Python Coding Challange - Question with Answer (01190725)

 

Step-by-Step Explanation:

1. Initialize a list:

   
   backpack = [0]

   • A list backpack is created with one item: [0].

2. Call the function:

   
   add_item(backpack)

   • The list backpack is passed to the function add_item.

   • Inside the function, the parameter bag refers to the same list object as backpack.

3. Inside the function:

   
   bag += [1]

   • This modifies the original list in place.

   • += on a list performs in-place addition, equivalent to bag.extend([1]).

   • So bag (and therefore backpack) becomes [0, 1].

4. Print the list:

   
   print(backpack)

   • The backpack list has been changed, so it prints:

     
     [0, 1]

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✅ Output:

[0, 1]

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Key Concept:

• Mutable objects like lists can be modified inside functions.

• Using += on a list modifies the original list in-place.

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