Hi Paul You wrote:
> You [the original poster] seem to want a function[to express the > criteria], but it's not obvious to me why you need that. A function has several advantages. 1. It can be reused. 2. It can be tested (a special case of 1). 3. It can be passed as a parameter (a special case of 1). 4. It can be imported from a different Python module (a special case of 1). 5. The code that uses function can be reused (if the function is passed as a parameter). These advantages were sufficient for me at the time to accept the original poster's desire "to retrieve one of its elements that fits a certain criteria". That is not to say that in every case a function is the best way to do things. It's enough that in some (or many) cases using a function is a good thing. -- Jonathan
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