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while preference is your full right, not k in d could confuse a novice as (not k) in d, while k not in d has no ambiguity

Jesse the Game
– Jesse the Game

2012-12-02 23:59:50 +00:00
Commented Dec 2, 2012 at 23:59
I would even argue that it is the 'pythonic' way as not in is listed as an operator.

Jesse the Game
– Jesse the Game

2012-12-03 00:09:43 +00:00
Commented Dec 3, 2012 at 0:09
Yeah, I think my preference probably comes from learning other languages first, where for something like a containment test you wouldn't have operators for this so you would do something like !a.contains(b). not in may be more pythonic, I just find the concept of two word operators more confusing than using an inverse on a boolean expression.

Andrew Clark
– Andrew Clark

2012-12-03 00:24:39 +00:00
Commented Dec 3, 2012 at 0:24

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