Python For Kids For Dummies by Brendan Scott

Author:Brendan Scott
Language: eng
Format: epub, azw3, mobi
ISBN: 9781119110859
Publisher: Wiley
Published: 2015-08-31T12:40:58+00:00

This is an insanely easy and powerful way to create a new list. List comprehension lets you add conditions as well. This means you can filter out a subset of the elements you’re creating. For example, to get all of the even numbers less than 10, you can add a condition at the end of the list comprehension:

>>> [x for x in range(10) if x%2 == 0]

[0, 2, 4, 6, 8]

Here the condition if x%2 == 0 says that the number is even. On the left side is the modulo operator. It gives the remainder left over after dividing the left side by the right side. (The guessing game project covers this.) If you divide even numbers by 2, the remainder is 0. For each of the even numbers, the if condition will be true and x added. For the odd numbers, it’s false and they’re skipped.

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