Subsetting a dictionary

[Emile van Sebille]

"Emile van Sebille" <emile at fenx.com> wrote in message
news:993qq3$4bajg$1 at ID-11957.news.dfncis.de...
> Rather than copying and then deleting from the copy, try building a new
> dictionary while adding only those that qualify.
>
> Something like:  (untested)
>
> def subset(self, attr, value):
>                  # Copy semantics
>                  td = {}
without this line...Sorry :{
>                  td.data = self.data.copy()

>                  for ky, val in TrainingData.items():
>                           if ky[attr] == value:
>                                     td[ky] = val
>                  return td
>