- A new style of warning can be emitted which will "filter" up to

N occurrences of a parameterized string.   This allows parameterized
warnings that can refer to their arguments to be delivered a fixed
number of times until allowing Python warning filters to squelch them,
and prevents memory from growing unbounded within Python's
warning registries.
fixes #3178

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/sqlalchemy/sql/schema.py b/lib/sqlalchemy/sql/schema.py
index c8e815d24..8225a3533 100644
--- a/lib/sqlalchemy/sql/schema.py
+++ b/lib/sqlalchemy/sql/schema.py
@@ -1124,8 +1124,12 @@ class Column(SchemaItem, ColumnClause):
             else:
                 if getattr(self.type, '_warn_on_bytestring', False):
                     if isinstance(self.default, util.binary_type):
-                        util.warn("Unicode column received non-unicode "
-                                  "default value.")
+                        util.warn(
+                            "Unicode column '%s' has non-unicode "
+                            "default value %r specified." % (
+                                self.key,
+                                self.default
+                            ))
                 args.append(ColumnDefault(self.default))
 
         if self.server_default is not None: