[python] Positional argument v.s. keyword argument

Based on this

A positional argument is a name that is not followed by an equal sign (=) and default value.

A keyword argument is followed by an equal sign and an expression that gives its default value.

def rectangleArea(width, height):
    return width * height

print rectangleArea(width=1, height=2)

Question> I assume that both width and height are positional arguments. Then why can we also call it with the keyword argument syntax?