Removing a redundant dictionary from a list of dictionaries in Python

Question

Lets say I have a list of dictionaries:

[{'county': 'Lincoln County', 'state': 'SD', 'fips': '46083'}, {'county': 'Minnehaha County', 'state': 'SD', 'fips': '46099'}, {'county': 'Minnehaha County', 'state': 'SD', 'fips': '46099'},...]

In the above example, 2 of the dictionaries in this list are the same. What I want to do is check and see, by the fips key if the value. I know that I can use something like this to check in a dictionary, and in essence, create a new list of only unique entries:

result = {}

for key,value in dictionary.items():
    if value not in result.values():
        result[key] = value

print result

But I am having difficulty apply this to a list of dictionaries. What am I doing wrong here?

for i in dictionary:
    for key,value in dictionary[i].items():
        if value not in result.values():
            result[key] = value

score 2 · Accepted Answer · edited Aug 01 '18 at 13:32

2

You can use a check flag.

Ex:

d = [{'county': 'Lincoln County', 'state': 'SD', 'fips': '46083'}, {'county': 'Minnehaha County', 'state': 'SD', 'fips': '46099'}, {'county': 'Minnehaha County', 'state': 'SD', 'fips': '46099'}]

check_val  = set()
res = []
for i in d:
    if i["fips"] not in check_val:
        res.append(i)
        check_val.add(i["fips"])
print(res)

Output:

[{'county': 'Lincoln County', 'state': 'SD', 'fips': '46083'}, {'county': 'Minnehaha County', 'state': 'SD', 'fips': '46099'}]

edited Aug 01 '18 at 13:32

FHTMitchell

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answered Aug 01 '18 at 13:29

Rakesh

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This worked perfectly and was super easy to implement! – gwydion93 Aug 01 '18 at 13:45
You are welcome :) – Rakesh Aug 01 '18 at 14:15

Removing a redundant dictionary from a list of dictionaries in Python

1 Answers1