On Thu, Jun 28, 2018 at 8:25 AM Nicolas Rolin <nicolas.rolin@tiime.fr> wrote:
I use list and dict comprehension a lot, and a problem I often have is to do the equivalent of a group_by operation (to use sql terminology).

For example if I have a list of tuples (student, school) and I want to have the list of students by school the only option I'm left with is to write

    student_by_school = defaultdict(list)
    for student, school in student_school_list:

Thank you for bringing this up. I've been drafting a proposal for a better grouping / group-by operation for a little while. I'm not quite ready to share it, as I'm still researching use cases.

I'm +1 that this task needs improvement, but -1 on this particular solution.