_through_scopes(name, scope)[2]
+        except (NameNotFoundInDataStore, NameNotFoundInScope):
+            return default
+
     def _stride_through_scopes(self, name, scope, depth=0):
         if depth <= scope.count("."):
             local_scope = scope.rsplit(".", maxsplit=depth)[0]
@@ -267,6 +283,22 @@ class DataStoreByScope(AbstractDataStore):
         """
         return self._stride_through_scopes(name, scope)[2]
 
+    def get_default(self, name: str, scope: str, default: Any) -> Any:
+        """
+        Same functionality like the standard get method. But this method adds a default argument that is returned if no
+        data was stored in the data store. Use this function with care, because it will not report any errors and just
+        return the given default value. Currently, there is no statement that reports, if the returned value comes from
+        the data store or the default value.
+        :param name: Name to look for
+        :param scope: scope to search the name for
+        :param default: default value that is return, if no data was found for given name and scope
+        :return: the stored object or the default value
+        """
+        try:
+            return self._stride_through_scopes(name, scope)[2]
+        except (NameNotFoundInDataStore, NameNotFoundInScope):
+            return default
+
     def _stride_through_scopes(self, name, scope, depth=0):
         if depth <= scope.count("."):
             local_scope = scope.rsplit(".", maxsplit=depth)[0]