Bytearray is a mutable implementation of an array of bytes. Therefore, appending data to a bytearray object is much faster than to a bytes object because in this last case, every append implies to create (and destroy the previous) new bytes object.



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%%timeit x = b''
x += b'x'



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%%timeit x = bytearray()
x.extend(b'x')



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# Array of bytes = 0
x = bytearray(10)



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x



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len(x)



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for i in range(len(x)):
    x[i] += 1



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x



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# A byte in Python is a 0 <= value <= 255.
x[1] = -1



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# A bytearray can be created from a list
x = bytearray([1,2,3])
x



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import sys
x = bytearray(sys.stdin.read(5).encode())
x

Table of Contents

6. Bytearray