Pythonic way to transform list of pairs to dict

Question

I have a List of pairs like this:

[
    {'Name': 'first_name', 'Value': 'Joe'},
    {'Name': 'last_name', 'Value': 'Smith'},
    {'Name': 'gender', 'Value': 'male'}
]

I want to transform it into a Dict like this:

{
    'first_name': 'Joe',
    'last_name': 'Smith',
    'gender': 'male'
}

I am currently using a simple loop to accomplish this now but I know there is a more Pythonic way to do it. Thoughts?

-Tony

Check this out https://stackoverflow.com/questions/3783530/python-tuple-to-dict — Rami.K, Aug 19 '18 at 03:25

Tony Piazza · Answer 1 · 2018-08-29T11:22:17.177

2

It was easier than I expected:

{pair['Name']:pair['Value'] for pair in source_list}

This uses a feature of Python called a Dict comprehension.

edited Aug 29 '18 at 11:22

answered Aug 19 '18 at 03:26

Tony Piazza

2

Its `pair["Name"]` not `pair["Key"]` – Maximilian Ballard Aug 19 '18 at 03:48
Isn't this called a `dict comprehension` not a `map comprehension`? See pep 274 – Kev Inski Aug 28 '18 at 05:57
@KevInski You are correct. Updated my post to reflect this. Thanks! – Tony Piazza Aug 29 '18 at 11:21

score 0 · Answer 2 · answered Aug 19 '18 at 03:56

0

You can instantiate a dict with the generator output of the values() method on each dict in the list:

dict(d.values() for d in l)

answered Aug 19 '18 at 03:56

blhsing

This requires the values be enumerated in a specific order. That is an invalid assumption. The items returned by the `values()` method will be in a random order prior to python 3.7. And even in python 3.7 the order depends on the order in which the keys were inserted. – Kurtis Rader Aug 19 '18 at 21:09

2 Answers2