python remove duplicate dictionaries from a list

Question

I have a list of dictionaries

l = [
{'firstname': 'joe', 'surname': 'bloggs'},
{'firstname': 'john', 'surname': 'smith'},
{'firstname': 'joe', 'surname': 'bloggs'},
{'firstname': 'jane', 'surname': 'bloggs'}
]

how do i remove duplicates i.e. {'firstname': 'joe', 'surname': 'bloggs'} appears twice so would want it only appearing once?

Asked By: John

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Source

Answer 1

Something like this should do the stuff :

result = [dict(tupleized) for tupleized in set(tuple(item.items()) for item in l)]

first, I transform the inital dict in a list of tuples, then I put them into a set (that removes duplicates entries), and then back into a dict.

Answered By: Cédric Julien

Answer 2

import itertools

import operator

from operator import itemgetter

import pprint

l = [

{'firstname': 'joe', 'surname': 'bloggs'},

{'firstname': 'john', 'surname': 'smith'},

{'firstname': 'joe', 'surname': 'bloggs'},

{'firstname': 'jane', 'surname': 'bloggs'}

]

getvals = operator.itemgetter('firstname', 'surname')

l.sort(key=getvals)

result = []

for k, g in itertools.groupby(l, getvals):

    result.append(g.next())

l[:] = result

pprint.pprint(l)

Answered By: Turkesh Patel

python remove duplicate dictionaries from a list

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