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Python | next method

schedule Aug 12, 2023
Last updated
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Python's `next(~)` method returns the next item in an iterator.

Parameters

1. `iterator` | `iterator`

The iterator for which we should return the next item.

2. `default` | `any` | `optional`

The value to return in case we have reached the end of the iterator.

Return value

The return value depends on the following cases:

Case

Return value

Have NOT exhausted all items in iterator

Next item in iterator

Have exhausted all items in iterator and `default` argument provided

`default` value

Have exhausted all items in iterator and no `default` argument provided

`StopIteration`

error

Examples

Basic usage

To obtain the next item in the iterator `test`:

``` a = ['hi', 'bye', 'see you']# converting the list to an iterator called testtest = iter(a)print(next(test))print(next(test))print(next(test)) hibyesee you ```

Note that each time we call the `next(~)` method we return the next item in the iterator `test`.

Default parameter

To specify default value of `'This is the default value'`:

``` b = ['hi', 'bye', 'see you']# converting the list to an iterator called testtest = iter(b)print(next(test, 'This is the default value'))print(next(test, 'This is the default value'))print(next(test, 'This is the default value'))print(next(test, 'This is the default value')) hibyesee youThis is the default value ```

On the fourth call of the `next(~)` method we return `'This is the default value'` as we have exhausted all items in the iterator `test`.

StopIteration Error

If we do not provide a `default` value and we reach the end of the iterator:

``` c = ['hi', 'bye', 'see you']# converting the list to an iterator called testtest = iter(c)print(next(test))print(next(test))print(next(test))print(next(test)) hibyesee you---------------------------------------------------------------------------StopIteration Traceback (most recent call last)<ipython-input-11-74eba8c03080> in <module> 7 print(next(test)) 8 print(next(test))----> 9 print(next(test))StopIteration: ```

We see that `StopIteration` exception is raised as there are no more items in the iterator `test`.

Published by Arthur Yanagisawa
Edited by 0 others
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