pythondictionaryitems

get each value in each key in order in dictionary python

I have a problem with getting values from dictionary. For example, I have the dictionary:

dct={'a':[1,2,3], 'b':[4,5,6], 'c':[7,8,9]}

I want to get each value in each key in order. Output should look like that:

1
4
7
2
5
8
3
6
9

Explanation:
1-first value in key 'a'
4-first value in key 'b'
7-first value in key 'c'
2-second value in key 'a'
5-second value in key 'b'
etc

Thank you in advance!!

I tried this version:

dct={'a':[1,2,3], 'b':[4,5,6], 'c':[7,8,9]}
    
for key, val in dct.items():
  for i in range(len(val)):
    print(val[i])

But it didn't work

Solution

  • This should do the trick:

    from itertools import chain

result = list(chain(*zip(*dct.values())))

    Explanation: we collect values from the dict, zip them, producing something like [(1, 4, 7), (2, 5, 8)...] and then flatten this list with chain