x = bytearray(b'abcde')
y = memoryview(x)
y[1:3] = b'yz'
x[1:3] = b'ab'
y[3] = ord(b'e')
x[3] = ord(b'f')
x = bytearray(b'abcde')
while len(x)>0:
x = x[1:]
x = bytearray(b'abcde')
y = memoryview(x)
while len(y)>0:
y = y[1:]
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