On Jun 28, 10:53 am, [EMAIL PROTECTED] (Alex Martelli) wrote: > Jyotirmoy Bhattacharya <[EMAIL PROTECTED]> wrote: > > print [(m,n) for m in range(5) for n in multab(m) if m>2] > > I was wondering if there is some way to write the if-clause so that it > > is 'hoisted' out of the inner loop and the multab function is not > > called at all for m=0,1,2. That would seem to be important if multab > > were an expensive function.
> Generally, the semantics of: > > x = [<expr> for <F1> if <I2> for <F3>] > > are exactly those of > > x = [] > for <F1> : > if <I2> : > for<F3> : > x.append(expr) > Thanks. That makes things completely clear to me. -- http://mail.python.org/mailman/listinfo/python-list
