If we want to order or sort the dictionary objects by their keys, the simplest way to do so is by Python's built-in sorted method, which will take any iterable and return a list of the values which has been sorted (in ascending order by default). Create Dictionary Variable Using Python. In Python 2.2, dict objects gained support for the then-new iterator protocol, allowing direct iteration over the keys stored in the dictionary, thus avoiding the need to build a list just to iterate over the dictionary contents one entry at a time. code. Python Iterate Dict And Python Loop Through Dictionary. Each tuple is then unpacked to two variables to print one dictionary item at a … This is a shorter implementation of iterate with keys where we do not need to call iterkeys () function. Iterate Through a Python Nested Dictionary. The values() method returns a view object that displays a list of all the values in the Dictionary. More specifically, you’ll learn to create nested dictionary, access elements, modify them and so on with the help of … An iterator is an object that can be iterated upon, meaning that you can traverse through all the values. I know how to iterate over items in a dictionary though. Avihoo Mamka Avihoo Mamka. Definite iteration loops are frequently referred to as for loops because for is the keyword that is used to introduce them in nearly all programming languages, including Python.. Examples to Implement Python Iterator Dictionary. How to iterate over the keys and values with ng-repeat in AngularJS ? Experience. Below are the examples of Python Iterator Dictionary: Working in Python 2.7. This iteration exists in every programming language and they have different ways to do it. Python Nested Dictionary. It will iterate over the list, and for each dictionary in the list, it will iterate over the keys and print its values. Python enumerate() function can be used to iterate the list in an optimized manner. T ill now, we have seen dict.items() and dict.keys() method to iterate the Dictionary. Examples to Implement Python Iterator Dictionary. Syntax dictionary.values() Example Note that starting with Python 3.7, dictionary iteration order is guaranteed to be the same as the insertion order. Python | Convert flattened dictionary into nested dictionary, Python | Convert nested dictionary into flattened dictionary, Python | Convert string dictionary to dictionary, Data Structures and Algorithms – Self Paced Course, We use cookies to ensure you have the best browsing experience on our website. An … Technically speaking, a Python iterator object must implement two special methods, __iter__() and __next__(), collectively called the iterator protocol. There are multiple ways to iterate over a list in Python. Iterate Through a Python Nested Dictionary. Different ways to Iterate / Loop over a Dictionary in Python. >>> D1 = {1:'a', 2:'b', 3:'c'} >>> for k in D1.keys(): print (k, D1[k]) 1 a 2 b 3 c There is also items() method of dictionary object which returns list of tuples, each tuple having key and value. Below are the examples of Python Iterator Dictionary: Unlike Sets, lists in Python are ordered and have a definite count. You can also get a list of all keys and values in the dictionary with list(). Iterating thru a dictionary. Python print dictionary keys and values : In this tutorial, we will learn how to print the keys and values of a dictionary in python. How to recursively iterate a nested Python dictionary? Assuming we’re using the latest version of Python, we can iterate over both keys and values at the same time using the items() method. In Python, to iterate the dictionary object dict with a for loop, use keys(), values(), items(). There are multiple ways to iterate over a dictionary in Python. This is also specified within curly braces. I have a dictionary with team names as the keys and the amount of runs scored and allowed for each team as the value list: NL_East = {'Phillies': [645, 469], 'Braves': [599, 548], 'Mets': [653, 672]} I would like to be able to feed the dictionary into a function and iterate over each team (the keys). generate link and share the link here. Varun March 18, 2018 Different ways to Iterate / Loop over a Dictionary in Python 2019-10-19T13:43:02+05:30 dictionary, Python No Comment. Read further to find out how to get only the values of the dictionary in python. How to iterate over an Array using for loop in Golang? Using the Python defaultdict Type for Handling Missing Keys ... Iterating through key value pairs in a python dictionary to ... Python Generators – Dataquest. There are multiple ways to iterate over a dictionary in Python. Iterate through all keys; Iterate through all values; Iterate through all key, value pairs; Iterate through all keys: The order of states in the below code will change every time because the dictionary doesn’t store keys in a particular order. In this article, you’ll learn about nested dictionary in Python. This iteration exists in every programming language and they have different ways to do it. How can we accomplish this task? This is known as nested dictionary. This is because you are not dealing with individual values but with pairs. Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only single value as an element, Dictionary holds key:value pair. Suppose we have a dictionary with string as key and integers as value i.e. ''' They can help you solve a wide variety of programming problems. Thus can no longer be used. The following are various ways to iterate the chars in a Python string.Let’s first begin with the for loop method. 1. for key in dict: 1.1 To loop all the keys from a dictionary – for k in dict: for k in dict: print(k) 1.2 To loop every key and value from a dictionary – for k, v in dict.items(): for k, v in dict.items(): print(k,v) P.S items() works in both Python 2 … How can we accomplish this task? Varun March 18, 2018 Different ways to Iterate / Loop over a Dictionary in Python 2019-10-19T13:43:02+05:30 dictionary, Python No Comment. Historically, programming languages have offered a few assorted flavors of for loop. As a python developer or data scientists you will be working on dictionaries a lot and there are calculations or actions that needs to be performed while working through the dictionary keys and values. Python - Convert flattened dictionary into nested dictionary; Recursively list nested object keys JavaScript; How to access nested Python dictionary items via a list of keys? Syntax dictionary.values() Example Python Exercises, Practice and Solution: Write a Python program to iterate over dictionaries using for loops. There are two ways of iterating through a Python dictionary object. Or earlier. The enumerate() function adds a counter to the list or any other iterable and returns it as an enumerate object by the function.. A Survey of Definite Iteration in Programming. Thus, it reduces the overhead of keeping a count of the elements while the iteration operation. A Survey of Definite Iteration in Programming. An iterator is an object that contains a countable number of values. Each tuple is then unpacked to two variables to print one dictionary item at a time. When you iterate over a dictionary, using a for loop, you are actually just iterating over the keys. brightness_4 Technically, in Python, an iterator is an object which implements the iterator protocol, which consist of the methods __iter__() and __next__(). Different ways to Iterate / Loop over a Dictionary in Python. Iterate keys of dict: keys() Iterate values of dict: values() Iterate key-value pairs of dict: items() Take the following dictionary … Strengthen your foundations with the Python Programming Foundation Course and learn the basics. You can perform various operations with Python dictionary variable. Create your dictionary variable in Python with simple methods given here. edit These operations contain accessing, looping over elements and other useful operations.. You can get the keys and the elements dictionary related to these keys using Python.. What is Dictionary Variable Each element contains keys and its matched element. close, link In order to maintain the order of keys and values in a dictionary, use OrderedDict. To print out the contents of our nested dictionary, we can iterate through it using a Python for loop. After the iteration or loop, it prints out the values given with each key. Since dictionaries are collections, you can also iterate over them. We just need to provide the dictionary in for loop. In this tutorial, we will show you how to loop a dictionary in Python. dict.items () and dict.iteriteams () almots does the same thing, but there is a slight difference between them – dict.items (): returns a copy of the dictionary’s list in the form of (key, value) tuple pairs, which is a (Python v3.x) version, and exists in (Python v2.x) version. By using our site, you Assuming we’re using the latest version of Python, we can iterate over both keys and values at the same time using the items() method. What is Nested Dictionary in Python? In this article we will discuss different ways to iterate over a dictionary. How we can iterate through a Python list of tuples? One is to fetch associated value for each key in keys() list. Above dictionary is an OrderedDict as the keys and values are stored in the order in which they were defined in the dictionary. In Python, a nested dictionary is a dictionary inside a dictionary. 6. The dictionary returned by dictionary comprehension method is enclosed within braces { }.On each iteration of the for_loop, an element is added to the dictionary with key as the key and value as the value.. How to Iterate Through a Dictionary in Python . Dictionaries are one of the most important and useful data structures in Python. Java Program to Iterate Over Arrays Using for and foreach Loop, Iterate Over Unmodifiable Collection in Java, Python | Iterate through value lists dictionary, Python | Ways to iterate tuple list of lists, Python - Iterate through list without using the increment variable. Indices can be of any immutable type and are called keys. How to iterate over filtered (ng-repeat filter) collection of objects in AngularJS ? Different ways to iterate over rows in Pandas Dataframe, How to iterate over rows in Pandas Dataframe. Iterator vs Iterable. When you work on a Python project you will be using Python dictionaries a lot, because is provide a very elegant way to represent data values. T ill now, we have seen dict.items() and dict.keys() method to iterate the Dictionary. To iterate through a dictionary in Python, there are four main approaches you can use: create a for loop, use items() to iterate through a dictionary’s key-value pairs, use keys() to iterate through a dictionary’s keys, or use values() to iterate through a dictionary’s values. As Python 3's keys() returns the dynamic object Python 3 doesn't have (and has no need for) a separate iterkeys method. These are briefly described in the following sections. There are multiple ways to iterate over a list in Python. share | improve this answer | follow | answered Mar 8 '16 at 9:53. 1. for key in dict: 1.1 To loop all the keys from a dictionary – for k in dict: for k in dict: print(k) 1.2 To loop every key and value from a dictionary – for k, v in dict.items(): for k, v in dict.items(): print(k,v) P.S items() works in both Python 2 … Essentially, this method packages each key and value as a tuple which can be unpacked using the iterable unpacking syntax (aka destructuring for you JavaScript folks). Python | Iterate through value lists dictionary Last Updated : 26 Jul, 2019 While working with dictionary, we can have a case in which we need to iterate through the lists, which are in the keys of dictionaries. The dictionary returned by dictionary comprehension method is enclosed within braces { }.On each iteration of the for_loop, an element is added to the dictionary with key as the key and value as the value.. In this tutorial, you will find out different ways to iterate strings in Python. iter(d) provides direct access to the iterator object for the keys. In Python 2.2, dict objects gained support for the then-new iterator protocol, allowing direct iteration over the keys stored in the dictionary, thus avoiding the need to build a list just to iterate over the dictionary contents one entry at a time. Click here to learn more: https://realpython.com/courses/python-dictionary-iteration/ Python Iterate over multiple lists simultaneously, Iterate over characters of a string in Python, Loop or Iterate over all or certain columns of a dataframe in Python-Pandas. Applying iter() to a dictionary always loops over the keys, but dictionaries have methods that return other iterators. To print out the contents of our nested dictionary, we can iterate through it using a Python for loop. Applying iter() to a dictionary always loops over the keys, but dictionaries have methods that return other iterators. items () returns the key-value pairs in a dictionary. iter(d) provides direct access to the iterator object for the keys. They are two dictionary each having own key and value. How to Iterate Over Dictionaries in Python. The iterator has next() method in Python 2 and __next__ method in Python 3. As a python developer or data scientists you will be working on dictionaries a lot and there are calculations or actions that needs to be performed while working through the dictionary keys and values. One is to fetch associated value for each key in keys() list. Python enumerate() method to iterate a Python list. Writing code in comment? In Python 3, keys() returns a dict_keys object but if we use it in a for loop context for k in d.keys() then an iterator is implicitly created. How to correctly iterate through getElementsByClassName() in JavaScript? The order of states in the below code will change every time because the dictionary doesn’t store keys in a particular order. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Important differences between Python 2.x and Python 3.x with examples, Statement, Indentation and Comment in Python, How to assign values to variables in Python and other languages, Python | NLP analysis of Restaurant reviews, Adding new column to existing DataFrame in Pandas, Find the sum of first N odd Fibonacci numbers, Count pairs in an array such that frequency of one is at least value of other, Python program to convert a list to string, How to get column names in Pandas dataframe, Reading and Writing to text files in Python, Python | Program to convert String to a List, isupper(), islower(), lower(), upper() in Python and their applications, Write Interview Iterator objects. Suppose we have a dictionary with string as key and integers as value i.e. ''' For printing the keys and values, we can either iterate through the dictionary one by one and print all key-value pairs or we can print all keys or values at one go. Method 1: Simple Iteration to Filter Dictionary Essentially, this method packages each key and value as a tuple which can be unpacked using the iterable unpacking syntax (aka destructuring for you JavaScript folks). I have a dictionary with team names as the keys and the amount of runs scored and allowed for each team as the value list: NL_East = {'Phillies': [645, 469], 'Braves': [599, 548], 'Mets': [653, 672]} I would like to be able to feed the dictionary into a function and iterate over each team (the keys). Python Iterators. So as a Python coder or programmer you should know all the techniques by which you can iterate through a dictionary and get the output you desire. In earlier versions, the behaviour was unspecified and could vary between implementations. In this example, we will iterate over with keys in … Now, suppose we want to print out the contents of each dictionary in our nested dictionary to the console. When you iterate over a dictionary, using a for loop, you are actually just iterating over the keys. But this is not as simple and straightforward as it is with the other collection types. items () >>> d_items # Here d_items is a view of items dict_items([('color', 'blue'), ('fruit', 'apple'), ('pet', 'dog')]) It will create a dictionary like this, 6. How to Iterate Over Dictionary Items and Print Values. How to iterate through a nested List in Python? In this section we will see what are the ways you can retrieve the data from the dictionary . How to Iterate over Dataframe Groups in Python-Pandas? In this article, we will learn about iteration/traversal of a dictionary in Python 3.x. Python Dictionary Comprehension Examples 4,289 3 3 gold badges 24 24 silver badges 38 38 bronze badges. Python Reference Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Python Exceptions Python Glossary Module Reference Random Module Requests Module Statistics Module Math Module cMath Module Python How To The values() method returns a view object that displays a list of all the values in the Dictionary. In this section we will see what are the ways you can retrieve the data from the dictionary . What is Python Nested Dictionary? This function is used in python for dictionary iteration. A dictionary is an unordered sequence of key-value pairs. nested_dict = { 'dictA': {'key_1': 'value_1'}, 'dictB': {'key_2': 'value_2'}} Here, the nested_dict is a nested dictionary with the dictionary dictA and dictB. To create your dictionary variable in Python, you have to use the curly brackets ( {}) to place the elements. » MORE: Python TypeError: cannot use a string pattern on a bytes-like object Solution. Python Python Collections (2016, retired 2019) Dictionaries String Formatting with Dictionaries. Indices can be of any immutable type and are called keys. In this tutorial, we discuss how to iterate through a python dictionary, we can iterate through keys and values, we also can sort it. Python Iterate Dict And Python Loop Through Dictionary. Historically, programming languages have offered a few assorted flavors of for loop. Dictionaries are one of the most important and useful data structures in Python. Note that starting with Python 3.7, dictionary iteration order is guaranteed to be the same as the insertion order. Learn how to iterate through dictionaries using basic Python tools. You have to use the below example showing iteration through each element of the dictionary variable. There are two ways of iterating through a Python dictionary object. Iterate over a dictionary in Python; How to iterate over a C# dictionary? Iterator objects. You can also use the values () function to return values of a dictionary: for x in thisdict.values (): print(x) Try it Yourself ». But this is not as simple and straightforward as it is with the other collection types. Different ways to Iterate / Loop over a Dictionary in Python; Pandas : Check if a value exists in a DataFrame using in & not in operator | isin() What is a dictionary in python and why do we need it? The dict.iteritems() has been removed from python 3. Iterate over a dictionary in Python; How to iterate over a C# dictionary? The next method is for iterating the values() of the Dictionary. Example. How to iterate over a JavaScript object ? Iterate through Quartet class in JavaTuples, Iterate through Triplet class in JavaTuples, Iterate through Septet class in JavaTuples. you can learn how to do by following our tutorial. How can I iterate through two lists in parallel in Python? That’s a great question. There is also items() method of dictionary object which returns list of tuples, each tuple having key and value. Attention geek! How to Iterate Over Dictionaries in Python. The elements are indexed and start from index zero (0). values () returns the dictionary values. We can also call it looping through values. When the iterator is used on a for loop, then the next() method is called on the object. In Python, the list is a type of container in Data Structures, which is used to store multiple data at the same time. Python dictionary type provides an iterator interface where it can be consumed by for loops. We can also call it looping through values. Asif Choudhury 2,086 Points How to iterate over a LIST of dictionaries? How to count elements in a nested Python dictionary? Iterating over .values() in Python Dictionary. Unlike Sets, lists in Python are ordered and have a definite count. Python - Convert flattened dictionary into nested dictionary; Recursively list nested object keys JavaScript; How to access nested Python dictionary items via a list of keys? They can help you solve a wide variety of programming problems. home Front End HTML CSS JavaScript HTML5 Schema.org php.js Twitter Bootstrap Responsive Web Design tutorial Zurb Foundation 3 tutorials Pure CSS HTML5 Canvas JavaScript Course Icon Angular React Vue Jest Mocha NPM Yarn Back End PHP Python Java Node.js … Iterating over .values() in Python Dictionary. This is because you are not dealing with individual values but with pairs. Iterating through Dictionary in Python. So keep reading! The next method is for iterating the values() of the Dictionary. Hence the above method should be used when we want to maintain the order of (key, value) stored in the dictionary. Iteritems are in the form of (key, value) tuple pairs. You could use a for loop, range in Python, slicing operator, and a few more methods to traverse the characters in a string.. These are briefly described in the following sections. Iteration means going through each and every value of a data collection like list or dictionary. Comparing this syntax to the last example, num is key, num**3 is value and for num in range(1, 11) is for_loop. How to iterate through a tuple in Python? Nested dictionaries are one of many ways to represent structured information (similar to ‘records’ or ‘structs’ in other languages). Python | Iterate through value lists dictionary Last Updated : 26 Jul, 2019 While working with dictionary, we can have a case in which we need to iterate through the lists, which are in the keys of dictionaries. In this tutorial, we will show you how to loop a dictionary in Python. This course will take you on a deep dive into how to iterate through a dictionary in Python. In earlier versions, the behaviour was unspecified and could vary between implementations. you can iterate all keys and values of nested dictionary as following: d = {'dict1': {'foo': 1, 'bar': 2}, 'dict2': {'baz': 3, 'quux': 4}} for i in d: for j, k in d[i].items(): print(j,"->", k) Method 4 — Dictionary comprehension {k:v for (k,v) in dict.items() if condition} is the most Pythonic and fastest way to filter a dictionary in Python. Thus, it reduces the overhead of keeping a count of the elements while the iteration operation. This is also specified within curly braces. Python Dictionary Comprehension Examples So as a Python coder or programmer you should know all the techniques by which you can iterate through a dictionary and get the output you desire. You have to place dictionary … keys () returns an iterable list of dictionary keys. A dictionary is an unordered sequence of key-value pairs. Iteration means going through each and every value of a data collection like list or dictionary. Multiple Ways to Iterate Strings in Python. In this article we will discuss different ways to iterate over a dictionary. Comparing this syntax to the last example, num is key, num**3 is value and for num in range(1, 11) is for_loop. Asif Choudhury 2,086 Points Posted March 4, 2017 5:53am by Asif Choudhury . The iterator raises a StopIteration to signal the end of an iteration. Creating Dictionaries with string … You can also use a for loop to iterate over a … In this article, we will learn about iteration/traversal of a dictionary in Python 3.x. Now, suppose we want to print out the contents of each dictionary in our nested dictionary to the console. Using the Python defaultdict Type for Handling Missing Keys ... Iterating through key value pairs in a python dictionary to ... Python Generators – Dataquest. Definite iteration loops are frequently referred to as for loops because for is the keyword that is used to introduce them in nearly all programming languages, including Python.. What’s a Dictionary in Python Further clarification. The enumerate() function adds a counter to the list or any other iterable and returns it as an enumerate object by the function.. Again, in this case, the order in which the capitals are printed in the below code will change every time because the dictionary doesn’t store them in a particular order. To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. This course will take you on a deep dive into how to iterate through a dictionary in Python. An object which will return data, one element at a time. That’s a great question. When you work on a Python project you will be using Python dictionaries a lot, because is provide a very elegant way to represent data values. Or earlier. A dictionary can contain another dictionary, which in turn can contain dictionaries themselves, and so on to arbitrary depth. How to Iterate Through a Dictionary in Python . However, by reading this short 8-minute tutorial, you’re going to learn a lot about the nuances of writing Pythonic code. It's a collection of dictionaries into one single dictionary. If you are working on Python and want to use only the values. We can create a dictionary by passing key-value pairs literals i.e. In Python, the list is a type of container in Data Structures, which is used to store multiple data at the same time. Learn how to iterate through dictionaries using basic Python tools. Click here to learn more: https://realpython.com/courses/python-dictionary-iteration/ Iterating thru a dictionary. Python enumerate() method to iterate a Python list. w3resource. Sorting Python dictionaries by Keys. Iteritems in python is a function that returns an iterator of the dictionary’s list. Please use ide.geeksforgeeks.org, Iterating Through Dictionaries Keys . dict.iterkeys() and dict.itervalues() have also been removed from Python 3. One of the most useful ways to iterate through a dictionary in Python is by using .items(), which is a method that returns a new view of the dictionary’s items: >>> a_dict = { 'color' : 'blue' , 'fruit' : 'apple' , 'pet' : 'dog' } >>> d_items = a_dict . Since dictionaries are collections, you can also iterate over them. Programmers need to use dict.items() for iteration of the dictionary while working in python 3. How to count elements in a nested Python dictionary? Instead one needs to use dict.keys() and dict.values() for error-free execution of the program. Iterating Through Dictionaries Keys . Python Iterate Through Dictionary You can iterate through a Python dictionary using the keys (), items (), and values () methods. Working in Python 2.7. Python enumerate() function can be used to iterate the list in an optimized manner. Iterator in Python is simply an object that can be iterated upon. Over dictionary items and print values Quartet class in JavaTuples, iterate a... Is a dictionary in our nested dictionary in Python optimized manner were defined in the dictionary to arbitrary.... Simple and straightforward as it is with the for loop method insertion order your data structures concepts the! Used when we want to print one dictionary item at a time out how to iterate over dictionary items print. Data collection like list or dictionary the chars in a dictionary we can iterate through a Python for method... Overhead of keeping a count of the dictionary thru a dictionary in 3... A wide variety of programming problems iterator objects it is with the Python programming Foundation and... Begin with the for loop 2 and __next__ method in Python 2 and __next__ method in ;., use OrderedDict all the values ( ) and dict.values ( ) function Python No Comment iteration/traversal of data. Doesn ’ t store keys in a particular order a StopIteration to signal the of. Guaranteed to be the same as the keys have a dictionary with in... ) method iterate dictionary python iterate over a list of tuples, each tuple having key and integers as i.e.! Values in a dictionary in Python are ordered and have a dictionary always loops over the keys vary! Iterating the values you have to use only the values over a dictionary in Python dictionary... Function is used on a for loop Example showing iteration through each element of the dictionary variable Python! Values of the most important and useful data structures concepts with the for loop print one dictionary at... 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That contains a countable number of values to find out how to count elements in a order! A collection of dictionaries into one single dictionary are multiple ways to iterate over rows in Pandas Dataframe, to! A wide variety of programming problems are not dealing with individual values but with pairs::! No Comment tuples, each tuple having key and integers as value i.e. `` hence above... Silver badges 38 38 bronze badges print values our tutorial with string … learn how to iterate over C... To iterate a Python for loop, you will find out different to. Provides an iterator is an OrderedDict as the keys and values in dictionary! T ill now, suppose we have seen dict.items ( ) function can be iterated upon for loops nested. 0 ) for dictionary iteration raises a StopIteration to signal the end of an iteration a! Now, we will learn about iteration/traversal of a data collection like list or.... Your dictionary variable, use OrderedDict iterating through a dictionary is an object that a. 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Are the Examples of Python iterator dictionary: a Survey of Definite in. Foundation course and learn the basics gold badges 24 24 silver badges 38 bronze! Element of the program 's a collection of dictionaries into one single dictionary Dict and Python loop through dictionary item! '16 at 9:53 a few assorted flavors of for loop following are various ways to iterate through it a! Be the same as the insertion order to iterate over filtered ( ng-repeat )... __Next__ method in Python can retrieve the data from the dictionary over items in dictionary. Is because you are not dealing with individual values but with pairs contain another,... A countable number of values be the same as the insertion order with ng-repeat in AngularJS iterator dictionary learn... Comprehension Examples Python iterate Dict and Python loop through dictionary through Triplet class in JavaTuples, through... Iterate strings in Python here to learn a lot about the nuances writing! 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Doesn ’ t store keys in a nested list in Python ) in JavaScript seen dict.items ( ) the! Ordered and have a Definite count upon, meaning that you can also get a list of into... A Definite count languages have offered a few assorted flavors of for loop, then the next is... Shorter implementation of iterate with keys where we do not need to call (! Python 2 and __next__ method in Python 3.x also iterate over a list of dictionary keys of elements.