Python bytearray() built-in function
From the Python 3 documentation
Return a new array of bytes. The bytearray class is a mutable sequence of integers in the range [...]. It has most of the usual methods of mutable sequences, described in Mutable Sequence Types, as well as most methods that the bytes type has [...].
Examples
>>> bytearray([1, 2, 3])
# bytearray(b'\x01\x02\x03')
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