check if key in dictionary python count +1 add if it is code example

Example: check if key in dictionary python count +1 add if it is

from collections import defaultdict
dct = defaultdict(int)

for key in data:
  dct[key] += 1

# defaultdict(<type 'int'>, {'a': 4, 'c': 3, 'b': 2, 'd': 1})