获取字典中具有特定值的所有键 Python

Question

Is it possible to get all the keys matching a specific value from a Python dictionary?

For example, I have a dictionary with the following data:

dataset = [

        {'name': 'A', 'age': 37, 'gender': 'M'},
        {'name': 'B', 'age': 20, 'gender': 'F'},
        {'name': 'C', 'age': 17, 'gender': 'M'},
        {'name': 'D', 'age': 19, 'gender': 'F'},
        {'name': 'E', 'age': 30, 'gender': 'F'}
    ]

I would like to filter the dictionary and get all the keys where the Gender='F'.

I run the below line to filter the key 'Gender' for value 'F'.

res = next((sub for sub in dataset if sub['gender'] == 'F'), None)
print(res)

However, I get only 1 key as output.

Output: {'name': 'B', 'age': 27, 'gender': 'F'}

Want this as output:

{'name': 'B', 'age': 20, 'gender': 'F'}
{'name': 'D', 'age': 19, 'gender': 'F'}
{'name': 'E', 'age': 30, 'gender': 'F'}

Answer 1

Just use conditional list comprehension like this:

[i for i in dataset if i['gender'] == 'F']

which should give:

[{'name': 'B', 'age': 20, 'gender': 'F'}, {'name': 'D', 'age': 19, 'gender': 'F'}, {'name': 'E', 'age': 30, 'gender': 'F'}]

Answer 2

I am not sure why you have used the next function, but simple list comprehension will do:

res = [sub for sub in dataset if sub['gender'] == 'F']

Answer 3

You can also try the following code:

dataset = [{'name': 'A', 'age': 37, 'gender': 'M'}, {'name': 'B', 'age': 20, 'gender': 'F'}, {'name': 'C', 'age': 17, 'gender': 'M'}, {'name': 'D', 'age': 19, 'gender': 'F'},{'name': 'E', 'age': 30, 'gender': 'F'} ]
for i in dataset:
    if i['gender']=='F':
        print(i)

Answer 4

and what about if I want to take every female because I want to check the mean, how you can do it? I'm just curious sorry