 <ol> <li>Arguments with defaults and splat argument must be grouped together;</li> <li>Splat argument must appear after positional arguments with default values but before keyword arguments;</li> <li>Keyword arguments must appear after positional arguments and before double splat argument;</li> <li><p>Double splat argument must appear last but before block argument.</p> <p>def foo(a, b=1, c=2, *d, e, f: 1, g: 2, **kwargs, &amp;block)</p></li> </ol>