Issue #621 - better error messages on listing queries. Adding check for list type and return error message, take 2. (#666)

Author: timandrews335

openml/runs/functions.py

@@ -713,6 +713,17 @@ def list_runs(offset=None, size=None, id=None, task=None, setup=None,
         List of found runs.
     """
 
+    if id is not None and (not isinstance(id, list)):
+        raise TypeError('id must be of type list.')
+    if task is not None and (not isinstance(task, list)):
+        raise TypeError('task must be of type list.')
+    if setup is not None and (not isinstance(setup, list)):
+        raise TypeError('setup must be of type list.')
+    if flow is not None and (not isinstance(flow, list)):
+        raise TypeError('flow must be of type list.')
+    if uploader is not None and (not isinstance(uploader, list)):
+        raise TypeError('uploader must be of type list.')
+
     return openml.utils._list_all(
         _list_runs, offset=offset, size=size, id=id, task=task, setup=setup,
         flow=flow, uploader=uploader, tag=tag, display_errors=display_errors,