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try:
import io
except ImportError:
print("SKIP")
raise SystemExit
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(type(e), e.args[0] > 0)
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