Get path of all the elements in dictionary
Question
I have a dictionary in python and want to get path of values param1 or param2, ... to replace these with some other values. Say to get the value of param1 I need to get it like ['OptionSettings'][2]['Value']. Can I have some generic code to do this, which will print the path of all my nodes/leaves below is the dictionary
{
"ApplicationName": "Test",
"EnvironmentName": "ABC-Nodejs",
"CNAMEPrefix": "ABC-Neptune",
"SolutionStackName": "64bit Amazon Linux 2016.03 v2.1.1 running Node.js",
"OptionSettings": [
{
"Namespace": "aws:ec2:vpc",
"OptionName": "AssociatePublicIpAddress",
"Value": "true"
},
{
"Namespace": "aws:elasticbeanstalk:environment",
"OptionName": "EnvironmentType",
"Value": "LoadBalanced"
},
{
"Namespace": "aws:ec2:vpc",
"OptionName": "Subnets",
"Value": "param1"
},
{
"Namespace": "aws:autoscaling:launchconfiguration",
"OptionName": "SecurityGroups",
"Value": "param2"
},
{
"Namespace": "aws:autoscaling:asg",
"OptionName": "MinSize",
"Value": "1"
},
{
"Namespace": "aws:autoscaling:asg",
"OptionName": "MaxSize",
"Value": "4"
},
{
"Namespace": "aws:autoscaling:asg",
"OptionName": "Availability Zones",
"Value": "Any"
},
{
"Namespace": "aws:autoscaling:asg",
"OptionName": "Cooldown",
"Value": "360"
},
{
"Namespace": "aws:autoscaling:launchconfiguration",
"OptionName": "IamInstanceProfile",
"Value": "NepRole"
},
{
"Namespace": "aws:autoscaling:launchconfiguration",
"OptionName": "MonitoringInterval",
"Value": "5 minutes"
},
{
"Namespace": "aws:autoscaling:launchconfiguration",
"OptionName": "RootVolumeType",
"Value": "gp2"
},
{
"Namespace": "aws:autoscaling:launchconfiguration",
"OptionName": "RootVolumeSize",
"Value": "10"
},
{
"Namespace": "aws:elasticbeanstalk:sns:topics",
"OptionName": "Notification Endpoint",
"Value": "sunil.kumar2@pb.com"
},
{
"Namespace": "aws:elasticbeanstalk:hostmanager",
"OptionName": "LogPublicationControl",
"Value": "false"
},
{
"Namespace": "aws:elasticbeanstalk:command",
"OptionName": "DeploymentPolicy",
"Value": "Rolling"
},
{
"Namespace": "aws:elasticbeanstalk:command",
"OptionName": "BatchSizeType",
"Value": "Percentage"
},
{
"Namespace": "aws:elasticbeanstalk:command",
"OptionName": "BatchSize",
"Value": "100"
},
{
"Namespace": "aws:elasticbeanstalk:command",
"OptionName": "HealthCheckSuccessThreshold",
"Value": "Ok"
},
{
"Namespace": "aws:elasticbeanstalk:command",
"OptionName": "IgnoreHealthCheck",
"Value": "false"
},
{
"Namespace": "aws:elasticbeanstalk:command",
"OptionName": "Timeout",
"Value": "600"
},
{
"Namespace": "aws:autoscaling:updatepolicy:rollingupdate",
"OptionName": "RollingUpdateEnabled",
"Value": "false"
},
{
"Namespace": "aws:ec2:vpc",
"OptionName": "ELBSubnets",
"Value": "param3"
},
{
"Namespace": "aws:elb:loadbalancer",
"OptionName": "SecurityGroups",
"Value": "param4"
},
{
"Namespace": "aws:elb:loadbalancer",
"OptionName": "ManagedSecurityGroup",
"Value": "param4"
}
]
}
4 answers
solution1
2 2016-08-29 05:06:12
This is essentially the same question as this:
Print complete key path for all the values of a python nested dictionary
It is essentially the necessary code. What you are going to need to add is the handling of the lists, since you are not presenting simply a key/value structure, and that can be addressed by this question here:
How to check if a variable is a dictionary in python
Which will show you how to check for a type and modify behavior based on the data type. The easiest way to accomplish this is to set up two dummy data types, one defined as an empty list and the other as an empty map and perform "isinstance" checks of the elements against the dummy types to decide on what logic you will want to execute.
Between the two of those answers, you should be able to build the paths you are looking for.
Lost is right, this is not a "write it for me" site.
solution2
1 2020-07-22 21:19:01
I've made a function to "flatten" dict/list nested objects.
def flatten_dict_list(obj, path):
if isinstance(obj, (str, int, float)):
return [(path, obj)]
elif isinstance(obj, dict):
ret = []
for k, v in obj.items():
ret.extend(flatten_dict_list(v, path + [k]))
return ret
elif isinstance(obj, list):
ret = []
for (n, elem) in enumerate(obj):
ret.extend(flatten_dict_list(elem, path + [str(n)]))
return ret
else:
raise ValueError("supported value types: str, int, float")
You can use this function like this
>>> data = {"key1": [1, 2, 3], "key2": {"a": "A", "b": "B", "C": ["c1", "c2"]}}
>>> {"[" + '] ['.join(k) + ']' : v for (k, v) in flatten_dict_list(data, [])}
{'[key1] [0]': 1,
'[key1] [1]': 2,
'[key1] [2]': 3,
'[key2] [a]': 'A',
'[key2] [b]': 'B',
'[key2] [C] [0]': 'c1',
'[key2] [C] [1]': 'c2'}
solution3
-1 2016-08-29 04:34:09
您可以尝试实施类似于广度优先搜索或深度优先搜索的方法。
solution4
-1 2016-08-30 00:02:09
This worked for me
def dict_traverse(self,obj,path):
if isinstance(obj, dict):
for k,v in obj.items():
if isinstance(v, str):
#if v.find('param')!=-1:
print(path+"["+"'"+k+"'"+"]",v)
elif isinstance(v, list):
for elem in v:
self.myvar+=1
path_lst="["+"'"+k+"'"+"]"+"["+str(self.myvar)+"]"
self.dict_traverse(elem,path_lst)
elif isinstance(obj, list):
for elem in obj:
self.dict_traverse(elem,path)
['SolutionStackName'] 64bit Amazon Linux 2016.03 v2.1.1 running Node.js
['OptionSettings'][1]['OptionName'] AssociatePublicIpAddress
['OptionSettings'][1]['Namespace'] aws:ec2:vpc
['OptionSettings'][1]['Value'] true
['OptionSettings'][2]['OptionName'] EnvironmentType
['OptionSettings'][2]['Namespace'] aws:elasticbeanstalk:environment
['OptionSettings'][2]['Value'] LoadBalanced
['OptionSettings'][3]['OptionName'] Subnets
['OptionSettings'][3]['Namespace'] aws:ec2:vpc
['OptionSettings'][3]['Value'] param1
['OptionSettings'][4]['OptionName'] SecurityGroups
['OptionSettings'][4]['Namespace'] aws:autoscaling:launchconfiguration
['OptionSettings'][4]['Value'] param2
['OptionSettings'][5]['OptionName'] MinSize
['OptionSettings'][5]['Namespace'] aws:autoscaling:asg
['OptionSettings'][5]['Value'] 1
['OptionSettings'][6]['OptionName'] MaxSize
['OptionSettings'][6]['Namespace'] aws:autoscaling:asg
['OptionSettings'][6]['Value'] 4
['OptionSettings'][7]['OptionName'] Availability Zones
['OptionSettings'][7]['Namespace'] aws:autoscaling:asg
['OptionSettings'][7]['Value'] Any
['OptionSettings'][8]['OptionName'] Cooldown
['OptionSettings'][8]['Namespace'] aws:autoscaling:asg
['OptionSettings'][8]['Value'] 360
['OptionSettings'][9]['OptionName'] IamInstanceProfile
['OptionSettings'][9]['Namespace'] aws:autoscaling:launchconfiguration
['OptionSettings'][9]['Value'] NepRole
['OptionSettings'][10]['OptionName'] MonitoringInterval
['OptionSettings'][10]['Namespace'] aws:autoscaling:launchconfiguration
['OptionSettings'][10]['Value'] 5 minutes
['OptionSettings'][11]['OptionName'] RootVolumeType
['OptionSettings'][11]['Namespace'] aws:autoscaling:launchconfiguration
['OptionSettings'][11]['Value'] gp2
['OptionSettings'][12]['OptionName'] RootVolumeSize
['OptionSettings'][12]['Namespace'] aws:autoscaling:launchconfiguration
['OptionSettings'][12]['Value'] 10
['OptionSettings'][13]['OptionName'] Notification Endpoint
['OptionSettings'][13]['Namespace'] aws:elasticbeanstalk:sns:topics
['OptionSettings'][13]['Value'] sunil.kumar2@pb.com
['OptionSettings'][14]['OptionName'] LogPublicationControl
['OptionSettings'][14]['Namespace'] aws:elasticbeanstalk:hostmanager
['OptionSettings'][14]['Value'] false
['OptionSettings'][15]['OptionName'] DeploymentPolicy
['OptionSettings'][15]['Namespace'] aws:elasticbeanstalk:command
['OptionSettings'][15]['Value'] Rolling
['OptionSettings'][16]['OptionName'] BatchSizeType
['OptionSettings'][16]['Namespace'] aws:elasticbeanstalk:command
['OptionSettings'][16]['Value'] Percentage
['OptionSettings'][17]['OptionName'] BatchSize
['OptionSettings'][17]['Namespace'] aws:elasticbeanstalk:command
['OptionSettings'][17]['Value'] 100
['OptionSettings'][18]['OptionName'] HealthCheckSuccessThreshold
['OptionSettings'][18]['Namespace'] aws:elasticbeanstalk:command
['OptionSettings'][18]['Value'] Ok
['OptionSettings'][19]['OptionName'] IgnoreHealthCheck
['OptionSettings'][19]['Namespace'] aws:elasticbeanstalk:command
['OptionSettings'][19]['Value'] false
['OptionSettings'][20]['OptionName'] Timeout
['OptionSettings'][20]['Namespace'] aws:elasticbeanstalk:command
['OptionSettings'][20]['Value'] 600
['OptionSettings'][21]['OptionName'] RollingUpdateEnabled
['OptionSettings'][21]['Namespace'] aws:autoscaling:updatepolicy:rollingupdate
['OptionSettings'][21]['Value'] false
['OptionSettings'][22]['OptionName'] ELBSubnets
['OptionSettings'][22]['Namespace'] aws:ec2:vpc
['OptionSettings'][22]['Value'] param3
['OptionSettings'][23]['OptionName'] SecurityGroups
['OptionSettings'][23]['Namespace'] aws:elb:loadbalancer
['OptionSettings'][23]['Value'] param4
['OptionSettings'][24]['OptionName'] ManagedSecurityGroup
['OptionSettings'][24]['Namespace'] aws:elb:loadbalancer
['OptionSettings'][24]['Value'] param4
['EnvironmentName'] ABC-Nodejs
['CNAMEPrefix'] ABC-Neptune
['ApplicationName'] Test
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