struct_biffers.py

#!/usr/bin/env python


import struct
import binascii

s = struct.Struct('I 2s f')
values = (1, 'ab', 2.7)
print 'Original:', values

print
print 'ctypes string buffer'

import ctypes
b = ctypes.create_string_buffer(s.size)
print 'Before   :', binascii.hexlify(b.raw)
s.pack_into(b, 0, *values)
print 'After    :', binascii.hexlify(b.raw)
print 'Unpacked :', s.unpack_from(b, 0)

print
print 'array'

import array
a = array.array('c', '\0' * s.size)
print 'Before   :', binascii.hexlify(a)
s.pack_into(a, 0, *values)
print 'After    :', binascii.hexlify(a)
print 'Unpacked :', s.unpack_from(a, 0)