How to convert list of list to list of frozenset in original order in python

Question

I have a list of lists and I want to convert to list of frozenset in original order. I've tried the code below but the output isn't in the original order.

data=[[118, 175, 181, 348, 353], [117, 175, 181, 371, 282, 297], [119, 166, 176, 54, 349]]

my code:

>>> transactionList=list()
>>> for rec in data:
      transaction = frozenset(rec)
      transactionList.append(transaction)

output i got is not in original order:

>>> transactionList
    [frozenset([353, 348, 181, 118, 175]), frozenset([297, 175, 371, 181, 282, 117]), frozenset([176, 349, 54, 166, 119])]

my expected output in original order:

>>> transactionList
    [frozenset([118, 175, 181, 348, 353]), frozenset([117, 175, 181, 371, 282, 297]),frozenset([119, 166, 176, 54, 349])]

I there any particular reason you need a `frozenset`? Would a list of tuples, after removing the duplicates but keeping the order, do the job? Tuples are immutable. — timgeb, Mar 27 '16 at 10:18

score 0 · Answer 1 · edited May 23 '17 at 11:46

0

frozensets, like sets, have no defined order. See Does Python have an ordered set? for ways to overcome this with custom classes.

edited May 23 '17 at 11:46

Community

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answered Mar 27 '16 at 07:59

wRAR

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How to convert list of list to list of frozenset in original order in python

1 Answers1