On 31/12/16 00:26, Deborah Swanson wrote:
As Mr. Bieber points out, what I had above greatly benefits from the use
of conjunctions. It now reads:
if not len(l1[st]) and len(l2[st]):
IMHO, "if not len(l)" is a _terrible_ way of spelling "if len(l) == 0"
(mentally, I have to read that as "if length of 'l' is not not equal to
0" - and a double negative won't never cause problems ( ;) )).
Also, in that particular expression, having to know off the top of their
head the precedence of 'not' and 'and' will cause at least some
percentage of your maintenance audience in the future to get it wrong.
What's wrong with:
if len(l1[st]) == 0 and len(l2[st]) != 0:
...
?
There is _no way_ someone could read that and get the wrong idea.
E.
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