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Python | next method

Programming
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Python
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Built-in Functions
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Documentation
schedule Jul 1, 2022
Last updated
local_offer Python
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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

default value

Have exhausted all items in iterator and default argument provided

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 test
test = iter(a)
print(next(test))
print(next(test))
print(next(test))
hi
bye
see 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 test
test = 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'))
hi
bye
see you
This 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 test
test = iter(c)
print(next(test))
print(next(test))
print(next(test))
print(next(test))
hi
bye
see 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.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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