Python Iterators: Difference between revisions
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l = ['a', 'b', 'c'] | l = ['a', 'b', 'c'] | ||
i = iter(l) | i = iter(l) | ||
</syntaxhighlight> | |||
Once created, repeated invocations of the iterator's <code>__next__()</code> method, or by passing it to the built-in function <code>[[Python Language Functions#next|next()]]</code>, return successive items in the stream: | |||
<syntaxhighlight lang='py'> | |||
assert next(i) == 'a' | |||
assert next(i) == 'b' | |||
assert next(i) == 'c' | |||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 04:58, 7 July 2022
External
Internal
TODO
TO PROCESS PyOOP "The Iterator Pattern" + "Iterators" + "The iterator protocol"
Overview
An iterator instance represents a stream of data.
The iterator instances are created from iterable objects with the built-in function iter():
l = ['a', 'b', 'c']
i = iter(l)
Once created, repeated invocations of the iterator's __next__() method, or by passing it to the built-in function next(), return successive items in the stream:
assert next(i) == 'a'
assert next(i) == 'b'
assert next(i) == 'c'