Sort a defaultdict() by a value in Python3-CodePudding

I have a defaultdict() having data in the following format

Time(Key)  [IP(Value), Count(Value)]

defaultdict(<class 'list'>, {'[03:00]': [['104.194.24.33', 1], ['157.55.39.245', 3], ['17.58.102.43', 3], ['172.20.2.174', 1], ['173.249.54.67', 6], ['178.253.33.51', 6], ['2.177.12.140', 18], ['2.179.141.98', 6], ['2.185.221.79', 1], ['204.18.198.248', 10], ['207.46.13.104', 6], ['207.46.13.115', 7], ['207.46.13.136', 11], ['31.56.96.51', 22], ['34.247.132.53', 1], ['40.77.167.129', 10], ['46.224.77.32', 4], ['5.112.52.254', 2], ['5.160.157.20', 2], ['5.209.200.218', 21], ['5.211.97.39', 36], ['5.62.206.249', 1], ['5.78.180.75', 1], ['5.78.198.52', 16], ['51.15.15.54', 2], ['54.36.148.10', 1], ['54.36.148.117', 1], ['54.36.148.161', 1], ['54.36.148.17', 1], ['54.36.148.18', 1], ['54.36.148.232', 1], ['54.36.148.32', 1], ['54.36.148.87', 1], ['54.36.149.17', 1], ['54.36.149.35', 1], ['54.36.149.41', 1], ['54.36.149.58', 1], ['54.36.149.63', 1], ['54.36.149.70', 1], ['54.36.149.92', 1], ['66.111.54.249', 38], ['66.249.64.66', 1], ['66.249.66.194', 31], ['66.249.66.91', 20], ['89.199.193.251', 1], ['91.99.72.15', 16]]})

and I am trying to sort the the defaultdict() by the second element in the values (i.e. the Count value)

I looked at other posts and tried using

sorted(dct['[03:00]'],key=lambda kv:kv[1], reverse=True)

but it just keeps printing the same dictionary without any sorting. Any help would be kindly appreciated.

CodePudding user response：

Dictionaries before python 3.6(ish?) cannot be sorted because they have no order. If you have python < 3.6, you might want to check out OrderedDict, which can be sorted. For example:

>>> d = OrderedDict([('apple', 2), ('banana', 1)])
>>> d = sorted(d.iteritems(), key=lambda x: x[1])
>>> d
[('banana', 1), ('apple', 2)]

CodePudding user response：

sorted returns the result. You want .sort() if you want the dictionary value to be sorted in place:

from collections import defaultdict

dct = defaultdict(list)
dct['[03:00]'] = [['104.194.24.33', 1], ['157.55.39.245', 3], ['17.58.102.43', 3], ['172.20.2.174', 1], ['173.249.54.67', 6], ['178.253.33.51', 6], ['2.177.12.140', 18], ['2.179.141.98', 6], ['2.185.221.79', 1], ['204.18.198.248', 10], ['207.46.13.104', 6], ['207.46.13.115', 7], ['207.46.13.136', 11], ['31.56.96.51', 22], ['34.247.132.53', 1], ['40.77.167.129', 10], ['46.224.77.32', 4], ['5.112.52.254', 2], ['5.160.157.20', 2], ['5.209.200.218', 21], ['5.211.97.39', 36], ['5.62.206.249', 1], ['5.78.180.75', 1], ['5.78.198.52', 16], ['51.15.15.54', 2], ['54.36.148.10', 1], ['54.36.148.117', 1], ['54.36.148.161', 1], ['54.36.148.17', 1], ['54.36.148.18', 1], ['54.36.148.232', 1], ['54.36.148.32', 1], ['54.36.148.87', 1], ['54.36.149.17', 1], ['54.36.149.35', 1], ['54.36.149.41', 1], ['54.36.149.58', 1], ['54.36.149.63', 1], ['54.36.149.70', 1], ['54.36.149.92', 1], ['66.111.54.249', 38], ['66.249.64.66', 1], ['66.249.66.194', 31], ['66.249.66.91', 20], ['89.199.193.251', 1], ['91.99.72.15', 16]]
dct['[03:00]'].sort(key=lambda kv: kv[1], reverse=True)
print(dct)

Output:

defaultdict(<class 'list'>, {'[03:00]': [['66.111.54.249', 38], ['5.211.97.39', 36], ['66.249.66.194', 31], ['31.56.96.51', 22], ['5.209.200.218', 21], ['66.249.66.91', 20], ['2.177.12.140', 18], ['5.78.198.52', 16], ['91.99.72.15', 16], ['207.46.13.136', 11], ['204.18.198.248', 10], ['40.77.167.129', 10], ['207.46.13.115', 7], ['173.249.54.67', 6], ['178.253.33.51', 6], ['2.179.141.98', 6], ['207.46.13.104', 6], ['46.224.77.32', 4], ['157.55.39.245', 3], ['17.58.102.43', 3], ['5.112.52.254', 2], ['5.160.157.20', 2], ['51.15.15.54', 2], ['104.194.24.33', 1], ['172.20.2.174', 1], ['2.185.221.79', 1], ['34.247.132.53', 1], ['5.62.206.249', 1], ['5.78.180.75', 1], ['54.36.148.10', 1], ['54.36.148.117', 1], ['54.36.148.161', 1], ['54.36.148.17', 1], ['54.36.148.18', 1], ['54.36.148.232', 1], ['54.36.148.32', 1], ['54.36.148.87', 1], ['54.36.149.17', 1], ['54.36.149.35', 1], ['54.36.149.41', 1], ['54.36.149.58', 1], ['54.36.149.63', 1], ['54.36.149.70', 1], ['54.36.149.92', 1], ['66.249.64.66', 1], ['89.199.193.251', 1]]})