The next () function in Python

Continuing with the topic of built-in functions in Python, the article will introduce you to the next () function with syntax, usage as well as specific examples. Invites you to read the track.

The next () function in Python returns the next element in the iterator. You can add a default value to return if iterable is already the last element.

The syntax of the next () function in Python:

 next(iterator, default)

Parameters of the next () function

The next () function has 2 parameters:

iterator : iterable object.
default : the default value will be returned if iterable is the last element.

Return value from next ()

The next () function returns the next element in the iterator
If the iterator runs out, the function returns the default value
If the iterator expires without a default value, the StopIteration exception will be raised.

Example 1: how does next () work?

 random = [5, 9, 'cat'] # chuyển list thành iterator randomIterator = iter(random) print(randomIterator) # Output: 5 print(next(randomIterator)) # Output: 9 print(next(randomIterator)) # Output: 'cat' print(next(randomIterator)) # Xảy ra lỗi # iterator hết print(next(randomIterator))

When you run the program, the output will be:

  5 9 cat Traceback (most recent call last): File "python", line 18, in StopIteration

In the above code, the list is an iterable object, and you can get the iterator from there using the built-in function iter () in Python.

Example 2: Iterator has the default value in next ()

 random = [5, 9] # chuyển list thành iterator randomIterator = iter(random) # Output: 5 print(next(randomIterator, '-1')) # Output: 9 print(next(randomIterator, '-1')) # randomIterator đã hết phần tử # Output: '-1' print(next(randomIterator, '-1')) print(next(randomIterator, '-1')) print(next(randomIterator, '-1'))

Return value:

 5 9 -1 -1 -1

You should read it

May be interested

Help () function in Python
the built-in help () function in python is used to display documents and invoke the help system of modules, functions, classes, keywords ...
Sum () function in Python
the built-in function sum () in python returns the sum of all numbers in iterable.
The slice () function in Python
the slice () function in python returns a slice object that helps you determine how to cut an existing string.
The chr () function in Python
in python, the chr () function returns a character (a string) from an integer that represents the unicode of the returned character.
The iter () function in Python
continuing with the topic of python's built-in functions, the article will introduce you to the iter () function with the syntax, usage as well as specific examples. invites you to read the track.
The pow () function in Python
the pow () function built into python returns the value of x with the power of y (xy). if there is a third parameter, the function returns x to the power y, the module z.
The reversed () function in Python
the reversed () function is one of the built-in functions in python, used to reverse the original string returning the iterator.
Built-in Python functions
in the previous article, you learned that python has a basic function type, one is a built-in function, two are user-defined functions. today, we will learn about a list of python's built-in functions.
Exec () function in Python
the exec () function used to execute python programs dynamically can be string or object code. how does exec () function syntax, what parameters do it have, and how is it used? invites you to read the track.
The compile () function in Python
the compile () function returns a code object in python from the specified source. so how to use compile () function? please find out in this article.