Another effective technique for making readable, maintainable code is to break the list comprehension out into a generator (as a closure): This example…: a

Another effective technique for making readable, maintainable code is to break the list comprehension out into a generator (as a closure): This example…: a = … vs = [ v(x) for b in a.f() for x in b if x and c1(x) and not c2(x) ] …becomes: a = … def each_v(): for b in a.f(): for x in b: if not c1(x): # comment continue if c2(x): # comment continue if x: yield v(x) vs = set(each_v()) Line orienting each conditional makes commenting much easier. The collection used for vs is clear. The formatting is less susceptible to being churned up by black. You get to give the thing a name, which helps.