bpo-37330: open() no longer accept 'U' in file mode (GH-16959)
open(), io.open(), codecs.open() and fileinput.FileInput no longer
accept "U" ("universal newline") in the file mode. This flag was
deprecated since Python 3.3.diff --git a/Lib/fileinput.py b/Lib/fileinput.py
index c1b0ec9..166c631 100644
--- a/Lib/fileinput.py
+++ b/Lib/fileinput.py
@@ -209,15 +209,10 @@
self._isstdin = False
self._backupfilename = None
# restrict mode argument to reading modes
- if mode not in ('r', 'rU', 'U', 'rb'):
- raise ValueError("FileInput opening mode must be one of "
- "'r', 'rU', 'U' and 'rb'")
- if 'U' in mode:
- import warnings
- warnings.warn("'U' mode is deprecated",
- DeprecationWarning, 2)
+ if mode not in ('r', 'rb'):
+ raise ValueError("FileInput opening mode must be 'r' or 'rb'")
self._mode = mode
- self._write_mode = mode.replace('r', 'w') if 'U' not in mode else 'w'
+ self._write_mode = mode.replace('r', 'w')
if openhook:
if inplace:
raise ValueError("FileInput cannot use an opening hook in inplace mode")