Do not use sys.stdout in PSDraw

Tests/test_psdraw.py

@@ -5,8 +5,6 @@ import sys
 from io import BytesIO
 from pathlib import Path
 
-import pytest
-
 from PIL import Image, PSDraw
 
 
@@ -49,15 +47,14 @@ def test_draw_postscript(tmp_path: Path) -> None:
     assert os.path.getsize(tempfile) > 0
 
 
-@pytest.mark.parametrize("buffer", (True, False))
-def test_stdout(buffer: bool) -> None:
+def test_stdout() -> None:
     # Temporarily redirect stdout
     old_stdout = sys.stdout
 
     class MyStdOut:
         buffer = BytesIO()
 
-    mystdout: MyStdOut | BytesIO = MyStdOut() if buffer else BytesIO()
+    mystdout = MyStdOut()
 
     sys.stdout = mystdout
 
@@ -67,6 +64,4 @@ def test_stdout(buffer: bool) -> None:
     # Reset stdout
     sys.stdout = old_stdout
 
-    if isinstance(mystdout, MyStdOut):
-        mystdout = mystdout.buffer
-    assert mystdout.getvalue() != b""
+    assert mystdout.buffer.getvalue() != b""

src/PIL/PSDraw.py

@@ -17,7 +17,7 @@
 from __future__ import annotations
 
 import sys
-from typing import TYPE_CHECKING
+from typing import IO, TYPE_CHECKING
 
 from . import EpsImagePlugin
 
@@ -28,15 +28,12 @@ from . import EpsImagePlugin
 class PSDraw:
     """
     Sets up printing to the given file. If ``fp`` is omitted,
-    ``sys.stdout.buffer`` or ``sys.stdout`` is assumed.
+    ``sys.stdout.buffer`` is assumed.
     """
 
-    def __init__(self, fp=None):
+    def __init__(self, fp: IO[bytes] | None = None) -> None:
         if not fp:
-            try:
-                fp = sys.stdout.buffer
-            except AttributeError:
-                fp = sys.stdout
+            fp = sys.stdout.buffer
         self.fp = fp
 
     def begin_document(self, id: str | None = None) -> None: