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List comprehension in Python provides a concise way to create lists. It consists of brackets containing an expression followed by a for clause, then zero or more for or if clauses. The expressions can be anything, meaning you can put in all kinds of objects in lists.
Example
Here's a simple example that doubles each number in a list:
numbers = [1, 2, 3, 4]doubled = [n * 2 for n in numbers]print(doubled) # Output: [2, 4, 6, 8]Syntax
The basic syntax is [expression for item in list]. If you want to filter items, you can add an if condition at the end: [expression for item in list if condition]1.
Use Cases
Creating a new list by manipulating the elements: For instance, squaring each number in a list.
Filtering items: You can filter items with an if statement. For example, [n for n in numbers if n > 0] will return only positive numbers from the numbers list.
Applying a function to all items: Such as converting all strings in a list to uppercase.
Efficiency
Python - List Comprehension - W3Schools
The condition is like a filter that only accepts the items that valuate to True. The conditionif x != "apple" will return Truefor all elements other than "apple", making the new list contain all fruits except "apple". The conditionis optional and can be omitted: See more
The expressionis the current item in the iteration, but it is also the outcome, which you can manipulate before it ends up like a list item in the new list: You can set … See more
List Comprehension in Python - GeeksforGeeks
Oct 22, 2024 · List comprehension is a way to create lists using a concise syntax. It allows us to generate a new list by applying an expression to each item in an existing iterable (such as a list or range).
Python List Comprehension: Tutorial With Examples
Jun 24, 2024 · A Python list comprehension is a language construct. It’s used to create a Python list based on an existing list.
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Jan 22, 2024 · One of Python’s most distinctive features is the list comprehension, which you can use to create powerful functionality within a single line of code. However, many developers struggle to fully leverage the …
List comprehensions in Python - Oregoom.com
List comprehensions in Python are a quick and efficient way to create lists based on an existing sequence, applying operations or filters to its elements. Through a compact and …
List Comprehension in Python Explained for Beginners
Jul 7, 2021 · List comprehension is an easy to read, compact, and elegant way of creating a list from any existing iterable object. Basically, it's a simpler way to create a new list from the values in a list you already have. It is generally a …
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Comprehensions in Python - GeeksforGeeks
Aug 18, 2023 · Here we use the list comprehensions in Python. It creates a new list named list_using_comp by iterating through each element var in the input_list. Elements are included …
Python List Comprehension (With Examples) - Programiz
List comprehension offers a concise way to create a new list based on the values of an existing list.
List Comprehensions in Python (With Examples and …
May 6, 2020 · A list comprehension is an elegant, concise way to define and create a list in Python. The code is written in a much easier-to-read format. Python List Comprehensions consist of square brackets containing an …
Python - List Comprehension - TutorialsTeacher.com
List comprehension in Python is an easy and compact syntax for creating a list from a string or another list. It is a very concise way to create a new list by performing an operation on …
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