Mutable Objects

Question

Mutable Objects

Steve Jones - SSC Editor

SSC Guru

Points: 736418
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April 25, 2018 at 12:05 am

#73755

Comments posted to this topic are about the item Mutable Objects

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IRL11 SSC Veteran Points: 208 More actions · Answer 1

the available answers to the question are incorrect as you are printing J who's value is 1, the answers available are relevant if you print(i) not print(j)

Mighty SSCrazy Eights Points: 9063 More actions · Answer 2

IRL11 - Wednesday, April 25, 2018 3:20 AM
the available answers to the question are incorrect as you are printing J who's value is 1, the answers available are relevant if you print(i) not print(j)

+1

George Vobr SSChampion Points: 10007 More actions · Answer 3

An interesting question and good explanation with useful links, thanks Steve. My first tip was that the value
of the name j would not change, but fortunately in the title of today's QotD is a little help ...😉

timwell SSCertifiable Points: 5315 More actions · Answer 4

IRL11 - Wednesday, April 25, 2018 3:20 AM
the available answers to the question are incorrect as you are printing J who's value is 1, the answers available are relevant if you print(i) not print(j)

Are you looking at the code in the email or in the QOTD page at SSC (after clicking the "Click Here to find out if you are right")

The email has

>>> i = [1,2,3]
>>> j = 1 

but the QOTD page has
>>> i = [1,2,3]
>>> j = i

Steve Jones - SSC Editor SSC Guru Points: 736418 More actions · Answer 5

IRL11 - Wednesday, April 25, 2018 3:20 AM
the available answers to the question are incorrect as you are printing J who's value is 1, the answers available are relevant if you print(i) not print(j)

Where did you see this? The code is
i = [2,3,4]
j= i
i [1] = 4
print(j)

This would show that j is altered as well.

IRL11 SSC Veteran Points: 208 More actions · Answer 6

As Timwell pointed out the examples in the email and the QoTD are different, I must have looked at the example in the email and went looking for the available answer based on that.

Stewart "Arturius" Campbell SSC Guru Points: 72634 More actions · Answer 7

Nice one, thanks Steve
From reading the thread, i'm glad i don't wait for the e-mail before answering

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Junior Galvão - MVP SSCertifiable Points: 6951 More actions · Answer 8

Hi,

Sorry, I believe the correct answer is J=1,2,3, J gets the value of I and after J is printed.

Steve Jones - SSC Editor SSC Guru Points: 736418 More actions · Answer 9

Don't look in the newsletter. There was a typo.

j is assigned i. This means they both point to the same address in memory. When i is changed, j also is changed because it's not a copy, but a pointer.