Best way to check that you are at the beginning (the end) of an iterable?
tjreedy at udel.edu
Wed Sep 7 21:08:11 EDT 2011
On 9/7/2011 8:24 PM, Steven D'Aprano wrote:
> I don't think this question is meaningful. There are basically two
> fundamental types of iterables, sequences and iterators.
And non-sequence iterables like set and dict.
> Sequences have random access and a length, so if the "start" and "end" of
> the sequence is important to you, just use indexing:
> beginning = sequence
> end = sequence[-1]
> for i, x in enumerate(sequence):
> if i == 0: print("at the beginning")
> elif i == len(sequence)-1: print("at the end")
And finite non-sequences can be turned into sequences with list(iterable).
Terry Jan Reedy
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