Add support for formatted list separated values

1 files changed, 6 insertions, 2 deletions

diff --git a/isort/settings.py b/isort/settings.py
index d4e6172d..230636ca 100644
--- a/isort/settings.py
+++ b/isort/settings.py
@@ -144,15 +144,19 @@ def _update_with_config_file(file_path, sections, computed_settings):
         if existing_value_type in (list, tuple):
             existing_data = set(computed_settings.get(access_key, default.get(access_key)))
             if key.startswith('not_'):
-                computed_settings[access_key] = list(existing_data.difference(value.split(",")))
+                computed_settings[access_key] = list(existing_data.difference(_as_list(value)))
             else:
-                computed_settings[access_key] = list(existing_data.union(value.split(",")))
+                computed_settings[access_key] = list(existing_data.union(_as_list(value)))
         elif existing_value_type == bool and value.lower().strip() == "false":
             computed_settings[access_key] = False
         else:
             computed_settings[access_key] = existing_value_type(value)
 
 
+def _as_list(value):
+    return filter(bool, [item.strip() for item in value.split(",")])
+
+
 @lru_cache()
 def _get_config_data(file_path, sections):
     with open(file_path) as config_file: