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'''

Python’s struct module can both create and unpack

packed binary data

'''

# Binary files are useful for processing media,

# accessing data created by C programs, and so on.

# Python's struct module can both create and unpack

# packed binary data to be written to a file in binary mode.

import struct

packed = struct.pack('>i4sh', 7, b'spam', 8)

print(packed)

file = open('data.bin', 'wb') # Open binary output file

print(file.write(packed)) # Write packed binary data

file.close()

# Reading binary data back is essentially symmetric

data = open('data.bin', 'rb').read()

print(data)

print(data[4:8]) # Slice bytes in the middle

print(list(data)) # A sequence of 8-bit bytes

print(struct.unpack('>i4sh', data)) # unpack into objects again