On Thu, Nov 1, 2018 at 7:23 PM Robert Vanden Eynde <robertve92@gmail.com> wrote:The two are less connected than you seem to think.Really ? What's the use mainstream use cases for setdefault ?I was often in the case of Alex.Well, defaultdict configures a default when an instance is created, while setdefault() is used when inserting a value.A major issue IMO with defaultdict is that if you try to *read* a non-existing key it will be inserted.