Python next(): How to Use next() Function In Python

Python next() is an inbuilt function that returns the next item from an  iterator. The next() function is used to fetch the 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.

Python next()

Python next() method returns the next element from the list, if not present prints the default value. If the default value is not present, raise the StopIteration error. You can add a default return value, to return if the iterable has reached its end.

Syntax:

next (iterator[, default]) 

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.

Python next() Function Example

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

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 #python next