[Tutor] For - if - else loop; print selective output
ramit.prasad at jpmorgan.com
Thu Oct 25 23:55:05 CEST 2012
> On Thu, Oct 25, 2012 at 3:46 PM, Prasad, Ramit
> <ramit.prasad at jpmorgan.com> wrote:
> > Do you happen to know offhand if there is a difference between
> > `in <list>` vs. `in <tuple>` vs. `in <set>`?
> The "in" comparison (__contains__ method) is equivalent for list and
> tuple. It has to search through the sequence item by item, which makes
> it an O(n) operation. On the other hand, a set/dict uses the hash() of
> an object to map it to a known location in a table (performance
> degrades if there are many collisions). On average, you can check if a
> set/dict contains an item in constant time, i.e. O(1). The amortized
> worst case is O(n).
Sorry, I should have stated that I meant with regards to the
optimization that loads these as a literal constant.
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