Initialize complex nested lists in Python in many lines?

Question

Python requires indenting. So, how to initialize complex nested objects inline?

Should I write them in one long line

rewards = [[-0.04, -0.04, -0.04, -0.04], [-0.04, 0, -0.04, -0.04], [-0.04, -0.04, -0.04,-0.04]]

Or can I wrap them somehow?

UPDATE

My question is not about breaking long lines, which is clearly written in documentation, but about breaking long lines in case of defining complex nested structures, like list of lists of dictionaries of lists. I was unable to beleive we should use line continutaion syntax here.

UPDATE 1

No it's not a duplicate.

Answer 1

One way is to use:

rewards = [
    [-0.04, -0.04, -0.04, -0.04],
    [-0.04, 0, -0.04, -0.04],
    [-0.04, -0.04, -0.04,-0.04]
]

Note that any whitespace within a list for separating elements is redundant, as the lexer will remove it; so this is simply a matter of readability as per one's taste.

You could write it in one line, however, you will very easily hit the 80 char limit when doing so with long nested lists, and I personally don't find that representation reader friendly.

Answer 2

Inside parenthesis, including [, {, and (, you can use any formatting you want.