Class MinimalRaw

extra_tests/snippets/stdlib_io.py:47–49

# Test that IOBase.isatty() raises ValueError when called on a closed file.
# Minimal subclass that inherits IOBase.isatty() without overriding it.
class MinimalRaw(RawIOBase):
    def readinto(self, b):
        return 0


f = MinimalRaw()