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-rw-r--r--src/mailman/app/subscriptions.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mailman/app/subscriptions.py b/src/mailman/app/subscriptions.py
index ac6368c2a..620b99c20 100644
--- a/src/mailman/app/subscriptions.py
+++ b/src/mailman/app/subscriptions.py
@@ -26,6 +26,8 @@ __all__ = [
]
+import six
+
from operator import attrgetter
from passlib.utils import generate_password as generate
from sqlalchemy import and_, or_
@@ -108,7 +110,7 @@ class SubscriptionService:
# the parameter can either be an email address or a user id.
query = []
if subscriber is not None:
- if isinstance(subscriber, basestring):
+ if isinstance(subscriber, six.text_type):
# subscriber is an email address.
address = user_manager.get_address(subscriber)
user = user_manager.get_user(subscriber)