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Python 2.7 quick reference

20.21. `iter()`: Produce an iterator over a sequence

Given a sequence S, this function returns an iterator that generates the elements of the sequence. For more information, see Section 24.2, “Iterators: Values that can produce a sequence of values”.

>>> listWalker = iter ( [23, 47, 'hike'] )
>>> for x in listWalker: print x,
... 
23 47 hike

In general, the calling sequence is:

iter(s[, sentinel])

If the sentinel argument is omitted, the first argument must be either a sequence value that implements the .__getitem__() method or an instance of a class that has the .__iter__() method.
If you provide a sentinel argument, the s argument must be callable. The iterator returned will call s() with no arguments and generate the values it returns until the return value equals sentinel, at which point it will raise StopIteration.

Next: 20.22. len(): Number of elements

Contents: Python 2.7 quick reference

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John W. Shipman

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Last updated: 2013-04-24 13:51

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