Created
August 29, 2012 03:49
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Multi Level sorting example in Python
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#!/usr/bin/env python | |
## An alternative approach for sorting list of dicts by multiple | |
## levels of criteria | |
## Original example: http://sleepythread.blogspot.in/2012/08/sorting-hash-on-more-than-one-key-with.html | |
import pprint | |
pp = pprint.PrettyPrinter(indent=4) | |
def compare_two(p, q, direction='asc'): | |
if direction == 'desc': | |
p, q = q, p | |
if p < q: | |
return -1 | |
elif p > q: | |
return 1 | |
else: | |
return 0 | |
def comparator(a, b): | |
cmp_age = compare_two(a['age'], b['age']) | |
if cmp_age != 0: | |
return cmp_age | |
cmp_height=compare_two(a['height'], b['height'], 'desc') | |
if cmp_height != 0: | |
return cmp_height | |
return compare_two(a['weight'], b['weight']) | |
students = [{'sno': 1, 'age': 10, 'weight': 130, 'height': 170}, | |
{'sno': 2, 'age': 8, 'weight': 130, 'height': 170}, | |
{'sno': 3, 'age': 8, 'weight': 110, 'height': 180}, | |
{'sno': 4, 'age': 8, 'weight': 110, 'height': 170}, | |
{'sno': 5, 'age': 7, 'weight': 130, 'height': 170}] | |
pp.pprint(sorted(students, cmp=comparator)) | |
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