CODEWITHSUNDEEP
pythonpython-2.7dictionary
import.zee
import.zee

Reputation: 995

Find common values in dictionary that has keys with multiple values

I am new to python and I have a problem. I am trying to find keys with a value; however, the keys have multiple values.

d = {
    'a': ['john', 'doe', 'jane'], 
    'b': ['james', 'danny', 'john'], 
    'C':['john', 'scott', 'jane'],
}

I want to find the value john in d and get the keys a, b and c or find jane and get keys a and c.

Upvotes: 1

Views: 3810

Answers (2)

George
George

Reputation: 109

So you have to go through the dictionary items and if the find keyword is in the item list then the corresponding key has to be stored in a list and this list has to be displayed.

d = {'a':['john', 'doe', 'jane'], 'b': ['james', 'danny', 'john'], 'C':['john', 'scott', 'jane'],}
find ='jane'

So this is how the logic is written in python

print ([m for m in d.keys() if find in d[m]])

And it will give the following output

['a', 'C']

Upvotes: 1

David Scarlett
David Scarlett

Reputation: 3341

This can easily be done using a list comprehension. It iterates over every key/value pair from the dict's items list, which contains all key/value pairs (for key,val in d.items()) and selects only the pairs where the target string is contained in the value list (if 'john' in val), building a list out of the resulting keys ([ key ... ]).

>>> [ key for key,val in d.items() if 'john' in val ]
['b', 'a', 'C']
>>> [ key for key,val in d.items() if 'jane' in val ]
['a', 'C']

Upvotes: 2

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