Combine Python Dictionary Permutations into List of Dictionaries

Question

Given a dictionary that looks like this:

{
    'Color': ['Red', 'Yellow'],
    'Size': ['Small', 'Medium', 'Large']
}

How can I create a list of dictionaries that combines the various values of the first dictionary's keys? What I want is:

[
    {'Color': 'Red', 'Size': 'Small'},
    {'Color': 'Red', 'Size': 'Medium'},
    {'Color': 'Red', 'Size': 'Large'},
    {'Color': 'Yellow', 'Size': 'Small'},
    {'Color': 'Yellow', 'Size': 'Medium'},
    {'Color': 'Yellow', 'Size': 'Large'}
]

Answer 1

I think you want the Cartesian product, not a permutation, in which case itertools.product can help:

>>> from itertools import product
>>> d = {'Color': ['Red', 'Yellow'], 'Size': ['Small', 'Medium', 'Large']}
>>> [dict(zip(d, v)) for v in product(*d.values())]
[{'Color': 'Red', 'Size': 'Small'}, {'Color': 'Red', 'Size': 'Medium'}, {'Color': 'Red', 'Size': 'Large'}, {'Color': 'Yellow', 'Size': 'Small'}, {'Color': 'Yellow', 'Size': 'Medium'}, {'Color': 'Yellow', 'Size': 'Large'}]