List comprehensions are a method for taking a list of elements and performing a transformation on each element.
In our first example, we want to take numbers 0-9, square them, and have the result end up in a list.
ln[5] shows how you would perform this task using for a loop to iterate.
ln[1] does the same thing, but it does it in one line.
Try your code in our online Python console:
As you can see, the list comprehension basically crunches the for loop into one line. The syntax is simple enough:
S = [x**2 for x in range(10)]
Assign a variable = [operation for loop]
Find even numbers in a list:
Here we add an if statement inside the iteration. (x%2 is modulus, meaning it returns remainder. So 4%2 returns a remainder of 0 and 5%2 returns are remainder of 1)
You can use list comprehensions with more complex formulas:
You can even use functions from within a list comprehension
Try your code in our online Python console:
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