human
I wrote the below code

    length = (max((len(str(s)) for s in str_list)) + extra)
    def pad(string):
        string = str(string)
        padding = max(0, (length - len(string)))
        return (string + (padding * '    '))
    return pad

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def padder(str_list, extra=0):