iterator in A Sentence

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    The Iterator pattern decouples algorithms from containers;

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    First, the Iterator protocol- when you write.

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    Then remember that a generator is an Iterator;

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    Iterables are any objects you can get an Iterator from.

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    Here mylist is an iterable because it implements the Iterator protocol.

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    What makes an Iterator special is how it traverses a collection.

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    ERROR grunt. Grunt: ERROR 1066: Unable to open Iterator for alias.

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    When you request an Iterator from a list, it creates a new Iterator.

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    9

    Also, you may want it to be recursive or generic, or to implement it as an Iterator.

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    10

    A generator is exactly the same as any Iterator, except for the way it was written(with function syntax).

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    If an exception StopIteration is raised from within next(), it means there are no more values in the Iterator and the loop is exited.

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    Loops do not necessarily require any special ordering of code for static branch prediction, as only the condition of the loop Iterator is normally used.

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    Until you explicitly call return, which will raise a StopIteration exception(which is also part of the Iterator protocol), or reach the end of the function.

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    14

    I'm not particularly familiar with Python, but I believe it's the same kind of thing as C 's Iterator blocks if you're familiar with those.

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    15

    Other loops need to load the entire collection up front in order to iterate over it, whereas an Iterator only needs to know the current position in the collection.

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    16

    Whereas continuations are able in general to save the state of a computation(i.e., the program's call stack), generators are only able to save the state of iteration over an Iterator.

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    17

    Note that a for loop doesn't know what kind of object it's dealing with- it just follows the Iterator protocol, and is happy to get item after item as it calls next().

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