英文:
Does unpacking enums at the global scope increase memory usage?
问题
我有一个包含500多行Enum定义的模块，要明确一点，这不仅仅是一个包含500行枚举的模块，而是包含多个Enum。请纠正我，通过解包Enum，我只是创建一个引用吗？
# app/enums.py
import enum
class MyEnum(enum.Enum):
A = 1
B = 2
C = 3
A, B, C = MyEnum.A, MyEnum.B, MyEnum.C
英文:
I have a module that contains a little over of 500 lines of Enum definitions, to be clear it's not just single 500 line enum, but several Enums. Please correct me if I misunderstand, by unpacking the Enum I am only creating a reference?
# app/enums.py
import enum
class MyEnum(enum.Enum):
A = 1
B = 2
C = 3
A, B, C = MyEnum.A, MyEnum.B, MyEnum.C
答案1
得分: 1
它不会使用比其他变量分配更多的内存。分配总是只创建引用，通常在内部只是指针；您需要执行显式复制操作来复制数据。
l = [[1], [2], [3]]
A, B, C = l # 嵌套列表的引用
X, Y, Z = (x.copy() for x in l) # 嵌套列表的副本
英文:
It doesn't use any more memory than any other variable assignments. Assignments always just create references, which are generally just pointers internally; you need to perform an explicit copy operation to duplicate the data.
l = [[1], [2], [3]]
A, B, C = l # references to the nested lists
X, Y, Z = (x.copy() for x in l) # copies of the nested lists
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