import dis
import io
import types
import contextlib
import unittest
class DisTests(unittest.TestCase):
        def f(x):
            return x + 1
        code = f.__code__
        try:
            new_code = code.replace(co_linetable=b'\xa0\xa1')
        except (AttributeError, TypeError, ValueError):
            self.skipTest("code.replace(co_linetable=...) not supported on this Python build")
        fn = types.FunctionType(new_code, f.__globals__, name=f.__name__,
                                argdefs=f.__defaults__, closure=f.__closure__)
        buf = io.StringIO()
        with contextlib.redirect_stdout(buf):
            dis.dis(fn)