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C++ Iterators Reverse IteratorsA reverse iterator is made from a bidirectional, or random access iterator which it keeps as a member which can be accessed through base() . To iterate backwards use rbegin() and rend() as the iterators for the end of the collection, and the start of the collection respectively.
python iter() method returns the iterator object, it is used to convert an iterable to the iterator. Parameters : obj : Object which has to be converted to iterable ( usually an iterator ). sentinel : value used to represent end of sequence.
Iterators are objects which use the next() method to get the following values of a sequence. Generators are functions that produce or yield a sequence of values using the yield keyword.
Iterators will be faster and have better memory efficiency. Just think of an example of range(1000) vs xrange(1000) .
What is the most efficient way to alternate taking values from different iterators in Python, so that, for example, alternate(xrange(1, 7, 2), xrange(2, 8, 2)) would yield 1, 2, 3, 4, 5, 6. I know one way to implement it would be:
def alternate(*iters):
while True:
for i in iters:
try:
yield i.next()
except StopIteration:
pass
But is there a more efficient or cleaner way? (Or, better yet, an itertools function I missed?)
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