Which procedure is best?

Question

Python

There is a list of dictionaries in python 2.7

#несколько тысяч объектов с десятком параметров
data = [{'a': 1, 'b': 2},{'a': 2, 'b': 2},{'a': 1, 'b': 100},{'a': 1, 'b': 22},{'a': 3, 'b': 2}]
#Искомые параметры
filtr = {'a': 1}
#Вариант 1
data = [ x for x in data if set(filtr.items()).issubset(set(x.items())) ]
#Вариант 2
data = [ x for x in data if set(x.items()).issuperset(set(filtr.items())) ]
#Вариант 3 
data = list(filter(lambda x:set(filtr.items()).issubset(set(x.items())),data))

Which of the options is best? Maybe it's better not through the list generator?

new_data = []
while len(data)>0:
    item = data.pop()
    if set(filtr.items()).issubset(set(item.items())):
        new_data.insert(0,item)

The point is to get the filtered array.
At this stage, there is no target data set, maybe someone faced a similar task.

Answer 1

Well, wait, what's the problem?