12/20/2023 0 Comments List comprehension pythonWhen and why should we use List Comprehension in Python? This is the condition to check whether the number is even or not. In our example, the last part inside the list comprehension is the condition. We write it using Python conditional statements i.e., if-else. ConditionĪs the name suggests Condition will be just a condition, we want our elements to satisfy. In our example, the old_list is the iterable we are using for comprehension. For our new list, we will be considering all the members of this iterable. This will be the collection from which we are creating or defining our new list. It can be a list, tuple, string, set, etc., or a function (like range()) that generates a sequence. IterableĪs we know an iterable refers to the sequence of Python objects. ![]() It may be as simple as just a single variable or it could include more than one variable and operators as well. We call it an expression because we write it in a form of an expression. We get an expression from the member of the iterable itself. Since here we want to insert square of elements, we have defined our expression as x ** 2. In our example, the first part of list comprehension ( x ** 2 ) is said to be the Expression.Įxpression is nothing but the item we want to insert in our new list. Now with the help of the above example let’s discuss all three elements. #creating new list using list comprehension Here, we want to have square of all even numbers from the old list. We will be creating a new list from an existing list containing some integer values. Before we discuss these three elements let’s see an example. Syntax :– new_list = Īs we can see from the syntax, list comprehension in Python includes three elements, an expression, iterable, and a condition. List comprehensions are defined inside square brackets. How to define List Comprehension in Python?
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