fix an errant str check

diff --git a/lib/sqlalchemy/sql/compiler.py b/lib/sqlalchemy/sql/compiler.py
index b2c4a94c07a45ab1d8d55a20423932e02b4f5f67..41ef20a7a8ef2c48fb6bde5f72727aa4b649da2d 100644 (file)
--- a/lib/sqlalchemy/sql/compiler.py
+++ b/lib/sqlalchemy/sql/compiler.py
@@ -2025,7 +2025,7 @@ class DDLCompiler(engine.Compiled):
 
     def get_column_default_string(self, column):
         if isinstance(column.server_default, schema.DefaultClause):
-            if isinstance(column.server_default.arg, str):
+            if isinstance(column.server_default.arg, util.string_types):
                 return "'%s'" % column.server_default.arg
             else:
                 return self.sql_compiler.process(column.server_default.arg)