code: def __set_basic_auth_string(self, username, password):
          '''
          Creates and sets the authentication string for (write-)accessing the
              Handle Server. No return, the string is set as an attribute to
              the client instance.
  
          :param username: Username handle with index: index:prefix/suffix.
          :param password: The password contained in the index of the username
              handle.
          '''
          auth = b2handle.utilhandle.create_authentication_string(username, password)
          self.__basic_authentication_string = autf __set_basic_auth_string(self, username, password):
          '''
          Creates and sets the authentication string for (write-)accessing the
              Handle Server. No return, the string is set as an attribute to
              the client instance.
  
          :param username: Username handle with index: index:prefix/suffix.
          :param password: The password contained in the index of the username
              handle.
          '''
          auth = b2handle.utilhandle.create_authentication_string(username, password)
          self.__basic_authentication_string = auth
docs: Creates and sets the authentication string for (write-)accessing the
              Handle Server. No return, the string is set as an attribute to
              the client instance.
  
          :param username: Username handle with index: index:prefix/suffix.
          :param password: The password contained in the index of the username
              handle.