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gh-129005: Update _pyio.BytesIO to use bytearray.resize on write (#129702)

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Co-authored-by: Victor Stinner <vstinner@python.org>
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Cody Maloney 2025-02-06 02:18:08 -08:00 • committed by GitHub
parent d83a8a26f5
commit 052ca8ffe8
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1 changed files with 2 additions and 4 deletions
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Lib/_pyio.py
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@ -937,10 +937,8 @@ class BytesIO(BufferedIOBase):
return 0
pos = self._pos
if pos > len(self._buffer):
# Inserts null bytes between the current end of the file
# and the new write position.
padding = b'\x00' * (pos - len(self._buffer))
self._buffer += padding
# Pad buffer to pos with null bytes.
self._buffer.resize(pos)
self._buffer[pos:pos + n] = b
self._pos += n
return n