add vs update in set operations in python - in case of String

Asked Sep 30 '18 at 02:24

Active Sep 30 '18 at 02:31

Viewed 667 times

I am new to python, When I am trying to add or update the String element in set it's behaving strangely.

dummySet={10,20,30}
type(dummySet)
<class 'set'>
dummySet.add('Adam')
{10, 20, 30, 'Adam'}#Here it is adding a whole word, when I do add operation.
dummySet.update('Eve')
{'E', 10, 'Adam', 20, 'e', 'v', 30}#It is adding all character as element in the set.

I had tried over the google also but havn't got the clear explanation on this.

Can any one explain why this is behaving or reason behind this.

edited Sep 30 '18 at 02:31

cs95

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asked Sep 30 '18 at 02:24

SaviNuclear

`.update` takes a iterable and adds all the items in the iterable. `.add` takes a single item and adds it to the set. `str` objects are iterable – juanpa.arrivillaga Sep 30 '18 at 02:27
try dummySet.update( ['Eve'] ) – Todd Sep 30 '18 at 02:28
@RedCricket In that they are trying to access the integer type. – SaviNuclear Sep 30 '18 at 02:32
1

The explanation is the same. – juanpa.arrivillaga Sep 30 '18 at 02:34
@coldspeed @Red Cricket @juanpa.arrivillaga As per the explanation the argument has to be hashables, but here in `add` and `update` method it will be hashables, so how it's behaving differently. Please explain the difference because that clarity is not present with the respect of `String`. If you can't then remove the duplicate flag from this question. – SaviNuclear Sep 30 '18 at 03:12
As I explained in my first comment, update exprects an *iterable* – juanpa.arrivillaga Sep 30 '18 at 20:36

add vs update in set operations in python - in case of String

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