How to append multiple elements as values in a dictionary

Question

Lets say i have a dictionary:

favorittForfattere={'Per':'Christie','Kari':'Ibsen', \
 'Liv':'Rowling','Ola':'Ibsen', \
'Anne':'Allende', 'Jens':'Christie'}

With this dictionary i want to create a function where i get the keys and values from that dictionary, and then append them in to a new dictionary which gets created during the function. the values of the previous dictionary will be keys in the new dictionary. the keys from the previous dictionary will be values in the new dictionary.

The expeted outcome would be this

{'Christie': ['Per', 'Jens'], 'Ibsen': ['Kari', 'Ola'], 'Rowling': ['Liv'], 'Allende': ['Anne']}

This is my code so far

def fans(favorittForfattere):
    nyFortegnelse = {}
    for keys, values in favorittForfattere.items():
        nyFortegnelse.update({values:keys})
    print(nyFortegnelse)

How would i solve this problem?

This is the whole code snip so it makes sence

favorittForfattere={'Per':'Christie','Kari':'Ibsen', \
 'Liv':'Rowling','Ola':'Ibsen', \
'Anne':'Allende', 'Jens':'Christie'}

def fans(favorittForfattere):
    nyFortegnelse = {}
    for keys, values in favorittForfattere.items():
        nyFortegnelse.update({values:keys})
    print(nyFortegnelse)

fans(favorittForfattere)

This specific duplicate servers for duplicate values - the one itself links to has answers for unique and duplicate values. — Patrick Artner, Nov 27 '19 at 12:13

score 3 · Accepted Answer · answered Nov 27 '19 at 12:03

Using dict.setdefault with value as list.

Ex:

favorittForfattere={'Per':'Christie','Kari':'Ibsen', 'Liv':'Rowling','Ola':'Ibsen', 'Anne':'Allende', 'Jens':'Christie'}

def fans(favorittForfattere):
    nyFortegnelse = {}
    for key, value in favorittForfattere.items():
        nyFortegnelse.setdefault(value, []).append(key)
    print(nyFortegnelse)

fans(favorittForfattere)

Output:

{'Allende': ['Anne'],
 'Christie': ['Per', 'Jens'],
 'Ibsen': ['Kari', 'Ola'],
 'Rowling': ['Liv']}

It worked! Thank you so much! i will put this as the answer as soon as i can put an answer — Roald Andre Kvarv, Nov 27 '19 at 12:07

score 0 · Answer 2 · answered Nov 27 '19 at 12:08

you can use this code:

favorittForfattere={'Per':'Christie','Kari':'Ibsen','Liv':'Rowling','Ola':'Ibsen','Anne':'Allende', 'Jens':'Christie'}
dictionary={}
for i in favorittForfattere:
    if favorittForfattere[i] not in dictionary:
        dictionary[favorittForfattere[i]]=[]
    dictionary[favorittForfattere[i]].append(i)

output:

{'Christie': ['Per', 'Jens'],
 'Ibsen': ['Kari', 'Ola'],
 'Rowling': ['Liv'],
 'Allende': ['Anne']}

score 0 · Answer 3 · edited Nov 27 '19 at 12:11

0

Something like this?

def fans(favorittForfattere):
    nyFortegnelse = {}
    for k, v in favorittForfattere.items():
        nyFortegnelse[v] = nyFortegnelse.get(v, [])
        nyFortegnelse[v].append(k)
    return nyFortegnelse

edited Nov 27 '19 at 12:11

Patrick Artner

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answered Nov 27 '19 at 12:10

Tobias

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How to append multiple elements as values in a dictionary

3 Answers3