Improve approx scalar repr method for better readability

src/_pytest/python_api.py

@@ -406,7 +406,11 @@
         # If a sensible tolerance can't be calculated, self.tolerance will
         # raise a ValueError.  In this case, display '???'.
         try:
-            vetted_tolerance = f"{self.tolerance:.1e}"
+            if self.tolerance >= 1e-3 and self.tolerance < 1e3:
+                vetted_tolerance = f"{self.tolerance:n}"
+            else:
+                vetted_tolerance = f"{self.tolerance:.1e}"
+
             if (
                 isinstance(self.expected, Complex)
                 and self.expected.imag

src/_pytest/runner.py

@@ -167,7 +167,7 @@
         del sys.last_value
         del sys.last_traceback
         if sys.version_info >= (3, 12, 0):
-            del sys.last_exc
+            del sys.last_exc  # type: ignore[attr-defined]
     except AttributeError:
         pass
     try:
@@ -177,7 +177,7 @@
         sys.last_type = type(e)
         sys.last_value = e
         if sys.version_info >= (3, 12, 0):
-            sys.last_exc = e
+            sys.last_exc = e  # type: ignore[attr-defined]
         assert e.__traceback__ is not None
         # Skip *this* frame
         sys.last_traceback = e.__traceback__.tb_next