Add retry_if_not_exception_type()

releasenotes/notes/add-retry_except_exception_type-31b31da1924d55f4.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Add ``retry_if_not_exception_type()`` that allows to retry if a raised exception doesn't match given exceptions.

tenacity/__init__.py

@@ -46,6 +46,7 @@
 from .retry import retry_any  # noqa
 from .retry import retry_if_exception  # noqa
 from .retry import retry_if_exception_type  # noqa
+from .retry import retry_if_not_exception_type  # noqa
 from .retry import retry_if_not_result  # noqa
 from .retry import retry_if_result  # noqa
 from .retry import retry_never  # noqa

tenacity/retry.py

@@ -80,6 +80,16 @@ def __init__(self, exception_types=Exception):
         )
 
 
+class retry_if_not_exception_type(retry_if_exception):
+    """Retries except an exception has been raised of one or more types."""
+
+    def __init__(self, exception_types=Exception):
+        self.exception_types = exception_types
+        super(retry_if_not_exception_type, self).__init__(
+            lambda e: not isinstance(e, exception_types)
+        )
+
+
 class retry_unless_exception_type(retry_if_exception):
     """Retries until an exception is raised of one or more types."""
 

tenacity/tests/test_tenacity.py

@@ -780,6 +780,11 @@ def _retryable_test_with_exception_type_io(thing):
     return thing.go()
 
 
+@retry(retry=tenacity.retry_if_not_exception_type(IOError))
+def _retryable_test_if_not_exception_type_io(thing):
+    return thing.go()
+
+
 @retry(
     stop=tenacity.stop_after_attempt(3), retry=tenacity.retry_if_exception_type(IOError)
 )
@@ -921,6 +926,18 @@ def test_retry_if_exception_of_type(self):
             self.assertTrue(isinstance(n, NameError))
             print(n)
 
+    def test_retry_except_exception_of_type(self):
+        self.assertTrue(
+            _retryable_test_if_not_exception_type_io(NoNameErrorAfterCount(5))
+        )
+
+        try:
+            _retryable_test_if_not_exception_type_io(NoIOErrorAfterCount(5))
+            self.fail("Expected IOError")
+        except IOError as err:
+            self.assertTrue(isinstance(err, IOError))
+            print(err)
+
     def test_retry_until_exception_of_type_attempt_number(self):
         try:
             self.assertTrue(