def from_dict(cls, fsa):
        'Instance a new structure from a Python dictionary.'
        fsa = dict(fsa)
        s = cls()
        for key in cls._integer_members:
            setattr(s, key, fsa.get(key))
        ra = fsa.get('RegisterArea', None)
        if ra is not None:
            for index in compat.xrange(0, SIZE_OF_80387_REGISTERS):
                s.RegisterArea[index] = ra[index]
        return s
Instance a new structure from a Python dictionary.