<p>你无法访问它,因为你试图访问它的方式是完全错误的。在</p>
<pre><code>>>> import pprint
>>> pprint.pprint(mydict)
{'DescribeClustersResponse': {'DescribeClustersResult': {'Clusters': [{'AllowVersionUpgrade': True,
'AutomatedSnapshotRetentionPeriod': 1,
'AvailabilityZone': 'us-east-1a',
'ClusterCreateTime': 1381812358.833,
'ClusterIdentifier': 'mar5-deliveryreport-new',
'ClusterParameterGroups': [{'ParameterApplyStatus': 'in-sync',
'ParameterGroupName': 'default.redshift-1.0'}],
'ClusterSecurityGroups': [{'ClusterSecurityGroupName': 'default',
'Status': 'active'}],
'ClusterStatus': 'available',
'ClusterSubnetGroupName': None,
'ClusterVersion': '1.0',
'DBName': 'mydb',
'Encrypted': False,
'Endpoint': {'Address': 'mar5-deliveryreport-new.lc.us-east-1.redshift.amazonaws.com',
'Port': 5439},
'MasterUsername': 'root',
'ModifyStatus': None,
'NodeType': 'dw.hs1.xlarge',
'NumberOfNodes': 1,
'PendingModifiedValues': {'AutomatedSnapshotRetentionPeriod': None,
'ClusterType': None,
'ClusterVersion': None,
'MasterUserPassword': None,
'NodeType': None,
'NumberOfNodes': None},
'PreferredMaintenanceWindow': 'tue:08:00-tue:08:30',
'PubliclyAccessible': True,
'RestoreStatus': {'CurrentRestoreRateInMegaBytesPerSecond': 57.3072319201995,
'ElapsedTimeInSeconds': 14035,
'EstimatedTimeToCompletionInSeconds': 0,
'ProgressInMegaBytes': 804307,
'SnapshotSizeInMegaBytes': 804307,
'Status': 'completed'},
'VpcId': None,
'VpcSecurityGroups': []}],
'Marker': None},
'ResponseMetadata': {'RequestId': '233f495b-3576-11e3-83ff-d332123c25c4'}}}
>>> mydict['DescribeClustersResponse']['DescribeClustersResult']['Clusters'][0]['ClusterIdentifier']
'mar5-deliveryreport-new'
</code></pre>