- []

# List comprehension - double

We take the original example where we had a function called double, and this time we
write a different expression to run the function on every element of an iterable.

**examples/functional/list_comprehension_double.py**

def double(n): return 2*n numbers = [1, 2, 3, 4] name = "FooBar" double_numbers = [double(n) for n in numbers] print(double_numbers) # [2, 4, 6, 8] double_chars = [double(n) for n in name] print(double_chars) # ['FF', 'oo', 'oo', 'BB', 'aa', 'rr']