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1. Reading binary data

   Reading two 2-byte integers and one 4-byte integer in big-endian format from a file:

   import struct
   
   f = open(filename, "rb")
   s = f.read(8)
   x, y, z = struct.unpack(">hhl", s)
   

   The '>' in the format string forces big-endian data.

   The letter 'h' reads one "short integer" (2 bytes).

   The letter 'l' reads one "long integer" (4 bytes).