python count keys in dict code example

Example 1: get number of key in dictionary python

#Call len(obj) with a dictionary as obj to count the number 
#of key-value pairs in the dictionary.

a_dictionary = {"a": 1, "b": 2}
print(len(a_dictionary))

OUTPUT:
2

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