<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_nsxcontroller_ip(self, **kwargs):
 """ Set nsx-controller IP Args: IP (str):
 IPV4 address. callback (function):
 A function executed upon completion of the method. Returns: Return value of `callback`. Raises: None """

        name = kwargs.pop('name')
        ip_addr = str((kwargs.pop('ip_addr', None)))
        nsxipaddress = ip_interface(unicode(ip_addr))
        if nsxipaddress.version != 4:
            raise ValueError('NSX Controller ip must be IPV4')

        ip_args = dict(name=name, address=ip_addr)
        method_name = 'nsx_controller_connection_addr_address'
        method_class = self._brocade_tunnels
        nsxcontroller_attr = getattr(method_class, method_name)
        config = nsxcontroller_attr(**ip_args)
        output = self._callback(config)
        return output