circuitpython/tests/basics/io_bytesio_cow.py

# Make sure that write operations on io.BytesIO don't
# change original object it was constructed from.
import io

b = b"foobar"

a = io.BytesIO(b)
a.write(b"1")
print(b)
print(a.getvalue())

b = bytearray(b"foobar")

a = io.BytesIO(b)
a.write(b"1")
print(b)
print(a.getvalue())
py/objstringio: If created from immutable object, follow copy on write policy. Don't create copy of immutable object's contents until .write() is called on BytesIO. 2017-06-05 16:54:21 -04:00			`# Make sure that write operations on io.BytesIO don't`
			`# change original object it was constructed from.`
remove last uses of 'u' prefix 2023-08-22 11:15:46 -04:00			`import io`
py/objstringio: If created from immutable object, follow copy on write policy. Don't create copy of immutable object's contents until .write() is called on BytesIO. 2017-06-05 16:54:21 -04:00
			`b = b"foobar"`

			`a = io.BytesIO(b)`
			`a.write(b"1")`
			`print(b)`
			`print(a.getvalue())`

			`b = bytearray(b"foobar")`

			`a = io.BytesIO(b)`
			`a.write(b"1")`
			`print(b)`
			`print(a.getvalue())`