circuitpython/tests/basics/io_iobase.py

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import io
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try:
io.IOBase
except AttributeError:
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print("SKIP")
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raise SystemExit
class MyIO(io.IOBase):
def write(self, buf):
# CPython and uPy pass in different types for buf (str vs bytearray)
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print("write", len(buf))
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return len(buf)
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print("test", file=MyIO())