<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def scourLength(length):
 """ Scours a length. Accepts units. """

    length = SVGLength(length)

    return scourUnitlessLength(length.value) + Unit.str(length.units)