Python next() function with Examples

by Online Tutorials Library July 22, 2022

Python next() Function

Python next() function is used to fetch next item from the collection. It takes two arguments an iterator and a default value and returns an element.

This method calls on iterator and throws an error if no item is present. To avoid the error, we can set a default value.

The signature of the function is given below.

Signature

Parameters

iterator: It is an iterator object.

default: This value returns if the element is not present.

Return

It returns an item from the collection.

Let’s see some examples of next() function to understand it’s functionality.

Python next() Function Example 1

Here, we are getting items using next() function. It does not require any loop or indices.

  # Python next() function example  number = iter([256, 32, 82]) # Creating iterator  # Calling function  item = next(number)   # Displaying result  print(item)  # second item  item = next(number)  print(item)  # third item  item = next(number)  print(item)  

Output:

256  32  82

Python next() Function Example 2

This function throws an error when reaches the end of the collection. See the example below.

  # Python next() function example  number = iter([256, 32, 82]) # Creating iterator  # Calling function  item = next(number)   # Displaying result  print(item)  # second item  item = next(number)  print(item)  # third item  item = next(number)  print(item)  # fourth item  item = next(number) # error, no item is present  print(item)  

Output:

Traceback (most recent call last):     File "source_file.py", line 14, in       item = next(number)  StopIteration   256  32  82

Python next() Function Example 3

  # Python next() function example  number = iter([256, “tutoraspire”, 82,]) # Creating iterator  # Calling function  item = next(number)   # Displaying result  print(item)  # second item  item = next(number)  print(item)  # third item  item = next(number)  print(item)  # fourth item  item = next(number, “No item is present”) # error, no item is present  print(item)  

Output:

256 TutorAspire 82  No item is present

Python next() Function Example 4

Here, we are setting a default value. Now, it does not throw any error instead it returns the default value.

  # Python next() function example  number = iter([256, “tutoraspire”, 82,]) # Creating iterator  # Calling function  item = next(number)   # Displaying result  print(item)  # second item  item = next(number)  print(item)  # third item  item = next(number)  print(item)  # fourth item  item = next(number, “No item is left”) # no error due to default value  print(item)  

Output:

256 TutorAspire 82  No item is left

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Python next() function with Examples

Python next() Function

Signature

Parameters

Return

Python next() Function Example 1

Python next() Function Example 2

Python next() Function Example 3

Python next() Function Example 4

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