On 07/24/2013 01:34 PM, Prasad, Ramit wrote:
I am still not clear on the advantage of views vs. iterators. What
makes d.viewkeys() better than d.iterkeys()? Why did they decide
not to rename d.iterkeys() to d.keys() and instead use d.viewkeys()?
Is the iteration over a set operation on keys really that common a
use case?
From a practical standpoint, iterkeys() is a one-shot deal, while viewkeys()
can be iterated over multiple times:
--> d = {1: 'one', 2: 'two', 3: 'three'}
--> di = d.iterkeys()
--> list(di)
[1, 2, 3]
--> list(di)
[]
--> dv = d.viewkeys()
--> list(dv)
[1, 2, 3]
--> list(dv)
[1, 2, 3]
And views are not sets -- they just support a couple set-like operations.
--
~Ethan~
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