SQLALchemy update ARRAY column [duplicate]

I have a Post model table like this:

class Base(Post):
  ...
  liked_users = Column(ARRAY(Integer))
  ...

I can not add new element to this column using this way:

post = db.query(DbPost).filter(DbPost.id == 1).first()

#print(post.liked_users) => [1,2]


post.liked_users.append(5)
db.commit()

Here I can not add 5 to the column liked_users. How can I solve this problem?