How to efficently build a nested dictionary

[Carsten Gaebler]

Carel Fellinger wrote:
> 
> or use newer Python goodies like:
> 
>    m = traffic.setdefault(dir,{}).setdefault(year,{}).setdefault(month,{})
>    m[day] = m[day] + bytes
> 

That's it. Thanks!

cg.