<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_ipv6addr(self, ipv6addr):
 """Remove an IPv6 address from the host. :param str ipv6addr: The IP address to remove """

        for addr in self.ipv6addrs:
            if ((isinstance(addr, dict) and addr['ipv6addr'] == ipv6addr) or
                (isinstance(addr, HostIPv4) and addr.ipv6addr == ipv6addr)):
                self.ipv6addrs.remove(addr)
                break