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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def unsure_pyname(pyname, unbound=True):
 """Return `True` if we don't know what this name references"""

    if pyname is None:
        return True
    if unbound and not isinstance(pyname, pynames.UnboundName):
        return False
    if pyname.get_object() == pyobjects.get_unknown():
        return True