Python Coding Challange - Question With Answer(01280125)

 

Explanation:

1. numbers = [1, 2, 3]
   • A list [1, 2, 3] is created and assigned to the variable numbers.
2. integers = numbers
   • The variable integers is assigned the same reference as numbers.
   • At this point, both integers and numbers refer to the same list in memory: [1, 2, 3].
3. numbers = numbers + [4, 5, 6]
   • The numbers + [4, 5, 6] creates a new list: [1, 2, 3, 4, 5, 6].
   • This new list is assigned back to the variable numbers.
   • Now, numbers refers to a new list [1, 2, 3, 4, 5, 6], but integers still refers to the original list [1, 2, 3] because it was not updated or modified.
4. print(integers)
   • The variable integers still refers to the original list [1, 2, 3], which remains unchanged.
   • So, the output is:

     
     [1, 2, 3]

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Key Takeaway:

• The operation numbers = numbers + [4, 5, 6] creates a new list and reassigns it to numbers. It does not modify the original list numbers was referring to.
• If you want to modify the list in place, you can use numbers.extend([4, 5, 6]). In that case, integers would also reflect the changes since they share the same reference.