loop inside a dictionary python

Question

I am just starting learning Django and Python... It's been 2 months. I'm doing one of my own personal projects and i have a section where i am querying a webservice and passing back the result to the templates.

The webservice is returning a dictionary like below.

x =  {'ID':[{
    'key-1': 'First Name',
    'key-2': 'John'
},{
    'key-1': 'Last Name',
    'key-2': 'Doe'
},{
    'key-1': 'Age',
    'key-2': '25'
}]

I am expecting to iterate the list inside the dictionary and create my own dictionary like the below:

d = {'First Name': 'John', 'Last Name': 'Doe', 'Age': '25' }

I am not sure what am i missing, can someone please help me with learning how to build my dictionary?

Can you show what you have you tried so far and talk about the specific problems did you ran into? — pvg, Sep 14 '17 at 01:08
I tried doing exactly what someone explained over here... https://stackoverflow.com/questions/18289678/python-iterating-through-a-dictionary-with-list-values But it's not the same that i am looking at ... — ppv, Sep 14 '17 at 01:11
If your outer dict was named `x` just do `{el['key-1']: el['key-2'] for el in x['ID']}` — Paul Rooney, Sep 14 '17 at 01:12
I'm not sure I understand your comment. Take a look at [ask] and [MCVE] and update your question with the details. — pvg, Sep 14 '17 at 01:12
@PaulRooney That worked!... Thanks a lot, It's a lot clear now! — ppv, Sep 14 '17 at 01:20

score 1 · Answer 1 · answered Sep 14 '17 at 01:23

Try a dict comprehension and build a new dictionary with key-1 as the key andkey-2` as the value.

x = {'ID':[{
    'key-1': 'First Name',
    'key-2': 'John'
},{
    'key-1': 'Last Name',
    'key-2': 'Doe'
},{
    'key-1': 'Age',
    'key-2': '25'
}]}


print({el['key-1']: el['key-2'] for el in x['ID']})

Result

{'Age': '25', 'First Name': 'John', 'Last Name': 'Doe'}

salparadise · Accepted Answer · 2017-09-14T02:57:26.733

Caveat be aware of ordering rules for values method for dictionaries.

Ordering rules 2.x documentation and 3.x documentation.

EDIT2:

To prevent any weirdness with dictionary ordering and the provided solution, wrap your data into an OrderedDict:

from collections import OrderedDict

x = {'ID':[OrderedDict({
         'key-1': 'First Name',
         'key-2': 'John'
         }),OrderedDict({
         'key-1': 'Last Name',
         'key-2': 'Doe'
         }),OrderedDict({
         'key-1': 'Age',
         'key-2': '25'
        })]}

dict() is a nice option for something like this:

d = dict(each.values() for each in x['ID'])

output:

{'Age': '25', 'First Name': 'John', 'Last Name': 'Doe'}

loop inside a dictionary python

2 Answers2