core, CLI (base), tools (common/data_format): typing/core readability

sat/tools/common/data_format.py

@@ -20,6 +20,8 @@
 """ tools common to backend and frontends """
 #  FIXME: json may be more appropriate than manual serialising like done here
 
+from typing import Any
+
 from sat.core import exceptions
 import json
 
@@ -133,7 +135,7 @@ def serialise(data):
     """
     return json.dumps(data, ensure_ascii=False, default=str)
 
-def deserialise(serialised_data, default=None, type_check=dict):
+def deserialise(serialised_data: str, default: Any = None, type_check: type = dict):
     """Deserialize data from bridge
 
     @param serialised_data(unicode): data to deserialise