Python List Comprehension and ‘not in’

Try this:

[x for x in t if x not in s]

You can nest any for if statements in list comprehensions. Try this identation, to get really long chains of conditionals, with a clearer intuition about what the code is doing.

my_list = [(x,a)
           for x in t
           if x not in s
           if x > 0
           for a in y
           ...]

See?