In an OrderedDict how to sort by a particular attribute? [closed]

问题

I am trying to sort the following OrderedDict by doing the following-->

>>> from collections import OrderedDict
>>> d = OrderedDict([(4995L, [{'isbn_13': u'9788131805923', 'book_quantity': 49L, 'seller_book_id': 4995L, 'book_id': 4995L, 'title': u'Industrial Automation and Robotics', 'selling_price': 292.0, 'id': 4995L, 'condition': 'New Book'}]), (6657L, [{'isbn_13': u'9788122425925', 'book_quantity': 49L, 'seller_book_id': 6657L, 'book_id': 6657L, 'title': u'A Textbook of Agricultural Statistics', 'selling_price': 243.0, 'id': 6657L, 'condition': 'New Book'}]), (6137L, [{'isbn_13': u'9788122425727\n', 'book_quantity': 50L, 'seller_book_id': 6137L, 'book_id': 6137L, 'title': u'A Guide to Corporate Governance', 'selling_price': 247.0, 'id': 6137L, 'condition': 'New Book'}]), (6260L, [{'isbn_13': u'9788122414394\n', 'book_quantity': 50L, 'seller_book_id': 6260L, 'book_id': 6260L, 'title': u'Management Accounting \n', 'selling_price': 269.0, 'id': 6260L, 'condition': 'New Book'}])])


>>> OrderedDict(sorted(d.items(), key=lambda item: item[1][0]['selling_price']))

by the selling_price attribute. But I am not being able to do it.

I tried to apply the concept discussed in this How to sort OrderedDict of OrderedDict - Python for normal OrderedDict but it did not work. Can someone please help me out?

回答1:

Solution

This should work for the ordered dictionary d:

OrderedDict(sorted(d.items(), key=lambda item: item[1][0]['selling_price']))

Application

>>> d
OrderedDict([(7484,
              [{'book_id': 7484,
                'book_quantity': 43,
                'condition': 'New Book',
                'id': 7484,
                'isbn_13': '9788131727591',
                'seller_book_id': 7484,
                'selling_price': 629.0,
                'title': 'Network Management:  Principles and Practice,  2/e'}]),
             (7485,
              [{'book_id': 7484,
                'book_quantity': 43,
                'condition': 'New Book',
                'id': 7484,
                'isbn_13': '9788131727591',
                'seller_book_id': 7484,
                'selling_price': 29.0,
                'title': 'Network Management:  Principles and Practice,  2/e'}])])

>>> OrderedDict(sorted(d.items(), key=lambda item: item[1][0]['selling_price']))
OrderedDict([(7485,
              [{'book_id': 7484,
                'book_quantity': 43,
                'condition': 'New Book',
                'id': 7484,
                'isbn_13': '9788131727591',
                'seller_book_id': 7484,
                'selling_price': 29.0,
                'title': 'Network Management:  Principles and Practice,  2/e'}]),
             (7484,
              [{'book_id': 7484,
                'book_quantity': 43,
                'condition': 'New Book',
                'id': 7484,
                'isbn_13': '9788131727591',
                'seller_book_id': 7484,
                'selling_price': 629.0,
                'title': 'Network Management:  Principles and Practice,  2/e'}])])

Sorted by 'selling_price': 29.0 is less than 'selling_price': 629.0.

来源：https://stackoverflow.com/questions/34224154/in-an-ordereddict-how-to-sort-by-a-particular-attribute

标签

python

django

python-2.7

ordereddictionary