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Revert "gh-129005: _pyio.BufferedIO remove copy on readall (#129454)" (#129500)

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This reverts commit e1c4ba9288.
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Cody Maloney 2025-01-31 00:40:44 -08:00 • committed by GitHub
parent c07ac3c86a
commit 3ebe3d7688
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2 changed files with 0 additions and 5 deletions
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3
Lib/_pyio.py
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@ -1062,9 +1062,6 @@ class BufferedReader(_BufferedIOMixin):
if chunk is None: if chunk is None:
return buf[pos:] or None return buf[pos:] or None
else: else:
# Avoid slice + copy if there is no data in buf
if not buf:
return chunk
return buf[pos:] + chunk return buf[pos:] + chunk
chunks = [buf[pos:]] # Strip the consumed bytes. chunks = [buf[pos:]] # Strip the consumed bytes.
current_size = 0 current_size = 0

2
Misc/NEWS.d/next/Library/2025-01-29-00-00-01.gh-issue-129005.aV_3O8.rst
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@ -1,2 +0,0 @@
:mod:`!_pyio`: Remove an unnecessary copy when ``_pyio.BufferedReader.read()``
is called to read all data from a file and has no data already in buffer.