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[codeLoad]

I am trying to build IP and TCP packets from scratch in Python and am having some difficulty. I started out using ctypes.create_string_buffer() and loading it up with struct.pack_into() but I don't like the hex representation it creates, makes it hard for me to calculate the checksum (converting the hex to something that arithmetic ops can be applied to). I would love it if I could somehow manipulate raw bytes instead of types because I am doing several bitwise ops. Any one have any suggestions for me?