This seems to be my week to ask simple, stupid questions.
Is there any good semantic or philosophical reason that these aren't legal?
>>> "ab" in "cabcd"
1
>>> "xy" in "cabcd"
0
>>> (1, 2) in (0, 1, 2, 3)
1
>>> (9, 8) in (0, 1, 2, 3)
0
Proposed -- the following definition of "in" as a binary operation on
sequence types: a is "in" b if a occurs as a subsequence of b.
I'd like to see Python support this mainly to get rid of the following
common but ugly idiom:
if b.find(a) > -1:
# Do one thing
else:
# Do another
It's really easy to forget and miscode the guard "if b.find(a):".
By contrast, see how much clearer this is:
if a in b:
# Do one thing
else:
# Do another
Thoughts?
--
<a href="http://www.tuxedo.org/~esr/">Eric S. Raymond</a>
I don't like the idea that the police department seems bent on keeping
a pool of unarmed victims available for the predations of the criminal
class.
-- David Mohler, 1989, on being denied a carry permit in NYC
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