how can i make a list of dictionary from the dictionary where values are a list?

Question

i have a dictionary with three key-value pairs and in which the values are a list. I want to create a list of the dictionary where the keys are string and values of that dictionary should be the value of list from each dictionary values,

I thought of iterating over that dictionary and do list comprehension where each element is a dictionary but I can't get the value for that key.

cars = {
        'cars' : ['audi', 'bmw', 'xyz'],
        'model' : ['abc', 'qwer', 'rty']
    }

car_list = [{'car': value_audi, 'car-model': value_abc} for car in cars]

how can I get this value_audi and value_abc for each list item?

the result should be like this

car_list = [{'cars': audi, 'car_model': abc}, {'cars': bmw, 'car_model': qwer}, {'cars': xyz, 'car_model': rty}]

Answer 1

Use zip()

Ex.

cars = {
        'cars' : ['audi', 'bmw', 'xyz'],
        'model' : ['abc', 'qwer', 'rty']
    }

result = [{'cars':c,'car_model':m} for c,m in zip(cars['cars'],cars['model']) ]
print(result)

O/P:

[{'cars': 'audi', 'car_model': 'abc'}, {'cars': 'bmw', 'car_model': 'qwer'}, {'cars': 'xyz', 'car_model': 'rty'}]

Answer 2

Use zip(*) :

car_list = [{'car': x, 'car_model': y} for x, y in zip(*cars.values())]

Example :

cars = {
        'cars' : ['audi', 'bmw', 'xyz'],
        'model' : ['abc', 'qwer', 'rty']
    }

car_list = [{'car': x, 'car_model': y} for x, y in zip(*cars.values())]

# [{'car': 'audi', 'car_model': 'abc'}, {'car': 'bmw', 'car_model': 'qwer'}, {'car': 'xyz', 'car_model': 'rty'}]

Answer 3

if you do not want to "hardcode" the keys of your new dicts you can use:

from itertools import cycle

cars = {
        'cars' : ['audi', 'bmw', 'xyz'],
        'model' : ['abc', 'qwer', 'rty']
    }

[dict(e) for e in zip(*[zip(cycle([k]), v) for k, v in cars.items()])]

output:

[{'cars': 'audi', 'model': 'abc'},
 {'cars': 'bmw', 'model': 'qwer'},
 {'cars': 'xyz', 'model': 'rty'}]

Answer 4

Zip() can help you here.

The purpose of zip() is to map the similar index of multiple containers so that they can be used just using as single entity.

cars = {
    'cars' : ['audi', 'bmw', 'xyz'],
    'model' : ['abc', 'qwer', 'rty']
}

result = [{'cars':x,'car_model':y} for x,y in zip(cars['cars'],cars['model']) ]
print(result)

Expected output will be :

[{'cars': 'audi', 'car_model': 'abc'}, {'cars': 'bmw', 'car_model': 'qwer'}, {'cars': 'xyz', 'car_model': 'rty'}]

follow this link for further clarification zip()