>>> ["Even" if i%2==0 else "Odd" for i in range(8)] Let's look at an example. 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. What is Dictionary Comprehension in Python? Generator Expressions vs. Skip to content. Dict comprehensions can use complex expressions and IF-ELSE constructs too. Python Dictionary Comprehensions become even more powerful when we add conditions to them, such as if and if-else statements. Python dictionary comprehension if else. Watch Now. Like List Comprehension, Python allows dictionary comprehensions. using sequences which have been already defined. With comprehensions, you can combine loops and conditional tests with a less verbose syntax. A comprehension is a compact way of creating a Python data structure from iterators. In this tutorial, we will learn about Python dictionary comprehension and how to use it with the help of examples. In Python, dictionary is a data structure to store data such that each element of the stored data is associated with a key. 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 The keys must be unique and immutable. Python Basics Video Course now on Youtube! A dictionary is an unordered collection of key-value pairs. What makes them so compelling (once you ‘get it’)? 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 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 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. From the above example, we can see that dictionary comprehension should be written in a specific pattern. Each entry has a key and value. Python Dictionary Comprehensions become even more powerful when we add conditions to them, such as if and if-else statements. We need to specify what the output is first, following “if” condition and then “else” followed by what is the output under “else.” The keys must be unique and immutable. They can also decrease the readability of the code. They can help make your programs easier to read and easier to maintain, once you’ve actually wrapped your head around how they work. using sequences which have been already defined. 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. Otherwise, convert text to lowercase. 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. 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. If you’re interested in learning about dictionary comprehensions, read our guide to Python dictionary comprehension. The items with a value of 40 or more have the value of 'old' while others have the value of 'young'. 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. Nested Dictionary Comprehension. >>> ["Even" if i%2==0 else "Odd" for i in range(8)] Your IP: 72.27.230.19 It consists of two parts: expression and context. Without list comprehension you will have to write a … 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.