2 files changed, 19 insertions, 0 deletions
diff --git a/lib/sqlalchemy/util/__init__.py b/lib/sqlalchemy/util/__init__.py
index 7c5257b87..d632f7fed 100644
--- a/lib/sqlalchemy/util/__init__.py
+++ b/lib/sqlalchemy/util/__init__.py
@@ -66,6 +66,7 @@ from .compat import itertools_filter  # noqa
 from .compat import itertools_filterfalse  # noqa
 from .compat import namedtuple  # noqa
 from .compat import next  # noqa
+from .compat import nullcontext  # noqa
 from .compat import osx  # noqa
 from .compat import parse_qsl  # noqa
 from .compat import perf_counter  # noqa
diff --git a/lib/sqlalchemy/util/compat.py b/lib/sqlalchemy/util/compat.py
index 1480bbeee..e8c488047 100644
--- a/lib/sqlalchemy/util/compat.py
+++ b/lib/sqlalchemy/util/compat.py
@@ -47,6 +47,24 @@ FullArgSpec = collections.namedtuple(
     ],
 )
 
+
+class nullcontext(object):
+    """Context manager that does no additional processing.
+
+    Vendored from Python 3.7.
+
+    """
+
+    def __init__(self, enter_result=None):
+        self.enter_result = enter_result
+
+    def __enter__(self):
+        return self.enter_result
+
+    def __exit__(self, *excinfo):
+        pass
+
+
 try:
     import threading
 except ImportError: