Good day.
I am learning Python by video lectures, I have reached sets, the example mentions the union method
a.union and
a.update What is the fundamental difference?
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1 answer
union as a result returns a new set without changing the source, and update returns nothing, but adds elements of the second to the first set.
>>> a = set([1,2,3]) >>> b = set([2,3,4]) >>> print a.union(b) set([1, 2, 3, 4]) >>> print a set([1, 2, 3]) >>> print b set([2, 3, 4]) >>> a = set([1,2,3]) >>> b = set([2,3,4]) >>> print a.update(b) None >>> print a set([1, 2, 3, 4]) >>> print b set([2, 3, 4]) 
Vitalina
eleven one 2 eight
LinnTroll LinnTroll
4,156 eleven 15
- That is, when creating (union) a new set, an additional memory is allocated? and with (update) get less memory consumption? - nisa
- I'm not ready to answer what exactly happens in the interpreter, but most likely it is. When creating a new set with the help of the union, a new object will be created exactly and will take up memory. - LinnTroll pm
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