bytes.rpartition(sep)
bytearray.rpartition(sep)
Split the sequence at the last occurrence of sep, and return a 3-tuple containing the part before the separator, the separator, and the part after the separator. If the separator is not found, return a 3-tuple containing a copy of the original sequence, followed by two empty bytes or bytearray objects.
The separator to search for may be any bytes-like object.
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