[Tutor] Dictionary viceversa

Zachary Ware zachary.ware+pytut at gmail.com
Mon Jul 30 13:28:05 EDT 2018

On Mon, Jul 30, 2018 at 12:20 PM Valerio Pachera <valerio at pbds.eu> wrote:
> I was looking to substiture the cicle for e in new_d like this:
>   [ new_d[e].append(k) if e in new_d else new_d[e].append(k) for e in d[k] ]
> but it can't work because 'new_d[e] = []' is missing.

Have a look at `dict.setdefault` and play around with it; I think it
will help you do what you want.


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