def get_dsa(self, dnstr):
        """Return a previously loaded DSA object by consulting
        the sites dsa_table for the provided DSA dn string

        :return: None if DSA doesn't exist
        """
        if self.dsa_table.keys() in dnstr:
            return self.dsa_table[dnstr]
        return None
dataset/ETHPy150Open byt3bl33d3r/pth-toolkit/lib/python2.7/site-packages/samba/kcc_utils.py/Site.get_dsa/swapped operands of `in`