fix formatting

IPython/core/tests/test_exceptiongroup_tb.py

@@ -6,6 +6,7 b' import pytest'
 from tempfile import TemporaryDirectory
 from IPython.testing import tools as tt
 
+
 def _exceptiongroup_common(
     outer_chain: str,
     inner_chain: str,
@@ -60,7 +61,7 b' def _exceptiongroup_common('
         match_lines += [
             "During handling of the above exception, another exception occurred:",
         ]
-    elif inner_chain == 'from':
+    elif inner_chain == "from":
         match_lines += [
             "The above exception was the direct cause of the following exception:",
         ]
@@ -92,7 +93,8 b' def _exceptiongroup_common('
                 error_lines = error_lines[i+1:]
                 break
         else:
-            assert False, f'{expected} not found in cap.stderr'
+            assert False, f"{expected} not found in cap.stderr"
+
 
 @pytest.mark.skipif(
         sys.version_info < (3, 11), reason="Native ExceptionGroup not implemented"
@@ -102,6 +104,7 b' def _exceptiongroup_common('
 def test_native_exceptiongroup(outer_chain, inner_chain) -> None:
     _exceptiongroup_common(outer_chain, inner_chain, native=True)
 
+
 @pytest.mark.parametrize("outer_chain", ["none", "from", "another"])
 @pytest.mark.parametrize("inner_chain", ["none", "from", "another"])
 def test_native_exceptiongroup(outer_chain, inner_chain) -> None: