Refactor typing

Author: Jorewin

pandas/_testing/_warnings.py

@@ -107,15 +107,11 @@ class for all warnings. To raise multiple types of exceptions,
  yield w
  finally:
  if expected_warning:
- if type(expected_warning) == tuple and must_find_all_warnings:
- expected_warning = cast(tuple[type[Warning]], expected_warning)
+ if isinstance(expected_warning, tuple) and must_find_all_warnings:
  match = (
  match
- if type(match) == tuple
- else tuple(
- cast(str | None, match)
- for i in range(len(expected_warning))
- )
+ if isinstance(match, tuple)
+ else tuple(match for i in range(len(expected_warning)))
  )
  for warning_type, warning_match in zip(expected_warning, match):
  _assert_caught_expected_warning(
@@ -126,11 +122,10 @@ class for all warnings. To raise multiple types of exceptions,
  )
  else:
  expected_warning = cast(type[Warning], expected_warning)
- match = cast(
- str,
+ match = (
  "|".join(m for m in match if m)
- if type(match) == tuple
- else match,
+ if isinstance(match, tuple)
+ else match
  )
  _assert_caught_expected_warning(
  caught_warnings=w,