check that select_target_names is list if not None

jbloomlab · Dec 21, 2019 · f72d03b · f72d03b
1 parent 8a65923
commit f72d03b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/alignparse/targets.py b/alignparse/targets.py
@@ -399,7 +399,8 @@ def __init__(self, *, seqsfile, feature_parse_specs,
 
         # get targets from seqsfile
         if select_target_names is not None:
-            if len(select_target_names) < 1:
+            if not (isinstance(select_target_names, list) and
+                    len(select_target_names) >= 1):
                 raise ValueError('`select_target_names` must be none or '
                                  'non-empty list')
         if isinstance(seqsfile, str):