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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 OIDC_UNAUTHENTICATED_SESSION_MANAGEMENT_KEY(self):
 """ OPTIONAL. Supply a fixed string to use as browser-state key for unauthenticated clients. """


        # Memoize generated value
        if not self._unauthenticated_session_management_key:
            self._unauthenticated_session_management_key = ''.join(
                random.choice(string.ascii_uppercase + string.digits) for _ in range(100))
        return self._unauthenticated_session_management_key