In Python:

Create a function that can take an unknown number of dog names and weights as keyword argument pairs. The function should return a list of the names of the dogs sorted by their weight (in ascending order of weight). The function should be named sort_weight. Your function must handle all valid amounts of arguments.

>>> sort_by_weight(Spot=100, Blues_Clues=80, Pluto=200) ['Blues Clues', 'Spot', 'Pluto']