Web Reference: Jul 11, 2025 · The bytearray () function in Python creates a mutable sequence of bytes, which is essentially an array of integers in the range 0 to 255 (representing byte values). Unlike the immutable bytes type, bytearray allows us to modify its contents after creation, making it useful for tasks like binary data manipulation, file I/O, or network programming. The representation of bytearray objects uses the bytes literal format (bytearray(b'...')) since it is often more useful than e.g. bytearray([46, 46, 46]). You can always convert a bytearray object into a list of integers using list(b). Learn how to create, modify, and use bytearray objects in Python, a data type that allows in-place manipulation of binary data. Compare bytearray with bytes and memoryview, and explore their common and specific methods and operations.
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