A shallow copy would share the tags list between the original and the clone, so appending to one would change the other. Make clone() perform a true deep copy so nested mutable data is fully independent.
Fix clone() to use copy.deepcopy. After cloning, mutating either side's tags list must not affect the other.
import copy
class Entity:
def __init__(self, name, tags=None):
self.name = name
self.tags = list(tags) if tags is not None else []
def clone(self):
"""Return an independent copy of this entity."""
# TODO: use copy.deepcopy so the tags list is not shared
return copy.copy(self)
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A shallow copy would share the tags list between the original and the clone, so appending to one would change the other. Make clone() perform a true deep copy so nested mutable data is fully independent.
Fix clone() to use copy.deepcopy. After cloning, mutating either side's tags list must not affect the other.
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