modify the py3k check to check for bytes

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/sqlalchemy/types.py b/lib/sqlalchemy/types.py
index a51e271f9..d5f1d9f14 100644
--- a/lib/sqlalchemy/types.py
+++ b/lib/sqlalchemy/types.py
@@ -587,7 +587,11 @@ class String(Concatenable, TypeEngine):
             if dialect.supports_unicode_binds and self.convert_unicode != 'force':
                 if self._warn_on_bytestring:
                     def process(value):
+                        # Py3K
+                        #if isinstance(value, bytes):
+                        # Py2K
                         if isinstance(value, str):
+                        # end Py2K
                             util.warn("Unicode type received non-unicode bind "
                                       "param value %r" % value)
                         return value