"TIL: One-line list manipulation in Python" was originally published on kevingimbel.de.

TIL: One-line list manipulation in Python

In Python there’s a one-line syntax for iterating over elements of a list. I’ve always found it looked kind-of odd, and as I need to look it up all the time I decided to write a little TIL on this blog about it.

list = [1, 2, 3, 4]
new_list = [num*2 for num in list]

new_list == [2, 4, 6, 8]

#     |--- the function to call on each element
#     |           |--- variable name for each item
#     |           |       |--- the list to work on
#     |           |       |
[func(item) for item in list]

There are more powerful one-liners documented on the Python Wiki.