Data frame:
pair = collections.defaultdict(collections.Counter)
e.g.
pair = {\'doc1\': {\'word1\':4, \'word2\':3},
Maybe you are looking for:
>>> from collections import defaultdict >>> pair = defaultdict(dict) >>> pair[3][2]='hello' >>> >>> pair defaultdict(, {3: {2: 'hello'}}) >>> >>> pair[3] {2: 'hello'} >>>