Merge pull request pytest-dev#11915 from bluetech/compat-string-types

compat: a couple of minor cleanups

src/_pytest/compat.py

@@ -177,25 +177,13 @@ def get_default_arg_names(function: Callable[..., Any]) -> tuple[str, ...]:
 )
 
 
-def _translate_non_printable(s: str) -> str:
-    return s.translate(_non_printable_ascii_translate_table)
-
-
-STRING_TYPES = bytes, str
-
-
-def _bytes_to_ascii(val: bytes) -> str:
-    return val.decode("ascii", "backslashreplace")
-
-
 def ascii_escaped(val: bytes | str) -> str:
     r"""If val is pure ASCII, return it as an str, otherwise, escape
     bytes objects into a sequence of escaped bytes:
 
     b'\xc3\xb4\xc5\xd6' -> r'\xc3\xb4\xc5\xd6'
 
-    and escapes unicode objects into a sequence of escaped unicode
-    ids, e.g.:
+    and escapes strings into a sequence of escaped unicode ids, e.g.:
 
     r'4\nV\U00043efa\x0eMXWB\x1e\u3028\u15fd\xcd\U0007d944'
 
@@ -206,10 +194,10 @@ def ascii_escaped(val: bytes | str) -> str:
        a UTF-8 string.
     """
     if isinstance(val, bytes):
-        ret = _bytes_to_ascii(val)
+        ret = val.decode("ascii", "backslashreplace")
     else:
         ret = val.encode("unicode_escape").decode("ascii")
-    return _translate_non_printable(ret)
+    return ret.translate(_non_printable_ascii_translate_table)
 
 
 @dataclasses.dataclass

src/_pytest/python.py

@@ -50,7 +50,6 @@
 from _pytest.compat import NOTSET
 from _pytest.compat import safe_getattr
 from _pytest.compat import safe_isclass
-from _pytest.compat import STRING_TYPES
 from _pytest.config import Config
 from _pytest.config import ExitCode
 from _pytest.config import hookimpl
@@ -998,7 +997,7 @@ def _idval_from_hook(self, val: object, argname: str) -> Optional[str]:
     def _idval_from_value(self, val: object) -> Optional[str]:
         """Try to make an ID for a parameter in a ParameterSet from its value,
         if the value type is supported."""
-        if isinstance(val, STRING_TYPES):
+        if isinstance(val, (str, bytes)):
             return _ascii_escaped_by_config(val, self.config)
         elif val is None or isinstance(val, (float, int, bool, complex)):
             return str(val)

src/_pytest/python_api.py

@@ -24,7 +24,6 @@
 from typing import Union
 
 import _pytest._code
-from _pytest.compat import STRING_TYPES
 from _pytest.outcomes import fail
 
 
@@ -721,15 +720,10 @@ def approx(expected, rel=None, abs=None, nan_ok: bool = False) -> ApproxBase:
     elif (
         hasattr(expected, "__getitem__")
         and isinstance(expected, Sized)
-        # Type ignored because the error is wrong -- not unreachable.
-        and not isinstance(expected, STRING_TYPES)  # type: ignore[unreachable]
+        and not isinstance(expected, (str, bytes))
     ):
         cls = ApproxSequenceLike
-    elif (
-        isinstance(expected, Collection)
-        # Type ignored because the error is wrong -- not unreachable.
-        and not isinstance(expected, STRING_TYPES)  # type: ignore[unreachable]
-    ):
+    elif isinstance(expected, Collection) and not isinstance(expected, (str, bytes)):
         msg = f"pytest.approx() only supports ordered sequences, but got: {expected!r}"
         raise TypeError(msg)
     else: