Compare dictionary list values to the list of list values using python

Question

I have a dictionary values and list of list values. I need to compare the list values with the dictionary values and get the matched data with key and value pairs.

My dictionary:

res = {
    'cXboTHyIeZaof6x7': ['#de6262', '#ffb88c'],
    '19hyHnlzDMEDJ9N5': ['#ffcc66', '#FFFFFF'],
    'TByXB1YzYSJW2kXO': ['#7A7FBC', '#807CC4'],
    'utTtWdchE2T6vUF5': ['#A3DAC3', '#8BD0D4']
}

My list of list values:

diff_tolistoflist = [
    ['#de6262', '#ffb88c'],
    ['#A3DAC3', '#8BD0D4']
]

Expected output:

test = {
    'cXboTHyIeZaof6x7': ['#de6262', '#ffb88c'],
    'utTtWdchE2T6vUF5': ['#A3DAC3', '#8BD0D4']
}

I need to compare dict values and list of values to get the similar data with key and value pair.

welcome to stackoverflow! please take the [tour](http://stackoverflow.com/tour), read up on [how to ask a question](https://stackoverflow.com/help/asking) and provide the [shortest program necessary to reproduce the problem](https://stackoverflow.com/help/minimal-reproducible-example). also make sure to provide some input and the corresponding desired output. — hiro protagonist, Nov 04 '19 at 10:39
This should answer your question: [Removing entries from a dictionary based on values](https://stackoverflow.com/questions/15158599/removing-entries-from-a-dictionary-based-on-values) — Georgy, Nov 04 '19 at 10:55
This is not my question. This is to take difference between dictionary having list values and list of another values — sangeetha, Nov 04 '19 at 11:03
Checking if an item is in a list is a fairly basic thing to do: [Fastest way to check if a value exists in a list](https://stackoverflow.com/q/7571635/7851470). And combining this check with the code in the duplicate target should be trivial. — Georgy, Nov 04 '19 at 11:19

score 2 · Accepted Answer · answered Nov 04 '19 at 10:53

2

You can use a dictionary comprehension which is quite easy to read:

d = {k:v for k,v in res.items() if v in diff_tolistoflist}
print(d)  
# {'cXboTHyIeZaof6x7': ['#de6262', '#ffb88c'], 'utTtWdchE2T6vUF5': ['#A3DAC3', '#8BD0D4']}

answered Nov 04 '19 at 10:53

Laurent H.

6,316
1
18
40

Saleem Ali · Answer 2 · 2019-11-04T11:04:31.910

0

You can check the the list item with dict val_list

test = {}
for key, val in res.items():
    if val in diff_tolistoflist:
        test[key] = val

Result

>>> test
>>> {'cXboTHyIeZaof6x7': ['#de6262', '#ffb88c'], 'utTtWdchE2T6vUF5': ['#A3DAC3', '#8BD0D4']}

edited Nov 04 '19 at 11:04

answered Nov 04 '19 at 10:46

Saleem Ali

1,363
11
21

1

You don't need that second loop. Just test ```if val in diff_tolistoflist:```. – accdias Nov 04 '19 at 10:53
@accdias, indeed, I have updated the answer, thanks! – Saleem Ali Nov 04 '19 at 10:56
No worries, mate. – accdias Nov 04 '19 at 10:56

score 0 · Answer 3 · answered Nov 04 '19 at 10:50

If the values are unique, we can invert our dictionary:

reversed_dict = {tuple(res[key]): key for key in res}

Keys in the dictionary need to be mutable, so we had to convert them to tuples.

Then we can do a simple lookup of values:

final_result = {}
for v in diff_tolistoflist:
    k = reversed_dict.get(tuple(v))
    if k:
        final_result[k] = v

I've used dict.get so that it doesn't throw an exception if something's wrong.

>>> final_result
{'cXboTHyIeZaof6x7': ['#de6262', '#ffb88c'], 'utTtWdchE2T6vUF5': ['#A3DAC3', '#8BD0D4']}

This solution is case-sensitive. That means, f and F are considered different. To make it case-insensitive, you can convert string to lower when reversing the dictionary and later do the same with the diff_tolistoflist (when declaring it or when looking up the values in the loop).

score 0 · Answer 4 · answered Nov 04 '19 at 11:00

0

Try this, I've user Filter function.

print dict(filter(lambda x:x[1] in diff_tolistoflist,res.items()))

Result:{'cXboTHyIeZaof6x7': ['#de6262', '#ffb88c'], 'utTtWdchE2T6vUF5': ['#A3DAC3', '#8BD0D4']}

answered Nov 04 '19 at 11:00

Narendra Lucky

340
2
13

Compare dictionary list values to the list of list values using python

4 Answers4