fix formatting

IPython/core/tests/test_exceptiongroup_tb.py

@@ -1,109 +1,112
 import unittest
 import re
 from IPython.utils.capture import capture_output
 import sys
 import pytest
 from tempfile import TemporaryDirectory
 from IPython.testing import tools as tt
 
+
 def _exceptiongroup_common(
     outer_chain: str,
     inner_chain: str,
     native: bool,
 ) -> None:
     pre_raise = "exceptiongroup." if not native else ""
     pre_catch = pre_raise if sys.version_info < (3, 11) else ""
     filestr = f"""
     {"import exceptiongroup" if not native else ""}
     import pytest
 
     def f(): raise ValueError("From f()")
     def g(): raise BaseException("From g()")
 
     def inner(inner_chain):
         excs = []
         for callback in [f, g]:
             try:
                 callback()
             except BaseException as err:
                 excs.append(err)
         if excs:
             if inner_chain == "none":
                 raise {pre_raise}BaseExceptionGroup("Oops", excs)
             try:
                 raise SyntaxError()
             except SyntaxError as e:
                 if inner_chain == "from":
                     raise {pre_raise}BaseExceptionGroup("Oops", excs) from e
                 else:
                     raise {pre_raise}BaseExceptionGroup("Oops", excs)
 
     def outer(outer_chain, inner_chain):
         try:
             inner(inner_chain)
         except {pre_catch}BaseExceptionGroup as e:
             if outer_chain == "none":
                 raise
             if outer_chain == "from":
                 raise IndexError() from e
             else:
                 raise IndexError
 
 
     outer("{outer_chain}", "{inner_chain}")
     """
     with capture_output() as cap:
         ip.run_cell(filestr)
 
     match_lines = []
     if inner_chain == "another":
         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:",
         ]
 
     match_lines += [
         "  + Exception Group Traceback (most recent call last):",
         f"  | {pre_catch}BaseExceptionGroup: Oops (2 sub-exceptions)",
         "    | ValueError: From f()",
         "    | BaseException: From g()",
     ]
 
     if outer_chain == "another":
         match_lines += [
             "During handling of the above exception, another exception occurred:",
             "IndexError",
         ]
     elif outer_chain == "from":
         match_lines += [
             "The above exception was the direct cause of the following exception:",
             "IndexError",
         ]
 
     error_lines = cap.stderr.split("\n")
 
     err_index = match_index = 0
     for expected in match_lines:
         for i,actual in enumerate(error_lines):
             if actual == expected:
                 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"
         )
 @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:
     _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:
     pytest.importorskip("exceptiongroup")
     _exceptiongroup_common(outer_chain, inner_chain, native=False)