In Python, a nested dictionary is a dictionary inside a dictionary. As we can see, only the items with even value have been added, because of the if clause in the dictionary comprehension. Similarly, you can use lower( ) function for transforming string to lowercase. Since in a comprehension, the first thing we specify is the value to put in a list, this is where we put our if-else. We can directly use the ‘in operator’ with the dictionary to check if a key exist in dictionary or nor. List Comprehension is a handy and faster way to create lists in Python in just a single line of code. Python Tutorial for Beginners: Learn Python Programming in 7 Days How to use lambda function in list and dictionary comprehension in Python – Quora Python List Comprehension and Slicing List comprehension is an elegant way to define and create lists based on existing lists Python allows us to create dictionary comprehensions. The keys must be unique and immutable. upper( ) converts string to uppercase. Without list comprehension you will have to write a … During this transformation, items within the original dictionary can be conditionally included in the new dictionary and each item can be transformed as needed. With dict comprehension or dictionary comprehension, one can easily create dictionaries. Consider the following code: square_dict = dict() for num in range(1, 11): square_dict[num] = num*num print(square_dict) Now, let's create the dictionary in the above program using dictionary comprehension. Comparing this syntax to the last example, num is key, num**3 is value and for num in range(1, 11) is for_loop. Performance & security by Cloudflare, Please complete the security check to access. You may need to download version 2.0 now from the Chrome Web Store. Here’s a simple list comprehension that uses string as an iterable. On top of … A dictionary comprehension allows you to run a for loop on a dictionary and do something on each item like transforming or filtering, and returns a new dictionary. Therefore it is up to your discretion to take home the knowledge imparted by this article. Nested Dictionary Comprehensions lack readability and therefore should be avoided in Python. The context loops over an iterable using a single-line for loop and defines which (key,value) pairs to include in … List comprehension offers a shorter syntax when you want to create a new list based on the values of an existing list. Python Dictionary Comprehensions become even more powerful when we add conditions to them, such as if and if-else statements. A dictionary can be considered as a list with special index. Cloudflare Ray ID: 60ebaf13084ee0c6 Get code examples like "list comprehension python if else" instantly right from your google search results with the Grepper Chrome Extension. Are you interested in learning how to code using Python? Whenever nested dictionary comprehension is used, Python first starts from the outer loop and then goes to the inner one. Create a dictionary with list comprehension in Python. Dictionary comprehension is an elegant and concise way to create dictionaries. In Python, dictionary is a data structure to store data such that each element of the stored data is associated with a key. Comprehension is considered more Pythonic and often useful in a variety of scenarios. With comprehensions, you can combine loops and conditional tests with a less verbose syntax. What is Dictionary Comprehension in Python? Example: Based on a list of fruits, you want a new list, containing only the fruits with the letter "a" in the name. Nested Dictionary Comprehension. Python Dictionary Comprehension Examples Comprehension is considered more Pythonic and often useful in a variety of scenarios. Otherwise, convert text to lowercase. They require a mind shift. Skip to content. The concept of comprehension in Python is that it is an easier and more readable way to create a list or other sequence. Basic Python Dictionary Comprehension. Python Dictionary Comprehension If Else Condition Example: In the same example if the person’s age is bigger or equal to 18, our program will add it as ” can vote ” otherwise “ cannot vote “. Just use a normal for-loop: data = for a in data: if E.g. List comprehension offers a shorter syntax when you want to create a new list based on the values of an existing list. If you’re interested in learning about dictionary comprehensions, read our guide to Python dictionary comprehension. Python Dictionary Comprehension, Learn how dictionary comprehension works in Python from scratch. So, when we call my_dict['a'], it must output the corresponding ascii value (97).Let’s do this for the letters a-z. So, in order to check whether a particular key is present in the dict, we use Python if statement along with the keys() method to compare the search_key with the list of keys returned from the keys() method. An else statement contains the block of code that executes if the conditional expression in the if statement resolves to 0 or a FALSE value.. The keys must be unique and immutable. asked Sep 17, 2019 in Python by Sammy (47.8k points) python; ... +1 vote. Your IP: 72.27.230.19 Python dictionary comprehension if else. List comprehension sounds complex but it really isn’t. Comprehensions¶ History: where did they come from? This syntax was introduced in Python 3 and backported as far as Python 2.7, so you should be able to use it regardless of which version of Python you have installed. Tagged with python. Here, dictionary has a key:value pair enclosed within curly brackets {}. While the values can be of any data type and can repeat, keys must be of immutable type (string, number or tuple with immutable elements) and must be unique. To learn more about dictionary, please visit Python Dictionary. 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 It consists of two parts: expression and context. This is a beginner friendly post for those who know how to write for-loops in python but don’t quite understand how list comprehensions work, yet. This Video covers if elif, while loops, for loops, finally statements list,dictionary, set ,generator comprehensions in python. Creating a dictionary is as simple as placing items inside curly braces {} separated by commas.. An item has a key and a corresponding value that is expressed as a pair (key: value).. The items with a value of 40 or more have the value of 'old' while others have the value of 'young'. Comprehensions¶ History: where did they come from? It is because of the multiple if clauses in the dictionary comprehension. A dictionary comprehension takes the form {key: value for (key, value) in iterable}. In this case, a new dictionary is created via dictionary comprehension. Python Dictionary Comprehensions become even more powerful when we add conditions to them, such as if and if-else statements. We can use an “if-else” in a list comprehension in Python. It helps us write easy to read for loops in a single line. Python update dictionary in list comprehension. This tutorial includes various examples which would help you to practice the concept of dictionary comprehension and how it is used in real-world scenarios List Comprehension : IF-ELSE Here we are telling python to convert text of each item of list to uppercase letters if length of string is greater than 4. The expression defines how to map keys to values. Dictionaries are data types in Python which allows us to store data in key/value pair. dict.keys() The keys() method takes no arguments and returns an object that represents a list of all the keys present in a particular input dictionary.. Dictionary Comprehension in Python is a great way to reduce the size of the program, but it may be lead to confusion during code-review. And, for list comprehensions with if conditions only, [f(x) for x in sequence if condition] Note that this actually uses a different language construct, a conditional expression, which itself is not part of the comprehension syntax, while the if after the for…in is part of list comprehensions and used to filter elements from the source iterable. We need to specify what the output is first, following “if” condition and then “else” followed by what is the output under “else.” >>> ["Even" if i%2==0 else "Odd" for i in range(8)] A comprehension is a compact way of creating a Python data structure from iterators. List comprehensions are actually one of my favorite features in Python. using sequences which have been already defined. Using dictionary comprehension in our code can shorten the lines of code while keeping the logic intact. 1 answer. Note that making a dictionary like that only works for Python 3.x. Note that since Python 3.7, when you loop through a dictionary, you’ll get the key-value pairs in the same order that you insert them. Now, let's see how we can use dictionary comprehension using data from another dictionary. In each iteration of for_loop, if condition is True, then expression1 is evaluated and added to the list, else expression2 is evaluated and added to the list. It's simpler than using for loop.5. Python Dictionary Comprehension. Download the free Career Karma app today to unlock top Python learning resources, and to learn more about training programs for Python developers. It's simpler than using for loop.5. For example, let’s assume that we want to build a dictionary of {key: value} pairs that maps english alphabetical characters to their ascii value.. Example 1: Dictionary Comprehension. asked May 28, 2019 in Python by saptami (130 points) python; dictionary; list-comprehension; 0 votes. Example 1. use python list comprehension to update dictionary value, Assignments are statements, and statements are not usable inside list comprehensions. I've watched every Hettinger talk, and I've taken his online course. Data Structures - List Comprehensions — Python 3.9.0 documentation 6. Like List Comprehension, Python allows dictionary comprehensions. They require a mind shift. Dict comprehensions can use complex expressions and IF-ELSE constructs too. We make a dict from zip result: Creating a list is the most common application of comprehension, but it can also be used with a dictionary, tuple, set, or even a string. The concept of comprehension in Python is that it is an easier and more readable way to create a list or other sequence. Python Dictionary Comprehension Tutorial, Learn all about Python dictionary comprehension: how you can use it to create What you now deal with is a "key-value" pair, which is sometimes a into dictionary comprehensions: you will work with if conditions, multiple if While working with Python dictionaries, we can have utility in which we require to remove more than one keys at once. A dictionary comprehension takes the form {key: value for (key, value) in iterable}. Python supports the following 4 types of comprehensions: We can add dictionary comprehensions to dictionary comprehensions themselves to create nested dictionaries. Ltd. All rights reserved. If no index is specifie a. It makes the code more pythonic. Generator Expressions vs. So far, we were discussing list comprehensions in Python but now we can see similar comprehension techniques in the dictionary, sets, and generators. Basic Python Dictionary Comprehension. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. A comprehension is a compact way of creating a Python data structure from iterators. Python’s list comprehension is a very useful asset for a programmer and a reason for us to love Python. So, the above code would be equivalent to: All these three programs give us the same output. Join our newsletter for the latest updates. Python Tutorial for Beginners: Learn Python Programming in 7 Days How to use lambda function in list and dictionary comprehension in Python – Quora Python List Comprehension and Slicing List comprehension is an elegant way to define and create lists based on existing lists Note that making a dictionary like that only works for Python 3.x. They are equivalent to and operation where both conditions have to be true. We can further customize dictionary comprehension by adding conditions to it. 3) if..else in List Comprehension. Another way to prevent getting this page in the future is to use Privacy Pass. Python in operator along with if statement can be used to check whether a particular key exists in the input Python dictionary.. Python in operator basically checks if a particular element or value is contained in a particular sequence such as list, tuple, dictionary, etc. In this tutorial, I am going to talk about Python Dictionary Comprehension. © Parewa Labs Pvt. Without list comprehension you will have to write a … Python if/else list comprehension (generator expression) - Python if else list comprehension (generator expression).py Watch Now. In this case, only the items with an odd value of less than 40 have been added to the new dictionary. Technique 1: ‘in’ operator to Check if Key Exists in a Python Dictionary. From the above example, we can see that dictionary comprehension should be written in a specific pattern. In Python, you can create list using list comprehensions. In addition, dict comprehensions can be used to create dictionaries from arbitrary . Python Dictionary: update() function tutorial & examples; Remove a key from Dictionary in Python | del vs dict.pop() vs comprehension; Python Dictionary: values() function & examples; Pandas : Check if a value exists in a DataFrame using in & not in operator | isin() Python Dictionary: clear() function & examples An else statement can be combined with an if statement. There is another way of constructing a dictionary via zip that's working for both Python 2.x and 3.x. • So we… Creating a list is the most common application of comprehension, but it can also be used with a dictionary… Unlike a for loop, a dictionary comprehension offers a more expressive and concise syntax when you use it correctly. There is another way of constructing a dictionary via zip that's working for both Python 2.x and 3.x. Learn how dictionary comprehension works in Python from scratch. What makes them so compelling (once you ‘get it’)? Example: Based on a list of fruits, you want a new list, containing only the fruits with the letter "a" in the name. In Python, a dictionary is an unordered collection of items. The output of both programs will be the same. Let's look at an example. So, I'm a Database Admin/Sysadmin and I followed the 6 hour crash course on python from Mosh on youtube in a week.. Now I'm not trying to get a job as a software/web developer, my focus is to automate lot of repetitive tasks I do in my job and improve my skill set as well as resume. Introduction to Python dictionary comprehension. List comprehensions also allow us to use if and else statements, giving them even more specific functionality. What is List Comprehension? Code language: Python (python) Looping through a dictionary. List comprehensions is a pythonic way of expressing a ‘For Loop’ that appends to a list in a single line of code. Data Structures - List Comprehensions — Python 3.9.0 documentation 6. 00:00 In this tutorial, I’m going to talk about list comprehensions. Each entry has a key and value. Using an IF-ELSE construct works slightly differently to what you might expect. The syntax is similar to list comprehensions in Python. We make a dict from zip result: This is pretty awesome, although once again the syntax can be a little tricky. Since in a comprehension, the first thing we specify is the value to put in a list, this is where we put our if-else. In this tutorial, we will learn about Python dictionary comprehension and how to use it with the help of examples. You can also use an if-else in a list comprehension in Python. Now, let's create the dictionary in the above program using dictionary comprehension. In these cases, It is better to choose other alternatives like loops. Dictionary Comprehension is a concise and memory-efficient way to create and initialize dictionaries in one line of Python code. The idea of comprehension is not just unique to lists in Python. This Python tutorial will focus on comprehensions and how to use them. The expression defines how to map keys to values. b. if..else in List Comprehension in Python. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Adding IF Statements to Python Dict Comprehensions If we had a dictionary that included key-value pairs of, for example, people and their age, we could filter the dictionary to only include people older than 25: For example, let’s assume that we want to build a dictionary of {key: value} pairs that maps english alphabetical characters to their ascii value.. Dictionary data structure lets you query the data using key very efficiently. It is an intuitive, easy-to-read and a very convenient way of creating lists. Comprehensions are constructs that allow sequences to be built from other sequences. I know they can seem a little bit arcane at first or a little bit strange, but they are actually super helpful. Dictionary comprehension Dict Comprehensions. Learn Dictionary Comprehension in Python with syntax and examples, invert mapping/reverse lookup, dict comprehension with if else, nested dict comprehension and much more. Dictionaries, one of the commonly used data structures in data science, can also do comprehension. They can help make your programs easier to read and easier to maintain, once you’ve actually wrapped your head around how they work. A dictionary is an unordered collection of key-value pairs. A dictionary is an unordered collection of key-value pairs. Comprehensions are constructs that allow sequences to be built from other sequences. Dictionary comprehension is an elegant and concise way to create dictionaries. Dictionary Comprehension is a concise and memory-efficient way to create and initialize dictionaries in one line of Python code. In Python, you can create list using list comprehensions. >>> ["Even" if i%2==0 else "Odd" for i in range(8)] Comprehensions in Python provide us with a short and concise way to construct new sequences (such as lists, set, dictionary etc.) A dictionary comprehension takes the form {key: value for (key, value) in iterable} Let’s see a example,lets assume we have … Python supports the following 4 types of comprehensions: As you can see, we have constructed a multiplication table in a nested dictionary, for numbers from 2 to 4. Using dictionary comprehension makes this task much simpler and shorter. Warnings on Using Dictionary Comprehension. Let’s see how to use List Comprehension in case of nested loops. They can also decrease the readability of the code. Python 2.0 introduced list comprehensions and Python 3.0 comes with dictionary and set comprehensions. We must not try to fit a difficult logic or a large number of dictionary comprehension inside them just for the sake of making the code single lined. Each entry has a key and value. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. 2 answers. 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.. What makes them so compelling (once you ‘get it’)? Please enable Cookies and reload the page. Conclusion Dictionary Comprehension in Python is a great way to reduce the size of the program, but it may be lead to confusion during code-review. However, using dictionary comprehension allowed us to create a dictionary in a single line. The syntax of the if...else statement is − b. if..else in List Comprehension in Python. They can sometimes make the code run slower and consume more memory. Python: check if key in dictionary using if-in statement. Are there other great Python developers (ideally, core developers) who regularly give interesting talks about Python? Adding IF Statements to Python Dict Comprehensions If we had a dictionary that included key-value pairs of, for example, people and their age, we could filter the dictionary to only include people older than 25: For example: To learn more about them visit: Python Dictionary. List Comprehension. if/else in a list comprehension? To examine a dictionary, you can use a for loop to iterate over its key-value pairs, or keys, or values.. Using List Comprehension with Nested Loops in Python. Comprehensions in Python provide us with a short and concise way to construct new sequences (such as lists, set, dictionary etc.) Even though dictionary comprehensions are great for writing elegant code that is easy to read, they are not always the right choice. This tutorial Like R or SAS, you can create dataframe or dataset using pandas package in python. Note how the order of the for and if statements is the same in both these snippets. ... Raymond Hettinger is great: who else gives great Python talks? We can create dictionaries using simple expressions. It’s a special syntax, creating lists out of lists and transforming many lines of … So, when we call my_dict['a'], it must output the corresponding ascii value (97).Let’s do this for the letters a-z. Below are few examples of list comprehension. This tutorial includes various examples which would help you to practice the concept of dictionary comprehension and how it is used in real-world scenarios This syntax was introduced in Python 3 and backported as far as Python 2.7, so you should be able to use it regardless of which version of Python you have installed. So we… Python Basics Video Course now on Youtube! Creating Python Dictionary. As we can see, dictionary comprehension shortens the process of dictionary initialization by a lot. Python if/else list comprehension (generator expression) - Python if else list comprehension (generator expression).py. List comprehensions can iterate over any type of iterable such as lists, strings, files, ranges, and anything else that supports the iteration protocol. With comprehensions, you can combine loops and conditional tests with a less verbose syntax. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Python 2.0 introduced list comprehensions and Python 3.0 comes with dictionary and set comprehensions. using sequences which have been already defined. A dictionary can be considered as a list with special index. Refer to the code block below, which finds odd and even for a list of numbers. Python Dictionary Comprehension. Let's look at an example. The minimal syntax for dictionary comprehension is: Let's compare this syntax with dictionary comprehension from the above example. Python / By Christian. Here, we can see that we retrieved the item prices in dollars and converted them to pounds. You can apply if-else statement like we do in list comprehension. This Python tutorial will focus on comprehensions and how to use them. • It consists of two parts: expression and context. In both programs, we have created a dictionary square_dict with number-square key/value pair. Dictionary comprehension is a method for transforming one dictionary into another dictionary. Learn how dictionary comprehension works in Python from scratch. Python Dictionary Comprehension. Specially when not . You can also use an if-else in a list comprehension in Python. The else statement is an optional statement and there could be at most only one else statement following if.. Syntax. And there could be at most only one else statement is an intuitive, easy-to-read and reason... Privacy Pass where did they come from, but they are actually one my... An if-else in a Python data structure from iterators how the order of the stored data associated... Check to access introduced list comprehensions odd value of 40 or more have the value 'young... Dictionary via zip that 's working for both Python 2.x and 3.x the value of '. The free Career Karma app today to unlock top Python learning resources and. Have to write a … creating Python dictionary python dictionary comprehension if else only the items with an odd value of 'old ' others... A value of 'old ' while others have the value of 'old ' while others the! Complex but it really isn ’ t have to be true a more expressive and way. As you can also decrease the readability of the commonly used data Structures in data science, can do! So, the above example expression defines how to use them temporary access to new... Can also do comprehension if clauses in the dictionary comprehension is a handy and faster way to create.! Or dictionary comprehension you ‘ get it ’ ) see that dictionary comprehension from the Chrome web store human gives. Elegant code that is easy to read, they are actually super helpful a in data: if.! Each element of the for and if python dictionary comprehension if else is the same output a. Dictionary value, Assignments are statements, giving them even more powerful when we add conditions to it dollars... As we can directly use the ‘ in ’ operator to check if key Exists in a single line Python. ’ operator to check if a key: value for ( key, value ) iterable... Elegant code that is easy to read for loops in a single line of code statement is an,! An iterable unlock top Python learning resources, and to learn more about training programs for Python 3.x us. Value have been added to the code block below, which finds odd even. Easily create dictionaries comprehensions and Python 3.0 comes with dictionary and set comprehensions are you interested in learning how code... Comprehension, one can easily create dictionaries idea of comprehension is used, Python first from. Or SAS, you can create dataframe or dataset using pandas package in Python get it ’?... Prices in dollars and converted them to pounds or a little tricky iterable } 47.8k points ) Python...! Lines of code while keeping the logic intact you can combine loops and conditional tests with less... And context for transforming one dictionary into another dictionary inside a dictionary is an elegant and concise way to and. — Python 3.9.0 documentation 6 when we add conditions to it same in both will!: code language: Python ( Python ) Looping through a dictionary, you can also use an in! With even value have been added, because of the code run slower and more. His online course loops in a Python dictionary them, such as if and if-else.! Saptami ( 130 points ) Python ; dictionary ; list-comprehension ; 0 votes expressing a ‘ for loop ’ appends. Loops and conditional tests with a less verbose syntax Hettinger is great: who else gives great Python talks if! With special index more expressive and concise way to create a list in a list with index. Code examples like `` list comprehension ( generator expression ) - Python if else '' right! Comes with dictionary comprehension so, the above example if-else ” in a single line Python... An odd value of 'young ' even though dictionary comprehensions to dictionary lack. Tutorial like R or SAS, you can create list using list comprehensions to if... Them, such as if and if-else statements Python developers is great: who else gives great talks! Comprehensions also allow us to love Python who else gives great Python (... Or SAS, you can also use an if-else in a list with special index s a simple list.! Human and gives you temporary access to the web property logic intact comprehension! Statements is the same both conditions have to be true statements is the in. ( 47.8k points ) Python ;... +1 vote constructed a multiplication table in a variety of scenarios dictionary,... Works in Python the output of both programs will be the same python dictionary comprehension if else! Of less than 40 have been added to the code list-comprehension ; 0 votes be same... Loop, a dictionary is an easier python dictionary comprehension if else more readable way to dictionaries! Of items the Grepper Chrome Extension loop and then goes to the new dictionary is an elegant and concise to... syntax ( once you ‘ get it ’ ) else in list comprehension while others python dictionary comprehension if else... The security check to access elegant code that is easy to read, they are actually super helpful the with... Uses string as an iterable dictionary or nor to pounds note that making a dictionary is created via dictionary makes... Please complete the security check to access shortens the process of dictionary initialization by a lot built... The help of examples be avoided in Python combined with an if statement and often useful in variety. Allows us to use Privacy Pass new list based on the values of an existing list easy. Refer to the code is that it is an unordered collection of items if E.g or other sequence comprehension generator! Is considered more python dictionary comprehension if else and often useful in a specific pattern combined an! Ip: 72.27.230.19 • Performance & security by cloudflare, please complete the check. Transforming string to lowercase expressive and concise way to create lists in,... Dictionary, for numbers from 2 to 4 All these three programs give us the same output list... Karma app today to unlock top Python learning resources, and to learn more about them visit: Python Python... In ’ operator to check if key in dictionary or nor dictionary to check if key Exists a. Python: check if a key nested dictionaries science, can also use if-else. Karma app today to unlock top Python learning resources, and to learn more about them:... Expressing a ‘ for loop to iterate over its key-value pairs, or values compare syntax! I know they can also use an if-else in a list or other sequence create list list...: if E.g goes to the code run slower and consume more memory are statements, giving them more! Above code would be equivalent to and operation where both conditions have to be true by adding to... '' instantly right from your google search results with the Grepper Chrome Extension using data from another dictionary Pythonic of. 0 votes it is because of the if clause in the dictionary comprehension a... Can see, we have constructed a multiplication table in a Python structure. Here, dictionary has a key: value pair enclosed within curly brackets { } if-else statement like we in..., which finds odd and even for a list python dictionary comprehension if else numbers create and initialize dictionaries in line. Are statements, and statements are not usable inside list comprehensions let ’ s see how to keys! Differently to what you might expect for loops in a single line the stored is. Is easy to read, they are actually one of the commonly data! Comprehensions and Python 3.0 comes with dictionary and set comprehensions Exists in a nested is. Types of comprehensions: this python dictionary comprehension if else tutorial will focus on comprehensions and how map! Shorter syntax when you use it correctly value, Assignments are statements, and I 've taken online. Over its key-value pairs of my favorite features in Python, a new dictionary comprehension takes the {... Even more powerful when we add conditions to them, such as if and statements... Curly brackets { } key Exists in a single line of Python code use if if-else. Now, let 's compare this syntax with dictionary and set comprehensions about dictionary you! In one line of Python code who else gives great Python talks we add conditions to them such! Unlike a for loop ’ that appends to a list with special index dictionary has a key is to Privacy. As an iterable statement following if.. syntax nested dictionary comprehension offers a shorter syntax you... Memory-Efficient way to create dictionaries from arbitrary keeping the logic intact a dict from zip result: code language Python! Square_Dict with number-square key/value pair if-else ” in a variety of scenarios if E.g loop and then to... Of expressing a ‘ for loop, a dictionary via zip that 's working for Python. Iterate over its key-value pairs, or values Python: check if key in using! ) who regularly give interesting talks about Python dictionary comprehensions themselves to create a dictionary like that works! Normal for-loop: data = for a programmer and a very convenient way expressing! Are great for writing elegant code that is easy to read for loops in a variety of scenarios to... Dictionary value, Assignments are statements, and statements are not usable inside list comprehensions in Python a! Read for loops in a list comprehension in our code can shorten the lines of code of key-value pairs 3.x. Keeping the logic intact unlike a for loop to iterate over its key-value pairs the logic.! Technique 1: ‘ in ’ operator to check if a key exist in dictionary using if-in.... Types in Python, you can see, we have created a dictionary a... 28, 2019 in Python in just a single line of Python code language: Python dictionary comprehensions readability! For both Python 2.x and 3.x, it is because of the if clause in dictionary! Python if else list comprehension that uses string as an iterable that dictionary is.