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gh-69528: Distinguish between file modes "wb+" and "rb+" (GH-137834)

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Co-authored-by: Xiang Zhang <angwerzx@126.com>
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Stan Ulbrych 2025-10-21 18:33:30 +01:00 • committed by GitHub
parent 60df1d7e0c
commit 02c1abfc54
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7 changed files with 27 additions and 10 deletions
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Lib/_pyio.py
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@ -1498,6 +1498,7 @@ class FileIO(RawIOBase):
_writable = False
_appending = False
_seekable = None
_truncate = False
_closefd = True
def __init__(self, file, mode='r', closefd=True, opener=None):
@ -1553,6 +1554,7 @@ def __init__(self, file, mode='r', closefd=True, opener=None):
flags = 0
elif 'w' in mode:
self._writable = True
self._truncate = True
flags = os.O_CREAT | os.O_TRUNC
elif 'a' in mode:
self._writable = True
@ -1877,7 +1879,10 @@ def mode(self):
return 'ab'
elif self._readable:
if self._writable:
return 'rb+'
if self._truncate:
return 'wb+'
else:
return 'rb+'
else:
return 'rb'
else: