[issue17440] Some IO related problems on x86 windows

[Antoine Pitrou]

Antoine Pitrou added the comment:

Bytes objects are immutable, so trying to "copy" them doesn't copy anything actually (it's an optimization):

>>> b = b"x" *10
>>> id(b)
139720033059920
>>> b2 = b[:]
>>> id(b2)
139720033059920

FileIO.read() only calls the underlying read() once, you can check the implementation:
http://hg.python.org/cpython/file/8002f45377d4/Modules/_io/fileio.c#l703

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<http://bugs.python.org/issue17440>
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