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import uio try: uio.BytesIO except AttributeError: import sys print('SKIP') sys.exit() buf = uio.BytesIO() buf.write(b"foo", 2) print(buf.getvalue()) buf.write(b"foo", 100) print(buf.getvalue()) buf.write(b"foobar", 1, 3) print(buf.getvalue()) buf.write(b"foobar", 1, 100) print(buf.getvalue()) buf.write(b"foobar", 100, 100) print(buf.getvalue())