Python Coding Challange - Question with Answer (01081025)

 

 Step-by-step explanation:

1. a = [10, 20, 30]
   → Creates a list in memory: [10, 20, 30].

2. b = a
   → b does not copy the list.
   It points to the same memory location as a.
   So both a and b refer to the same list.

3. b += [40]
   → The operator += on lists means in-place modification (same as b.extend([40])).
   It adds 40 to the same list in memory.

4. Since a and b share the same list,
   when you modify b, a also reflects the change.

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✅ Output:

[10, 20, 30, 40]

 
 Key Concept:

• b = a → same object (shared reference)

• b = a[:] or b = a.copy() → new list (independent copy)

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