Skip to main content

Iterator in Python


Python Iterators

Iterators are objects to be iterated onto. You'll learn what iterators are in it during this python tutorial, and also how to apply a Python iterator. We'll also explore how iter and the next methods can be used to build our own Iterators.

iterator-in-python.jpg

What are the iterators in Python? 

Iterators are all over Python. Iterators are artifacts in python that is widely used to iterate over a set of values, elegantly implemented within them for loops, understandings, generators, etc., but concealed in plain sight.
It is only an entity iterated upon. An object capable of returning data, one item at a time.
Technically speaking, the Python iterator object has to follow two special methods, iter () and next (), named the iterator protocol, collectively.

1. __iter__ method.

This is called upon to create an iterator. It will return an object with a next step, or next.

2.  Next method 

The next method by the iterator returns the following value for the iterable. 
If using an iterator with a ' for in ' loop, next() on the iterator object is implicitly named by the loop. To mark the end of the iteration, this method will use a StopIteration.

How to Apply Python Iterators

Iter() method

All of these things, lists, tuples, dictionaries have a method iter() that can be used to have an iterator:

Example:

Run an iterator, and print every value

x = iter(["apple", "banana", "cherry"])
print(next(x))
print(next(x))
print(next(x))

Output 
apple
banana
cherry 

2 Next() Method

Example:
  mylist = iter(["apple", "banana", "cherry"])
  x = next(mylist)
  print(x)
  x = next(mylist)
  print(x)
  x = next(mylist)
  print(x) 
Output
apple
banana
cherry
  
Iterate over a dictionary in Python

Python dictionary is an unsorted set of information values that generally store data values like a map that, unlike many other data types that only hold a single value as a part, Dictionary holds the key: value pair.

In this, there are several ways to iterate over a dictionary.

     Iterate by all keys
     Iterate by any value
     Iterate all the key, value pairs

Read More...
Also, Visit Here  Python Tutorial for Beginners

Comments

Post a Comment

Popular posts from this blog

Python Tutorial for Beginners

Learn Python with Industrial Experts with Examples Python is a popular general-purpose high-level, interactive and object-oriented scripting language that was invented by Guido Rossum in 1990. Python programming is commonly used in Computing Science in Artificial Intelligence, Human language Generation, Neural Networks and other specialized fields. Python for beginners , it has a basic syntax that is easy to use. That makes Python an outstanding language for novice to learn technology. Why Learn Python It is the most common and rapidly growing programming language of the present time. Here are 10 explanations for learning Python:   1.  It is simple and easy to understand  2.  It is very popular and on-demand  3   It has several libraries and frameworks  4.  It is often used in Data science  5.  It is often used in Artificial Intelligence and Machine Learning  6....

SEO Website Audit

SEO Audit How to Perform an SEO Audit of your website? An SEO audit defines as the process of examining the functioning and presence of the site in numerous areas. With the help of this, one can find basic issues of the websites that require improvement as well as prevent the websites from the scams. In addition to it, it also keeps your websites updated with updates related to the rankings that are upgraded by Google. Apart from it, you can also take help from SEO tutorials.  Areas covered by an SEO audit:   An audit covers numerous areas. Here is the list of some significant areas. ●   Ensure you about Problematic codes - It gives the information about the reason that causes your website ranking down or slows it down. You can either hire the web developer or take guidance from SEO tutorial to resolve this problem ●  Keywords - It shows you the usage of keywords is well placed, on a point or not. Crawling audit - It commences with cra...

Best Way To Learn SEO

Learn SEO Before learning the subject, let’s understand something about it. Search engine optimization (SEO) is basically a process of improving the positions in the organic (non-paid) search results in the search engines. Please note that the higher the website is, the more people will be able to see it. The history of the SEO go back to the 90s when there were search engines emerged as for the first time. Nowadays, it is an essential marketing strategy and also an ever-growing industry.  Even the basic can change can usually make a very big difference in the terms that how search engines will see your website. In order to learn SEO , one should learn the basics of it from an SEO guide for beginners that is available on the web generally with all the points that cover all the critical topics and the basics.   The good thing about learning is that you’ll find basically tons of the information on the internet for free but the user should be able to ...