why are these exec times so different?

[r.e.s.]

"r.e.s." <r.s at XXmindspring.com> wrote ...

gads! as soon as I clicked Send, I saw the obvious.

> def f1(s):
>     """ do outer & inner loop """
>     D = {}
>     for i in xrange(len(s)):
>         for j in xrange(len(s)-i+1):
>             D[s[j:j+i]] = True
>     return len(D)

to be comparable to f2, `D={}` needs to be in the 
inner loop, otherwise D grows much larger --
it's the growth of D that accounts for the timing
difference I was noticing!

sorry for bothering everyone with my "learning 
experience"