Count values for each key in a dictionary when values are in a list or sublist

count_values_dict.py

# Count values in a dictionary when values are in a list 
d2 = {'a': ['I','said','that', 'I'],'b': ['she','was','here']}
from collections import Counter
counts = {k: Counter(v) for k, v in d2.items()}

# Count items in sublists
lst = [['I', 'said', 'that'], ['said', 'I']]
Counter(word for sublist in lst for word in sublist)

# Combining the two
from collections import Counter

d = {'a': [['I', 'said', 'that'], ['said', 'I']],
     'b': [['she', 'is'], ['he', 'was']]}

counts = {k: Counter(word
                     for sublist in lst
                     for word in sublist)
          for k, lst in d.items()}

print(counts)

# output
# {'a': Counter({'I': 2, 'said': 2, 'that': 1}),
# 'b': Counter({'she': 1, 'is': 1, 'he': 1, 'was': 1})}