[New-bugs-announce] [issue24658] open().write() fails on 4 GB+ data (OS X)

Eric O. LEBIGOT report at bugs.python.org
Sat Jul 18 04:59:28 CEST 2015

New submission from Eric O. LEBIGOT:

On OS X, the Homebrew and MacPorts versions of Python 3.4.3 raise an exception when writing a 4 GB bytearray:

>>> open('/dev/null', 'wb').write(bytearray(2**31-1))

>>> open('/dev/null', 'wb').write(bytearray(2**31))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 22] Invalid argument

This has an impact on pickle, in particular (http://stackoverflow.com/questions/31468117/python-3-can-pickle-handle-byte-objects-larger-than-4gb).

components: Interpreter Core
messages: 246878
nosy: lebigot
priority: normal
severity: normal
status: open
title: open().write() fails on 4 GB+ data (OS X)
type: behavior
versions: Python 3.4, Python 3.5

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