python.lang/a06.py · aliao/stdpython

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stdpython

python.lang

a06.py

a06.py 876 Bytes

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pish7 authored 2025年11月30日 16:41 +08:00 . python

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import copy


class Taco:
 def __init__(self, toppings):
 self.ingredients = copy.copy(toppings) # 浅复制

 def add_sauce(self, sauce):
 self.ingredients.append(sauce)


default_toppings = ["Lettuce", "Tomato", "Beef"]
# 由于构造函数中使用浅复制,对象内部的 ingredients 有单独的副本,而且不会指向 default_toppings
mild_taco = Taco(default_toppings)
hot_taco = Taco(default_toppings)
hot_taco.add_sauce("Salsa")

print(mild_taco.ingredients)
print(hot_taco.ingredients)


default_toppings = ["Lettuce", "Tomato", "Beef"]
mild_taco = Taco(default_toppings)
# 这里需要使用深复制来复制对象
# 否则复制出来的对象的 ingredients 与 mild_taco.ingredients 将会指向同一个数据
hot_taco = copy.deepcopy(mild_taco)
hot_taco.add_sauce("Salsa")

print(mild_taco.ingredients)
print(hot_taco.ingredients)