How to indent Python list-comprehensions?

Question

List comprehensions can be useful in certain situations, but they can also be rather horrible to read.. As a slightly exaggerated example, how would you indent the following?

Answer 1

How about:

allUuids = [x.id for x in self.db.query(schema.allPostsUuid).execute(timeout = 20) 
                   if (x.type == "post" and x.deleted is not False)]

Generally, long lines can be avoided by pre-computing subexpressions into variables, which might add a minuscule performance cost:

query_ids = self.db.query(schema.allPostsUuid).execute(timeout = 20)
allUuids = [x.id for x in query_ids
                   if (x.type == "post" and x.deleted is not False)]

By the way, isn't 'is not False' kind-of superfluous ? Are you worried about differentiating between None and False ? Because otherwise, it suffices to leave the condition as only: if (x.type == "post" and x.deleted)