Packer from xdrlib : Packer « XML « Python Tutorial

1. Python Tutorial
2. XML
3. Packer

import xdrlib

def f_packer(name, author, month, year):
    data = xdrlib.Packer()
    data.pack_string(name)
    data.pack_string(author)
    data.pack_uint(month)
    data.pack_uint(year)
    packed = data.get_buffer()
    return packed

def f_unpacker(packer):
    data = xdrlib.Unpacker(packer)
    return data

print "The original values are: 'Andre', 'Author', 10, 2000"
print

packed = f_packer('Andre', 'Author', 10, 2000)
print "The packed data is now defined by:", repr(packed)
print
print "And now, the original data again. (After unpacking it!)"
unpacked = f_unpacker(packed)
print repr(unpacked.unpack_string()), ", ", \
      repr(unpacked.unpack_string()), ", ", \
      unpacked.unpack_uint(), ", ",         \
      unpacked.unpack_uint()
unpacked.done()