The purpose of a condition in List Comprehension is to filter out elements from the original list that do not meet a certain criterion. The condition is an optional part of List Comprehension and is represented by an if statement.
The condition is evaluated for each element of the iterable, and only those elements that satisfy the condition are included in the new list. Elements that do not satisfy the condition are skipped.
For example, let's say we have a list of numbers [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], and we only want to create a new list that contains squares of even numbers. We can use List Comprehension with a condition to achieve this as follows:
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
squares_of_evens = [x**2 for x in numbers if x % 2 == 0]
print(squares_of_evens) # Output: [4, 16, 36, 64, 100]
In this example, the if condition x % 2 == 0 checks if the current element is even. If it is even, then the expression x**2 is applied to the current element, and the resulting square is added to the new list squares_of_evens. If the current element is odd, it is skipped and not added to the new list.
Thus, the condition in List Comprehension provides a powerful way to filter out elements from the original list based on a certain criterion, and create a new list with only the desired elements.
