Ordering a list of dictionaries in python

Question

I've got a python list of dictionaries:

mylist = [
{'id':0, 'weight':10, 'factor':1, 'meta':'ABC'},
{'id':1, 'weight':5, 'factor':1, 'meta':'ABC'},
{'id':2, 'weight':5, 'factor':2, 'meta':'ABC'},
{'id':3, 'weight':1, 'factor':1, 'meta':'ABC'}
]

Whats the most efficient/cleanest way to order that list by weight then factor (numerically). The resulting list should look like:

mylist = [
{'id':3, 'weight':1, 'factor':1, 'meta':'ABC'},
{'id':1, 'weight':5, 'factor':1, 'meta':'ABC'},
{'id':2, 'weight':5, 'factor':2, 'meta':'ABC'},
{'id':0, 'weight':10, 'factor':1, 'meta':'ABC'},
]

Answer 1

mylist.sort(key=lambda d: (d['weight'], d['factor']))

or

import operator
mylist.sort(key=operator.itemgetter('weight', 'factor'))