gh-132962: _pyrepl: Prevent crash on Windows when stdout is redirected

The interactive interpreter (-i) on Windows no longer crashes when
standard output is redirected. The check for `CAN_USE_PYREPL` now
also checks if stdout is a TTY on Windows, falling back to the
basic REPL if it is not.

Author: shuimu5418

Lib/_pyrepl/main.py

@@ -11,6 +11,8 @@
         raise RuntimeError("Windows 10 TH2 or later required")
     if not os.isatty(sys.stdin.fileno()):
         raise OSError(errno.ENOTTY, "tty required", "stdin")
+    if sys.platform == "win32" and not os.isatty(sys.stdout.fileno()):
+        raise OSError(errno.ENOTTY, "tty required", "stdout")
     from .simple_interact import check
     if err := check():
         raise RuntimeError(err)

Misc/NEWS.d/next/Windows/2025-06-13-19-18-00.gh-issue-132962.qOquLB.rst

@@ -0,0 +1,3 @@
+The interactive interpreter (-i) on Windows no longer crashes when standard
+output is redirected. It now correctly falls back to the basic REPL in this
+situation.