django - Sorting Python lists of objects by keys with different names -


i used merge , sort 2 lists of objects both have "created" attributes datetime.

i dit way , worked well:

all_events = sorted(     chain(list1, list2),         key=attrgetter('created'))

now, i'd add 3rd list in sort. problem datetime attribute of objects in 3rd list not named 'created'.

how sort 3 lists in case?

thank you.

use lambda attribute fallback:

all_events = sorted(     chain(list1, list2, list3),     key=lambda o: getattr(o, 'created', getattr(o, 'otherattribute', none))

this try either attribute, preferring 'created'.


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