Patches item #847857, was opened at 2003-11-23 23:24
Message generated for change (Comment added) made by loewis
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Category: Modules
Group: Python 2.5
>Status: Closed
>Resolution: Out of Date
Priority: 5
Private: No
Submitted By: Matthew Barnes (mfbarnes)
Assigned to: Raymond Hettinger (rhettinger)
Summary: Extend struct.unpack to produce nested tuples
Initial Comment:
This patch extends the struct.unpack format notation to
be able to express groups of data with parentheses.
For example:
>>> data = struct.pack('iiii', 1, 2, 3, 4)
>>> struct.unpack('i(ii)i', data)
(1, (2, 3), 4)
Integral repeat counts can also be applied to groups.
>>> struct.unpack('2(ii)', data)
((1, 2), (3, 4))
In addition, struct.calcsize also handles parentheses
in format strings correctly.
>>> struct.calcsize('4(ii)')
32
No changes were made to struct.pack. It still treats
parentheses as illegal format characters.
I have not yet updated any documentation or tests
associated with struct.calcsize or struct.unpack.
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>Comment By: Martin v. Löwis (loewis)
Date: 2006-11-19 09:41
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This patch is now unfortunately out-of-date, since the struct module was
heavily rewritten.
Also, the original patch lacked documentation changes, and test cases.
mfbarnes, if you are still interested in this feature, please submit a new
patch, which hopefully gets reviewed faster this time.
Rejecting this patch as out-of-date.
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Comment By: Fabian Bieler (fabe3k)
Date: 2005-07-09 19:28
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I would like to see this patch applied to Python.
This functionality would be very usefull for opening binary
files with a given format.
Is there a particular reason why this patch was not
accepted?
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Comment By: Matthew Barnes (mfbarnes)
Date: 2004-12-20 07:43
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I suggested this change on Python-Dev last year
(http://mail.python.org/pipermail/python-dev/2003-November/040391.html).
The use case I put forth at the time was as follows:
Use Case: I have a program written in C that contains a
bunch of aggregate data structures (arrays of structs,
structs containing arrays, etc.) and I'm transmitting these
structures over a socket connection to a Python program that
then unpacks the data using the struct module. Problem is
that I have to unpack the incoming data as
a flat sequence of data elements, and then repartition the
sequence into nested sequences to better reflect how the
data is structured in the C program. It would be more
convenient to express these groupings as I'm unpacking the
raw data.
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Comment By: Raymond Hettinger (rhettinger)
Date: 2004-12-20 04:57
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What are the use cases to warrant this change?
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