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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 apply_actions(self, actions):
 """ Applies a list of actions to the FEFF Input Set and rewrites modified files. Args: actions [dict]: A list of actions of the form {'file': filename, 'action': moddermodification} or {'dict': feffinput_key, 'action': moddermodification} """

        modified = []
        for a in actions:
            if "dict" in a:
                k = a["dict"]
                modified.append(k)
                self.feffinp[k] = self.modify_object(a["action"], self.feffinp[k])
            elif "file" in a:
                self.modify(a["action"], a["file"])
            else:
                raise ValueError("Unrecognized format: {}".format(a))
        if modified:
            feff = self.feffinp
            feff_input = "\n\n".join(str(feff[k]) for k in
                                     ["HEADER", "PARAMETERS", "POTENTIALS", "ATOMS"]
                                     if k in feff)
            for k, v in six.iteritems(feff):
                with open(os.path.join('.', k), "w") as f:
                    f.write(str(v))

            with open(os.path.join('.', "feff.inp"), "w") as f:
                f.write(feff_input)