python slot

最新推荐文章于 2025-03-02 09:49:24 发布

转载最新推荐文章于 2025-03-02 09:49:24 发布 · 109 阅读

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原文链接：http://www.cnblogs.com/sooflow/p/6202619.html

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#python

通过定义__slots__，可以显著减少Python类实例占用的内存，并限制实例动态添加属性的可能性。这种方式尤其适用于主要作为简单数据结构使用的类。

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使用slot能降低内存使用，同时也不能对实例新增属性。

For classes that primarily serve as simple data structures, you can often greatly reduce the memory footprint of instances by adding the __slots__ attribute to the class defi‐ nition. For example:

class Date:
__slots__ = ['year', 'month', 'day'] def __init__(self, year, month, day):

            self.year = year
            self.month = month
            self.day = day

When you define __slots__, Python uses a much more compact internal representation for instances. Instead of each instance consisting of a dictionary, instances are built around a small fixed-sized array, much like a tuple or list. Attribute names listed in the __slots__ specifier are internally mapped to specific indices within this array. A side effect of using slots is that it is no longer possible to add new attributes to instances— you are restricted to only those attribute names listed in the __slots__ specifier

转载于:https://www.cnblogs.com/sooflow/p/6202619.html