Multi key sort from: https://stackoverflow.com/questions/1143671/python-sorting-list-of-dictionaries-by-multiple-keys

multi_key_sort.py

"""Sort a list of dicts using multiple keys

Also be able to have the different keys sort in different orders
"""

from pprint import pprint

unsorted_data_a = [{'title': 'Foo Beta',
                    'date': '2018-06-03',
                    'value': 5},
                   {'title': 'A Foo',
                    'date': '2018-06-01',
                    'value': 5},
                   {'title': 'Foo Delta',
                    'date': '2018-06-02',
                    'value': 1},
                   {'title': 'Foo',
                    'date': '2018-06-02',
                    'value': 5},
                   {'title': 'Foo Alpha',
                    'date': '2018-06-03',
                    'value': 5},
                   {'title': 'Foo Alpha',
                    'date': '2018-06-03',
                    'value': 3},
                   ]

from operator import itemgetter
from functools import cmp_to_key

def multikeysort(items, columns):
    comparers = [
        ((itemgetter(col[1:].strip()), -1) if col.startswith('-') else (itemgetter(col.strip()), 1))
        for col in columns
    ]
    def cmp(a, b):
        return (a > b) - (a < b)

    def comparer(left, right):
        comparer_iter = (
            cmp(fn(left), fn(right)) * mult
            for fn, mult in comparers
        )
        return next((result for result in comparer_iter if result), 0)
    return sorted(items, key=cmp_to_key(comparer))

# Tests

# Sort on date (desc), then title (asc), then value (asc)
sorted_test1 = multikeysort(unsorted_data_a, ['-date', 'title', 'value'])
pprint(sorted_test1)