human
Solve the following python programming problem given the following code:
def read_client_registrations(body, defhost = None, defport = None) : 
    'Yield client registrations (as Endpoints) from an encoded registration
    message body. The message format is one registration per line, with each
    line being encoded as application/x-www-form-urlencoded. The key "client" is
    required and contains the client address and port (perhaps filled in by
    defhost and defport). The key "client-transport" is optional and defaults to
    "websocket".
    Example:
      client=1.2.3.4:9000&client-transport=websocket
      client=1.2.3.4:9090&client-transport=obfs3|websocket
    ' 
    for line in body.splitlines () : 
        qs = urlparse.parse_qs (line, keep_blank_values = True, strict_parsing = True) 
        def get_unique(key, default = None) : 
            try : 
                vals = qs [key] 
except KeyError : 
                if (default is None) : 
                    raise ValueError (('missing %r key' % key)) 
vals = (default,) 
if (len (vals) != 1) : 
                raise ValueError (('more than one %r key' % key)) 
return vals [0] 
addr = parse_addr_spec (get_unique ('client'), get_unique, defport) 
        transport = get_unique ('client-transport', DEFAULT_CLIENT_TRANSPORT) 
        (yield reg.Endpoint (addr, transport)) 

    
    

    Fix the buggy line: addr = parse_addr_spec (get_unique ('client'), get_unique, defport)
assistant
#Here is Python program to fix the buggy line: addr = parse_addr_spec (get_unique ('client'), get_unique, defport)
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addr = parse_addr_spec (get_unique ('client'), defhost, defport)