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Save memory with "slots"

If you have ever written a program that creates a large number of instances of some kind, you may have noticed that your program suddenly needs a lot of memory. That's because Python uses dictionaries to represent the properties of class instances, which makes it fast, but not very efficient in memory use. Usually, this is not a serious problem. However, if your program is seriously affected by this, try "slots":

Class Person: _ _ slots__ = ["first_name", "last_name", "phone"] def _ _ init__ (self, first_name, last_name, phone): self.first_name = first_name self.last_name = last_name self.phone = phone

When we define the "slots" attribute, Python does not use a dictionary to represent the attribute, but uses a small fixed-size array, which greatly reduces the memory required for each instance. There are some drawbacks to using "slots": we cannot declare any new properties, we can only use existing properties on "slots". Also, classes with "slots" cannot use multiple inheritance.

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