python：遍历列表值并获取json中的键

Question

I have the below json:

{
    "repo_url":"git@github.plugin.git",
    "latest_commit":"bfe7bxxxx",
    "old_commit":"a4ccbyyy",
    "region": {
                    "A":["us-south","us-east"],
                    "B":["au-syd","germany"]
            }
 }

I need to get the key value A if I provide us-east or us-south as input. Similarly I need to get B if I provide au-syd or germany as input. How do I loop through this json construct.

I have tried below code as a starting point

 output_json = json.load(open(file))
            print output_json["region"]

            for majorkey, subdict in output_json["region"]:
                print subdict

But that throws below error

for majorkey, subdict in output_json["region"]:
ValueError: too many values to unpack

Answer 1

You need to use iteritems instead of just iterating over dict

In [3]: for k, v in output_json['region'].iteritems():
   ...:     if 'us-south' in v:
   ...:         print(v.index('us-south'))
   ...:         print(k)
   ...:         
0
A

Answer 2

As stated in the comments. This is what you may want.

For python3.*

for majorkey, subdict in output_json['region'].items():
    print(subdict)

For python2.*

for majorkey, subdict in output_json['region'].iteritems():
    print(subdict)

Answer 3

I tried this in JavaScript, I hope it will work as per your expectation.

 var jsonObj = { "repo_url":"git@github.plugin.git", "latest_commit":"bfe7bxxxx", "old_commit":"a4ccbyyy", "region": { "A":["us-south","us-east"], "B":["au-syd","germany"] } }; function input(val) { for (var i in Object.keys(jsonObj.region)) { for (var j in jsonObj.region[Object.keys(jsonObj.region)[i]]) { if (jsonObj.region[Object.keys(jsonObj.region)[i]][j] == val) { console.log(Object.keys(jsonObj.region)[i]); } } } } input("us-east");