Create Dict With Multiple Values Out Of Two Lists. Group Multiple Keys Into One

I have two list: lists = ['a','b','c','d','e'] keys = [18,18,3,4,5] what I want is a dictionary like this: {18:['a','b'],3:'c',4:'d',5:'e'} I keep getting this: {18: ['a', 'b', '

Solution 1:

You can try this:

dicts = {key: [] for key in keys}
for k, v in zip(keys, lists):
    dicts[k].append(v)

or

from collections import defaultdict
dicts = defaultdict(list)
for k, v in zip(keys, lists):
    dicts[k].append(v)

Output:

{18: ['a', 'b'], 3: ['c'], 4: ['d'], 5: ['e']}

Solution 2:

Upon reading a post suggestion from stackoverflow:

dictionary = {k: [values[i] for i in [j for j, x in enumerate(keys) if x == k]] for k in set(keys)}

I have solved it.

Solution 3:

You can try this:

output = {}
for index, key in enumerate(keys):
    if not key in output:
        output[key] = lists[index]
    else:
        cur_val = output[key]
        if type(cur_val) == str:
            cur_val = [cur_val]
        
        cur_val.append(lists[index])        
        output[key] = cur_val
print(output)

output:

{18: ['a', 'b'], 3: 'c', 4: 'd', 5: 'e'}

Solution 4:

Easy way is to use zip.

dictionary = dict(zip(keys, values))