Python: count occurrences in a list using dict comprehension/generator

Question

I want to write some tests to analyse the efficiency of different operations in python, namely a comparison of dictionary comprehensions and dict generators.

To test

Answer 1

You can do it this way:

>>> words=['this','that','is','if','that','is','if','this','that']
>>> {i:words.count(i) for i in words}
{'this': 2, 'is': 2, 'if': 2, 'that': 3}