使用它们的键从字典列表中获取值

Question

I have a list of dictionaries like below:

What I want to do, is to get the distance value of each element which matches the outer key, which in this case is '500'.

if key == 500: Then print the distance, something like that.

Any help would be appreciated. This is not a duplicate of another post, I tried all the solutions available here, but I failed.

Answer 1

Use a simple for loop:

for e in my_list:
    if 500 in e:
        print(e[500]["distance"])

If you are sure the key 500 is present in all dictionaries, it will give you a list of all the distances:

[e[500]['distance'] for e in my_list]

Answer 2

You can simplify this with list comprehension:

def get_distances(list_, key)
    return [obj[key]['distance'] for obj in list_ if key in obj]]

get_distances(list_, 500)