def get$\_$rectangle$\_$perimeter$($length$,$ width$)$:

$"""$

Return the perimeter of a rectangle

Note: you can assume that length and width are valid numbers

$($either an int or a float$)$

:param length:

:param width:

:return: perimeter of a rectangle $-$ perimeter $=2*$length $+2*$width

$"""$