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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'} ] 
843
Appending a dictionary to a list with the same key and different values. Using append() method. Using copy() method to list using append() method. Using deepcopy() method to list using append() method.
Python 3.9 has introduced the merge operator (|) in the dict class. Using the merge operator, we can combine dictionaries in a single line of code. We can also merge the dictionaries in-place by using the update operator (|=).
In Python, a dictionary provides method items() which returns an iterable sequence of all elements from the dictionary. The items() method basically converts a dictionary to a list along with that we can also use the list() function to get a list of tuples/pairs.
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'}] You can obtain that result doing this:
x={'Color': ['Red', 'Yellow'], 'Size': ['Small', 'Medium', 'Large']} keys=x.keys() values=x.values() matrix=[] for i in range(len(keys)): cur_list=[] for j in range(len(values[i])): cur_list.append({keys[i]: values[i][j]}) matrix.append(cur_list) y=[] for i in matrix[0]: for j in matrix[1]: y.append(dict(i.items() + j.items())) print y result:
[{'Color': 'Red', 'Size': 'Small'}, {'Color': 'Red', 'Size': 'Medium'}, {'Color': 'Red', 'Size': 'Large'}, {'Color': 'Yellow', 'Size': 'Small'}, {'Color': 'Yellow', 'Size': 'Medium'}, {'Color': 'Yellow', 'Size': 'Large'}] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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