python dictionary count code example

Example 1: 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})

Example 2: how many keys in a dictionary python

> a = {'foo':42, 'bar':69}
> len(a)
2

Example 3: python counting dictionary

counts = dict()
for i in items:
  counts[i] = counts.get(i, 0) + 1