title: AttributeError: 'str' object has no attribute 'get'
body: <p>Having an error I'm not quite sure how to solve, have a nested dictionary where the last item does not contain the asked get and gives an error, Not sure how to fix it.</p>
  
  <p>Very basic code calling on </p>
  
  <pre><code>  for keys in interfaces:
        counters = interfaces[keys].get(u'interfaceCounters', {})
        print keys, "inOctets:", counters.get(u'inOctets', {}), "outOctets:", counters.get(u'outOctets',  {})
  </code></pre>
  
  <p>Here is the output:</p>
  
  <pre><code>  Management1 inOctets: 0 outOctets: 0
    Ethernet2 inOctets: 561926946 outOctets: 49932066
    Ethernet3 inOctets: 561926408 outOctets: 49932764
    Ethernet1 inOctets: 319314970 outOctets: 264840242
    Ethernet6 inOctets: 561897402 outOctets: 49930884
    Ethernet7 inOctets: 561678430 outOctets: 50180896
    Ethernet4 inOctets: 561927603 outOctets: 49931337
    Ethernet5 inOctets: 561926383 outOctets: 49932935
    Vlan1 inOctets:
    Traceback (most recent call last):
      File "ex1.py", line 36, in &lt;module&gt;
        print keys, "inOctets:", counters.get(u'inOctets', '0'), "outOctets:", counters.get(u'outOctets', '0')
    AttributeError: 'str' object has no attribute 'get'
  </code></pre>
  
  <p>Heres a tail end of interfaces:</p>
  
  <pre><code>u'Management1': {u'autoNegotiate': u'off',
                      u'bandwidth': 1000000000,
                      u'burnedInAddress': u'52:54:00:01:02:d3',
                      u'description': u'',
                      u'duplex': u'duplexFull',
                      u'forwardingModel': u'routed',
                      u'hardware': u'ethernet',
                      u'interfaceAddress': [],
                      u'interfaceCounters': {u'inBroadcastPkts': 0,
                                             u'inDiscards': 0,
                                             u'inMulticastPkts': 0,
                                             u'inOctets': 0,
                                             u'inUcastPkts': 0,
                                             u'inputErrorsDetail': {u'alignmentErrors': 0,
                                                                    u'fcsErrors': 0,
                                                                    u'giantFrames': 0,
                                                                    u'runtFrames': 0,
                                                                    u'rxPause': 0,
                                                                    u'symbolErrors': 0},
                                             u'linkStatusChanges': 2,
                                             u'outBroadcastPkts': 0,
                                             u'outDiscards': 0,
                                             u'outMulticastPkts': 0,
                                             u'outOctets': 0,
                                             u'outUcastPkts': 0,
                                             u'outputErrorsDetail': {u'collisions': 0,
                                                                     u'deferredTransmissions': 0,
                                                                     u'lateCollisions': 0,
                                                                     u'txPause': 0},
                                             u'totalInErrors': 0,
                                             u'totalOutErrors': 0},
                      u'interfaceStatistics': {u'inBitsRate': 0.0,
                                               u'inPktsRate': 0.0,
                                               u'outBitsRate': 0.0,
                                               u'outPktsRate': 0.0,
                                               u'updateInterval': 300.0},
                      u'interfaceStatus': u'disabled',
                      u'lastStatusChangeTimestamp': 1245724638.6762877,
                      u'lineProtocolStatus': u'down',
                      u'mtu': 1500,
                      u'name': u'Management1',
                      u'physicalAddress': u'52:54:00:01:02:d3'},
   u'Vlan1': {u'bandwidth': 0,
                u'burnedInAddress': u'52:54:00:01:37:37',
                u'description': u'',
                u'forwardingModel': u'routed',
                u'hardware': u'vlan',
                u'interfaceAddress': [{u'broadcastAddress': u'255.255.255.255',
                                       u'primaryIp': {u'address': u'10.220.88.31',
                                                      u'maskLen': 24},
                                       u'secondaryIps': {}}],
                u'interfaceStatus': u'connected',
                u'lastStatusChangeTimestamp': 1250568992.891673,
                u'lineProtocolStatus': u'up',
                u'mtu': 1500,
                u'name': u'Vlan1',
                u'physicalAddress': u'52:54:00:01:37:37'}}
  </code></pre>