CODEWITHSUNDEEP
pythonlist
Drwhite
Drwhite

Reputation: 1695

sorting list of dictionaries in python

I have this list:

L = [{'status': 1, 'country': 'France'}, {'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'usa'}]

How to sort this list by country (or by status) elements, ASC/DESC.

Upvotes: 2

Views: 196

Answers (3)

John La Rooy
John La Rooy

Reputation: 304493

Pulling the key out to a named function is a good idea for real code, because now you can write tests for it explicitly

def by_country(x):
    # For case insensitive ordering by country
    return x['country'].lower()

L.sort(key=by_country)

Of course you can adapt to use sorted(L, key=...) or reverse=True etc.

Upvotes: 2

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 251196

Use list.sort() to sort the list in-place or sorted to get a new list:

>>> L = [{'status': 1, 'country': 'France'}, {'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'usa'}]
>>> L.sort(key= lambda x:x['country'])
>>> L
[{'status': 1, 'country': 'France'}, {'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'usa'}]

You can pass an optional key word argument reverse = True to sort and sorted to sort in descending order.

As a upper-case alphabet is considered smaller than it's corresponding smaller-case version(due to their ASCII value), so you may have to use str.lower as well.

>>> L.sort(key= lambda x:x['country'].lower())
>>> L
[{'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'France'}, {'status': 1, 'country': 'usa'}]

Upvotes: 9

jamylak
jamylak

Reputation: 133764

>>> from operator import itemgetter
>>> L = [{'status': 1, 'country': 'France'}, {'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'usa'}]
>>> sorted(L, key=itemgetter('country'))
[{'status': 1, 'country': 'France'}, {'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'usa'}]
>>> sorted(L, key=itemgetter('country'), reverse=True)
[{'status': 1, 'country': 'usa'}, {'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'France'}]
>>> sorted(L, key=itemgetter('status'))
[{'status': 1, 'country': 'France'}, {'status': 1, 'country': 'canada'}, {'status': 1, 'country': 'usa'}]

Upvotes: 7

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