no f-strings

IPython/core/async_helpers.py

@@ -60,7 +60,7 b' def _pseudo_sync_runner(coro):'
         return exc.value
     else:
         # TODO: do not raise but return an execution result with the right info.
-        raise RuntimeError(f"{coro.__name__!r} needs a real async loop")
+        raise RuntimeError("{coro_name!r} needs a real async loop".format(coro_name=coro.__name__))
 
 
 def _asyncify(code: str) -> str: