Question

It may be a classical question in Python, but I haven’t found the answer yet.

I have a list of dictionaries, these dictionaries have similar keys.
It looks like this:

 [{0: myech.MatchingResponse at 0x10d6f7fd0, 
   3: myech.MatchingResponse at 0x10d9886d0,
   6: myech.MatchingResponse at 0x10d6f7d90,
   9: myech.MatchingResponse at 0x10d988ad0},
  {0: myech.MatchingResponse at 0x10d6f7b10,
   3: myech.MatchingResponse at 0x10d6f7f90>}]

I would like to get a new dictionary with [0,3,6,9] as keys, and lists of ” myech.MatchingResponse” as values.

Of course I can do this using a simple loop but I was wondering if there is a more efficient solution.

Answer 1

import collections

result = collections.defaultdict(list)

for d in dictionaries:
    for k, v in d.items():
        result[k].append(v)