How many different objects of type list exist in the computer’s memory after the followingcode has been executed? Assume that no garbage collection has been executed and that no optimizationshave been performed.import copya = [1, 2, 3, 9001]b = []for x in a:b = b + [x]c = aa = b[:]b = copy.deepcopy(b)
Question
How many different objects of type list exist in the computer’s memory after the followingcode has been executed? Assume that no garbage collection has been executed and that no optimizationshave been performed.import copya = [1, 2, 3, 9001]b = []for x in a:b = b + [x]c = aa = b[:]b = copy.deepcopy(b)
Solution
After the code has been executed, there are 4 different list objects in the computer's memory. Here's the step-by-step explanation:
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a = [1, 2, 3, 9001]: This creates the first list object in memory. -
b = []: This creates the second list object in memory. -
for x in a: b = b + [x]: This loop creates a new list object in memory for each iteration because the+operation between lists results in a new list. Sinceahas 4 elements, this loop creates 4 new list objects. However, only the final list object (which is equivalent toa) is referenced bybafter the loop ends. The other 3 intermediate list objects are not referenced by any variable. -
c = a: This does not create a new list object. It just creates a new referencecto the existing list object referenced bya. -
a = b[:]: This creates a shallow copy ofb, resulting in the third unique list object in memory. -
b = copy.deepcopy(b): This creates a deep copy ofb, resulting in the fourth unique list object in memory.
So, in total, there are 4 different list objects in the computer's memory after the code has been executed.
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