[3.15] gh-139871: Fix 3.15 bytearray.take_bytes example (GH-149520)

[miss-islington]

Currently:

buffer=bytearray(b'abc\ndef')
n=buffer.find(b'\n')
data=bytes(buffer[:n+1])
delbuffer[:n+1]
assertdata==b'abc'Traceback (mostrecentcalllast):
File"<stdin>", line1, in<module>assertdata==b'abc'^^^^^^^^^^^^^^AssertionError

Adding in the \n makes the two match:

buffer=bytearray(b'abc\ndef')
n=buffer.find(b'\n')
data=bytes(buffer[:n+1])
delbuffer[:n+1]
assertdata==b'abc\n'assertbuffer==bytearray(b'def')
buffer=bytearray(b'abc\ndef')
n=buffer.find(b'\n')
data=buffer.take_bytes(n+1)
assertdata==b'abc\n'assertbuffer==bytearray(b'def')

(cherry picked from commit cc5cf14)

Co-authored-by: Cody Maloney cmaloney@users.noreply.github.com

• Issue: Add .take_bytes([n]) a zero-copy path from bytearray to bytes #139871