<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_nexus_switchport_binding(port_id, switch_ip):
 """Lists all bindings for this switch & port."""

    LOG.debug("get_nexus_switchport_binding() called")
    return _lookup_all_nexus_bindings(port_id=port_id,
                                      switch_ip=switch_ip)