Q about tail recursion
Michael Hudson
mwh21 at cam.ac.uk
Sun Feb 27 10:33:38 EST 2000
Robin Becker <robin at jessikat.demon.co.uk> writes:
> I quite often want to use None as an exceptional return eg in the case
> of a list returning function [] might be a legal return and None an
> illegal one. That way I can leave the error handling to the caller. I
> guess I should really be raising an exception though to be truly
> pythonian.
But
def f(x):
if x:
return 1
else:
return None
compiles differently to
def f(x):
if x:
return 1
and the code I've just posted clears the former but moans about the
latter, which I belive was the idea all along (hope so anyway...).
Cheers,
M.
--
very few people approach me in real life and insist on proving they are
drooling idiots. -- Erik Naggum, comp.lang.lisp
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