[util/store] add docstrings

util/store.py

@@ -14,14 +14,28 @@ class Store(object):
         self._data = {}
 
     def set(self, key, value):
-        """Set 'key' to 'value', overwriting 'key' if it exists already"""
+        """Sets key to value, overwriting any existing data for that key
+
+        :param key: the name of the parameter to set
+        :param value: the value to be set
+        """
         self._data[key] = {"value": value, "used": False}
 
     def unused_keys(self):
+        """Returns a list of unused keys
+
+        :return: a list of keys that are set, but never used
+        :rtype: list of strings
+        """
         return [key for key, value in self._data.items() if value["used"] == False]
 
     def get(self, key, default=None):
-        """Return the current value of 'key', or 'default' if 'key' is not set"""
+        """Returns the current value for the specified key, or a default value,
+        if the key is not set
+
+        :param key: the name of the parameter to retrieve
+        :param default: the default value to return, defaults to None
+        """
         if key in self._data:
             self._data[key]["used"] = True
         return self._data.get(key, {"value": default})["value"]