An example is given in PEP 8:
class Rectangle(Blob):
def __init__(self, width, height,
color="black", emphasis=None, highlight=0):
So that is the official answer. Personally I detest this approach, in which continuation lines have leading whitespace that doesn’t correspond to any real indentation level. My approach would be:
class Rectangle(Blob):
def __init__(
self, width, height,
color="black", emphasis=None, highlight=0
):
. . . or just let the line run over 80 characters.