Code returning a different result on runestone vs local

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
content

Research direction

Start with the pythonds course's GettingStartedwithData page and reproduce the provided snippet in Runestone and a local Python REPL. Compare the execution context and displayed output; done means the page produces the expected Python behavior or clearly explains any intentional difference.

Written by the indexing model from the issue text.

Description

Error reported in course pythonds on page GettingStartedwithData by user UPS umongia@gmail.com
In the following code when we print(A) after changing the element in myList - A shows the new value whereas if I run the same code on my local or an online REPL, it prints the same value as before for A

myList = [1,2,3,4]
A = [myList]*3
print(A)
myList[2]=45
print(A)

Output in runestone: [[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]]
[[1, 2, 45, 4], [1, 2, 45, 4], [1, 2, 45, 4]]

Output in local: [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]
[1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]

Dominant language
Python
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Forks
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