PulseStorage now "implements" MutableMapping.

Implementations of __len__ and __iter__ curently raise NotImplementedError s.

Signed-off-by: Lukas Prediger <lukas.prediger@rwth-aachen.de>

qctoolkit/serialization.py

@@ -631,7 +631,7 @@ def deserialize(self, representation: Union[str, Dict[str, Any]]) -> Serializabl
         return serializable
 
 
-class PulseStorage:
+class PulseStorage(MutableMapping):
     StorageEntry = NamedTuple('StorageEntry', [('serialization', str), ('serializable', Serializable)])
 
     def __init__(self,
@@ -687,6 +687,16 @@ def __delitem__(self, identifier: str) -> None:
         except KeyError:
             pass
 
+    def __len__(self) -> None:
+        raise NotImplementedError("len(PulseStorage) has currently no meaningful semantics and is not implemented."
+                                  " If you require this feature, please create a feature request at \n"
+                                  "https://github.com/qutech/qc-toolkit/issues/new")
+
+    def __iter__(self) -> None:
+        raise NotImplementedError("iter(PulseStorage) has currently no meaningful semantics and is not implemented."
+                                  " If you require this feature, please create a feature request at \n"
+                                  "https://github.com/qutech/qc-toolkit/issues/new")
+
     def overwrite(self, identifier: str, serializable: Serializable) -> None:
         """Use this method actively change a pulse"""