Checking Values And Keys In Python

If I have a dictionary like this: dict = {'a': ['Menny','Adam'], 'b': ['Steff','Bentz', 'Arik'], 'c': ['Menny','Stephonich', 'Marry', 'Kenny', 'Mike', 'Pring'] and so on. If I wan

Solution 1:

I'd build an inverse index:

from collections import defaultdict

reverse = defaultdict(set)

for key, valuesin dct.items():
    forvalueinvalues:
        reverse[value].add(key)

Now you can find any value that is shared between keys:

for value, keys in reverse.items():
    if len(keys) > 1:
        print(value, keys)

Demo:

>>>from collections import defaultdict>>>dct = {'a': ['Menny','Adam'], 'b': ['Steff','Bentz', 'Arik'], 'c': ['Menny','Stephonich', 'Marry', 'Kenny', 'Mike', 'Pring']}>>>reverse = defaultdict(set)>>>for key, values in dct.items():...for value in values:...        reverse[value].add(key)...>>>for value, keys in reverse.items():...iflen(keys) > 1:...print(value, keys)... 
Menny {'c', 'a'}

If you want to test two keys, use:

defcheck_keys(dct, key1, key2):
    returnnotset(dct[key1]).isdisjoint(dct[key2])

Demo:

>>> check_keys(dct, 'a', 'c')
True>>> check_keys(dct, 'a', 'b')
False

or, returning the common values:

defvalues_intersection(dct, key1, key2):
    returnset(dct[key1]).intersection(dct[key2])

Demo:

>>> values_intersection(dct, 'a', 'c')
{'Menny'}
>>> values_intersection(dct, 'a', 'b')
set()

Solution 2:

defcheck(value, dictionary, keys):
    returnall(value in dictionary[key] for key in keys)

Demo:

>>>defcheck(value, dictionary, keys):
        return all(value in dictionary[key] for key in keys)

>>>d= {'a': ['Menny','Adam'], 'b': ['Steff','Bentz', 'Arik'], 'c': ['Menny','Stephonich', 'Marry', 'Kenny', 'Mike', 'Pring']}>>>check('Menny', d, ['a', 'b'])
False
>>>check('Menny', d, ['a', 'c'])
True
>>>

If you want to have the keys which shared the values:

def check(value, d):
    keys_found = []
    for k,v in d.items():
        if value in v:
            keys_found.append(k)
    return keys_found

Demo:

>>> defcheck(value, d):
    keys_found = []
    for k,v in d.items():
        if value in v:
            keys_found.append(k)
    return keys_found

>>> check('Menny', d)
['c', 'a']