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-rw-r--r--lib/sqlalchemy/testing/warnings.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/testing/warnings.py b/lib/sqlalchemy/testing/warnings.py
index 41f3dbfed..6193acd88 100644
--- a/lib/sqlalchemy/testing/warnings.py
+++ b/lib/sqlalchemy/testing/warnings.py
@@ -10,7 +10,7 @@ def testing_warn(msg, stacklevel=3):
filename = "sqlalchemy.testing.warnings"
lineno = 1
- if isinstance(msg, basestring):
+ if isinstance(msg, util.string_types):
warnings.warn_explicit(msg, sa_exc.SAWarning, filename, lineno)
else:
warnings.warn_explicit(msg, filename, lineno)