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1. Write binary data

   import struct
   import ctypes
   
   bytes = ctypes.create_string_buffer(8)
   struct.pack_into('i', bytes, 0, 10)
   struct.pack_into('f', bytes, 4, 0.5)
   
   f = open("file.dat", 'wb')
   f.write(bytes)
   f.close()
   

   result

   $ hexdump file.dat 
   0000000 0a 00 00 00 00 00 00 3f                        
   0000008