Bugs item #1483963, was opened at 2006-05-08 13:05
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Christian Hudon (chrish42)
Assigned to: Nobody/Anonymous (nobody)
Summary: struct.unpack problem with @, =, < specifiers
Initial Comment:
When using struct to unpack floats, I'm getting
inconsistent results when using the '<d' specification
instead of '@d' on a little-endian machine (Intel).
Here's a short python snippet that demonstrates the
problem.
import sys, struct
s = '\x00\x00\x00\x00\x00\x00\xf8\x7f'
>>> sys.byteorder
'little'
# This is correct...
>>> struct.unpack('@d', s)
(nan,)
# These should be equivalent for unpacking a single
# double on little-endian arch... but they're not.
>>> struct.unpack('<d', s)
(inf,)
>>> struct.unpack('=d', s)
(inf,)
----------------------------------------------------------------------
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