On Thu, Jun 28, 2018 at 4:23 PM, Greg Ewing <greg.ewing@canterbury.ac.nz> wrote:

Nicolas Rolin wrote:

    student_by_school = {group_by(school): student for school, student in student_school_list}

In the spirit of making the target expression look like
a template for the generated elements,

   {school: [student...] for school, student in student_school_list}

hmm -- this seems a bit non-general -- would this only work for a list? maybe you would want a set, or???

so could be get a defaultdict comprehension with something like:

{ school: (default_factory=list, student) for school, student in student_school_list }

But I can't think of an reasonable syntax to make that work.