micropython/tests/io/bytesio_ext2.py

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try:
import uio as io
except ImportError:
import io
a = io.BytesIO(b"foobar")
try:
a.seek(-10)
except Exception as e:
# CPython throws ValueError, but MicroPython has consistent stream
# interface, so BytesIO raises the same error as a real file, which
# is OSError(EINVAL).
print(repr(e))