pythonic way of initialization of dict in a for loop

Question

Is there a python way of initialization of a dictionary?

animals = ["dog","cat","cow"]
for x in animals:
    primers_pos[x]={}

Is there something like

(primers_pos[x]={} for x in animals)

Answer 1

You can use a dictionary comprehension (supported in Python 2.7+):

>>> animals = ["dog", "cat", "cow"]
>>> {x: {} for x in animals}
{'dog': {}, 'cow': {}, 'cat': {}}