How to combine 2 lists into a dictionary

Question

I have 2 lists below:

a = ['ymd', 'publisher_name', 'country_name', 'ymd', 'publisher_name', 'country_name', 'ymd', 'publisher_name', 'country_name']
b = ['2022-12-01',  'Media1', 'United Kingdom', '2022-12-01',  'Media1', 'Brazil','2022-12-01', 'Media1', 'Laos']

when I tried to use zip and dict the result is this:

zip(a,b)
dictList=dict(zip(a,b))
print (dictList)

#results (only the last list is printed)

{'ymd': '2022-12-01', 'publisher_name': 'Media1', 'country_name': 'Laos'}

#desired results

{'ymd': '2022-12-01', 'publisher_name': 'Media1', 'country_name': 'United Kingdom'},
{'ymd': '2022-12-01', 'publisher_name': 'Media1', 'country_name': 'Brazil'},
{'ymd': '2022-12-01', 'publisher_name': 'Media1', 'country_name': 'Laos'}

You need to somehow tell Python that it has to split into 3 different dicts. Right now you are creating a single dictionary, and because a dict can not contain duplicate keys, you are seeing only the last values. — matszwecja, Jan 12 '23 at 09:26
Your approach for the conversion is correct, the question should be how to split a list into groups of 3 items. — VPfB, Jan 12 '23 at 09:27

score 1 · Answer 1 · answered Jan 12 '23 at 23:16

1

you can use this example it will going to work and combine 2 lists into a dictionary

final_list = [{a:b for a,b in zip(a[i:i+3], b[i:i+3])} for i in range(0, len(a), 3)]

answered Jan 12 '23 at 23:16

tomerar

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score 0 · Answer 2 · answered Jan 12 '23 at 09:28

you have almost got it but you need to pass pieces of length 3 into the function

def solve(a,b) :
    zip(a,b)
    dictList=dict(zip(a,b))
    print (dictList)
    
a = ['ymd', 'publisher_name', 'country_name', 'ymd', 'publisher_name', 'country_name', 'ymd', 'publisher_name', 'country_name']
b = ['2022-12-01',  'Media1', 'United Kingdom', '2022-12-01',  'Media1', 'Brazil','2022-12-01', 'Media1', 'Laos']

for i in range(0, len(a), 3):
    solve(a[i:i+3], b[i:i+3])

score 0 · Accepted Answer · answered Jan 12 '23 at 09:54

It seems that you want multiple dictionaries so let's put them in a list as follows:

a = ['ymd', 'publisher_name', 'country_name', 'ymd', 'publisher_name', 'country_name', 'ymd', 'publisher_name', 'country_name']
b = ['2022-12-01',  'Media1', 'United Kingdom', '2022-12-01',  'Media1', 'Brazil','2022-12-01', 'Media1', 'Laos']

result = [dict()]

for k, v in zip(a, b):
    if len(result[-1]) == 3:
        result.append(dict())
    result[-1][k] = v


print(result)

Output:

[{'ymd': '2022-12-01', 'publisher_name': 'Media1', 'country_name': 'United Kingdom'}, {'ymd': '2022-12-01', 'publisher_name': 'Media1', 'country_name': 'Brazil'}, {'ymd': '2022-12-01', 'publisher_name': 'Media1', 'country_name': 'Laos'}]

Stuart · Answer 4 · 2023-01-12T23:43:42.143

0

Adapt this recipe to divide the zipped lists into chunks, then turn that into a list of dicts.

result = [dict(chunk) for chunk in zip(*[zip(a, b)] * 3)]

edited Jan 12 '23 at 23:43

answered Jan 12 '23 at 23:33

Stuart

9,597
1
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How to combine 2 lists into a dictionary

4 Answers4