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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_iso_packet_buffer_list(transfer_p):
 """ Python-specific helper extracting a list of iso packet buffers. """

    transfer = transfer_p.contents
    offset = 0
    result = []
    append = result.append
    for iso_transfer in _get_iso_packet_list(transfer):
        length = iso_transfer.length
        append(_get_iso_packet_buffer(transfer, offset, length))
        offset += length
    return result