Python 3 set1.update(set2) - reason for different outputs

Question

#my python 3 code

set1 = {"a", "b" , "c"}
set2 = {1, 2, 3}

set1.update(set2)
print(set1)

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{1, 2, 3, 'b', 'c', 'a'}
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{1, 'a', 2, 3, 'c', 'b'}
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{'c', 1, 2, 3, 'b', 'a'}

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I am getting different outputs on every run......can anyone explain its behavior

Answer 1

python sets are unordered and unindexed datatype, the order of the set will not be stable hence the different outputs are produced...