[ python-Bugs-1229380 ] No struct.pack exception for some out of range integers

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Bugs item #1229380, was opened at 2005-06-28 23:30
Message generated for change (Settings changed) made by gbrandl
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Category: Python Library
Group: Python 2.4
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Adal Chiriliuc (adalx)
Assigned to: Bob Ippolito (etrepum)
Summary: No struct.pack exception for some out of range integers

Initial Comment:
struct.pack("B", -1) generates an OverflowError
exception since the B format corresponds to the
"unsigned char" type which can have values between 0
and 255.

But struct.pack("I", -1) and struct.pack("L", -1) do
not generate these errors, even if struct.pack("I",
-1L) and struct.pack("L", -1L) do (notice the final L).


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Comment By: Bob Ippolito (etrepum)
Date: 2006-05-26 13:16

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The test suite now covers this issue and it's fixed in revision 46320.

Note that this is definitely a backwards incompatible change and we might have 
to change it to a warning or something stupid like that.

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Comment By: Georg Brandl (gbrandl)
Date: 2006-05-24 10:25

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Assigning to Bob since he rewrote/extended the struct module
for 2.5.

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Comment By: Ilya Sandler (isandler)
Date: 2006-04-27 14:46

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Also it appears that there is some kind of interference
between range checking and byte-order chars:

  import struct; struct.pack("H", 70000)  #Exception

  import struct; struct.pack(">H", 70000) # no exception

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Comment By: Georg Brandl (gbrandl)
Date: 2006-02-20 20:52

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Attaching patch, raises struct.error. Neal, please look over it.

Note that I find struct's error handling confusing: it's not
clear from the docs in which cases OverflowError is raised,
and in which struct.error.

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