What is the most Pythonic way to filter a set?

Question

I have list consisting with replacements and I want to do two things:

1. remove duplicates
2. remove all elements by a specific criteria, to be exact I want to remove all elements bigger than a certain value.

I figured I can use filter for 2 and than use set to achieve 1 something like

list(set(filter(lambda x:x<C, l)))

is there a better/more pythonic/more efficient way?

Answer 1

Using list comprehension is maybe more "pythonic".

filtered = [x for x in set(lst) if x < C]

Answer 2

The best two ways to do them are filter:

new_list = list(set(filter(lambda x:x<C, l)))

Or set comprehensions (which many would consider more pythonic, and even more efficient):

list({x for x in l if x < C})

But I guess, if you’re familiar with filter, that you can just stick to it.