PCPP-32-101 1.10 Perform Shallow and Deep Copy Operations PCPP-32-1 Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A developer debugs a memory leak in a long-running service. The code maintains a list of processed request objects. After processing, the developer sets request = None but the memory usage keeps growing. Investigation shows the request objects are still referenced elsewhere. Which statement correctly explains the situation?

   • ASetting request = None destroys the object immediately.
   • BThe id() of the object changes when the label is set to None.
   • CThe object's value is cleared but its identity remains.
   • DSetting request = None only removes one label; other references to the same object keep it alive.
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2. 12expert · hard

   A developer maintains a configuration system where a base configuration contains a nested dictionary of feature flags. The developer creates config_copy = base_config.copy() and then modifies a feature flag via config_copy['features']['dark_mode'] = True. The developer is surprised to find the base configuration also changed. What is the most accurate explanation?

   • AThe copy() method shares nested dictionaries, so modifying a nested value through the copy also modifies the base.
   • BThe assignment operator = inside the nested dictionary triggers a deep copy.
   • CThe base_config and config_copy are the same object because copy() returns self.
   • DThe copy() method is broken and does not create a new object.
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4. 13foundation · easy

   In Python, a variable name such as `x` is best described as which of the following?

   • AA container that stores the object's value
   • BA fixed memory address that never changes
   • CA label that refers to an object in memory
   • DThe object's unique identity number
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5. 14foundation · easy

   After `a = [[1, 2], 3]` and `b = a.copy()`, what happens if you modify `b[0][0] = 99`?

   • ABoth `a` and `b` are affected because they share the nested list
   • BOnly `a` is affected; `b` remains unchanged
   • COnly `b` is affected; `a` remains unchanged
   • DAn error occurs because you cannot modify a copied list
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6. 15foundation · easy

   Which statement correctly distinguishes an object's identity from its value?

   • AIdentity is unique for each object; value is the data the object holds
   • BIdentity is the same for all objects with equal values
   • CIdentity and value are always the same for immutable objects
   • DValue is unique for each object; identity is the data it holds
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