gh-109714: Omit redundant arguments when raising OSError subclasses

errno now defaults to the error code which corresponds to the exception
class, and strerror is derived from it, so passing them explicitly adds
nothing in _pyio, _pyrepl, multiprocessing and shutil.

BlockingIOError in _pyio now passes the number of characters written by
keyword, and FileExistsError in multiprocessing passes only the Windows
error code, from which both errno and strerror are derived.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: serhiy-storchaka

Lib/_pyio.py

@@ -1325,8 +1325,8 @@ def _flush_unlocked(self):
                                    "should not raise BlockingIOError")
             if n is None:
                 raise BlockingIOError(
-                    errno.EAGAIN,
-                    "write could not complete without blocking", 0)
+                    "write could not complete without blocking",
+                    characters_written=0)
             if n > len(self._write_buf) or n < 0:
                 raise OSError("write() returned incorrect number of bytes")
             del self._write_buf[:n]
@@ -1629,8 +1629,7 @@ def __init__(self, file, mode='r', closefd=True, opener=None):
             self._stat_atopen = os.fstat(fd)
             try:
                 if stat.S_ISDIR(self._stat_atopen.st_mode):
-                    raise IsADirectoryError(errno.EISDIR,
-                                            os.strerror(errno.EISDIR), file)
+                    raise IsADirectoryError(filename=file)
             except AttributeError:
                 # Ignore the AttributeError if stat.S_ISDIR or errno.EISDIR
                 # don't exist.

Lib/_pyrepl/terminfo.py

@@ -1,7 +1,6 @@
 """Pure Python curses-like terminal capability queries."""
 
 from dataclasses import dataclass, field
-import errno
 import os
 from pathlib import Path
 import re
@@ -151,7 +150,7 @@ def _read_terminfo_file(terminal_name: str) -> bytes:
         if path.is_file():
             return path.read_bytes()
 
-    raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), filename)
+    raise FileNotFoundError(filename=filename)
 
 
 # Hard-coded terminal capabilities for common terminals

Lib/multiprocessing/shared_memory.py

@@ -11,7 +11,6 @@
 from functools import partial
 import mmap
 import os
-import errno
 import struct
 import secrets
 import types
@@ -143,10 +142,8 @@ def __init__(self, name=None, create=False, size=0, *, track=True):
                         if last_error_code == _winapi.ERROR_ALREADY_EXISTS:
                             if name is not None:
                                 raise FileExistsError(
-                                    errno.EEXIST,
-                                    os.strerror(errno.EEXIST),
-                                    name,
-                                    _winapi.ERROR_ALREADY_EXISTS
+                                    filename=name,
+                                    winerror=_winapi.ERROR_ALREADY_EXISTS
                                 )
                             else:
                                 continue

Lib/shutil.py

@@ -1245,7 +1245,7 @@ def make_archive(base_name, format, root_dir=None, base_dir=None, verbose=0,
         root_dir = os.fspath(root_dir)
         stmd = os.stat(root_dir).st_mode
         if not stat.S_ISDIR(stmd):
-            raise NotADirectoryError(errno.ENOTDIR, 'Not a directory', root_dir)
+            raise NotADirectoryError(filename=root_dir)
 
         if supports_root_dir:
             kwargs['root_dir'] = root_dir