If/Else in a List Comprehension

Better Stack Team
Updated on June 19, 2024

You can use if/else statements in a list comprehension to conditionally include elements in the resulting list. The syntax for this is:

[expression_if_true if condition else expression_if_false for item in iterable]

Here's an example:

# List comprehension with if/else
numbers = [1, 2, 3, 4, 5]
new_numbers = [x if x % 2 == 0 else x * 2 for x in numbers]

print(new_numbers)  # Output: [2, 2, 6, 4, 10]

In this example, the list comprehension doubles each odd number and leaves even numbers unchanged.

You can also use nested if/else statements for more complex conditions:

# List comprehension with nested if/else
numbers = [1, 2, 3, 4, 5]
new_numbers = [x if x % 2 == 0 else x * 2 if x < 4 else x * 3 for x in numbers]

print(new_numbers)  # Output: [2, 2, 6, 12, 15]

In this example, if the number is less than 4, it doubles odd numbers; otherwise, it multiplies them by 3.

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