Martin Panter added the comment:
For the native alignment case (prefix code @), perhaps you can already use the
“ctypes” module, which supports structures with more complicated embedded
fields.
For the the unaligned modes (prefixes =, <, > and !), I am a little
sympathetic. In the past, I wanted to make various structures that extended
from a common base structure:
HSF_VOL_DESC = Struct("< B 5s B")
# Python 3's "Struct.format" is a byte string!
NSR_DESC = Struct(HSF_VOL_DESC.format.decode() + "B")
But I think if Issue 21071 was fixed (change Struct.format to text string, or
perhaps add a new attribute), I would be happy enough writing
NSR_DESC = Struct(HSF_VOL_DESC.format_str + "B")
Transforming Aviv’s examples:
s3 = Struct(s1.format_str + s2.format_str[1:])
s3 = Struct(s1.format_str + "B") # if s2 is not needed on its own
ver2 = Struct(ver1.format_str + "I")
version_a = Struct(start.format_str + union_b.format_str[1:])
----------
nosy: +martin.panter
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<http://bugs.python.org/issue29903>
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