On 2016-12-31 01:59, Cameron Simpson wrote:
On 30Dec2016 15:17, Deborah Swanson <pyt...@deborahswanson.net> wrote:
Ever consider using conjunctions?
if len(l1[st]) and not len(l2[st]):
#0 is considered a false -- no need to test for "==0"
#non-0 is considered true -- no need to test for ">0"
#copy l1 to l2
elif not len(l1[st]) and len(l2[st]):
#copy l2 to l1
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Wulfraed Dennis Lee Bieber AF6VN
wlfr...@ix.netcom.com HTTP://wlfraed.home.netcom.com/
That's a neat shortcut, len(a) instead of len(a)!= 0. Thanks!
Also, for almost every python collection (lists, tuples, sets etc), python
boolean logic tests __nonzero__, which works off len() by default.
[snip]
For Python 2, it tries __nonzero__, or __len__ if that fails.
For Python 3, it tries __bool__, or __len__ if that fails.
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