python - Convert list of lists to list of dictionaries

Question

I want to convert a list of lists to a list of dictionaries. I have a way to do it but I suspect there's a better way:

t = [[1,2,3], [4,5,6]]
keys = ['a', 'b', 'c']
[{keys[0]:l[0], keys[1]:l[1], keys[2]:l[2]} for l in t]

with output

[{'a': 1, 'c': 3, 'b': 2}, {'a': 4, 'c': 6, 'b': 5}]

This could be done with a loop, but I bet there's a function to do it even easier. From this answer I'm guessing there's a way to do it with the map command, but I'm not quite sure how.

Answer 1

You can use list comprehension with the dict() constructor and zip:

[dict(zip(keys, l)) for l in t ]

Demo

>>> d = [dict(zip(keys, l)) for l in t ]
>>>
>>> d
[{'a': 1, 'c': 3, 'b': 2}, {'a': 4, 'c': 6, 'b': 5}]
>>>