Feature suggestion -- return if true

Sun Apr 17 00:21:53 EDT 2011

Chris Angelico wrote:
> def fac(n):
> # attempt to get from a cache
> return? cache[n]
> # not in cache, calculate the value
> ret=1 if n<=1 else fac(n-1)*n
> # and cache and return it
> cache[n]=ret; return ret

My idiom for fetching from a cache looks like this:
 def get_from_cache(x):
 y = cache.get(x)
 if not y:
 y = compute_from(x)
 cache[x] = y
 return y
which doesn't require any conditional returns.
-- 
Greg