python list comprehension variable assignment

As mentioned in the above answers there is no direct assignment possible in the list comprehension feature, but there is a hackable way to do it using the exec method to achieve the assignment. Not just assignments we can pas any python expression in exec method to evaluate it.

Starting in Python 3.8, and the introduction of assignment expressions (PEP 572) ( := operator), it's possible to use a local variable within a list comprehension in order to avoid calling the same function twice.

The basic syntax of a list comprehension is: [ <expression> for item in list if <conditional> ] The ‘if’-part is optional, as you’ll discover soon. However, we do need a list to start from. Or, more specifically, anything that can be iterated.

In this tutorial, you’ll learn how to: Rewrite loops and map() calls as list comprehensions in Python. Choose between comprehensions, loops, and map() calls. Supercharge your comprehensions with conditional logic. Use comprehensions to replace filter() Profile your code to resolve performance questions.

Learn how to write list comprehensions in Python, add conditionals such as if and if-else statements, and use nested list comprehensions, all with examples!

Each element of iterable, such as a list or a tuple, is assigned to variable_name and evaluated with expression. A new list is created with the result evaluated by expression as an element. An example of list comprehensions is provided alongside an equivalent for statement.

list_variable = [x for x in iterable] A list, or other iterable, is assigned to a variable. Additional variables that stand for items within the iterable are constructed around a for clause. The in keyword is used as it is in for loops, to iterate over the iterable.

List comprehension offers a concise way to create a new list based on the values of an iterable. In this article, we will learn about Python list comprehensions with the help of examples.

Assignment to multiple variables. List comprehensions can be used to assign values to multiple variables simultaneously. In the example below, we save both the number and its square as a pair in the pairs variables.

This is a proposal for creating a way to assign to variables within an expression using the notation NAME := expr.