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An inner class or nested class is a defined entirely within the body of another class. If an object is created using a class, the object inside the root class can be used. A class can have more than one inner classes, but in general inner classes are avoided.
Python老鸟都应该看过那篇非常有吸引力的 Saving 9 GB of RAM with Python’s slots 文章，作者使用了slots让内存占用从25.5GB降到了16.2GB。在当时来说，这相当于用一个非常简单的方式就降低. Like a castle, a class in Python has functions (defs). A castle guards the town. A class guards its data. Classes are an abstraction. slots Magic ¶ In Python every class can have instance attributes. By default Python uses a dict to store an object’s instance attributes. This is really helpful as. slots Magic ¶ In Python every class can have instance attributes. By default Python uses a dict to store an object’s instance attributes. This is really helpful as it allows setting arbitrary new attributes at runtime. Learn how to analyze data using Python. This course will take you from the basics of Python to exploring many different types of data. You will learn how to prepare data for analysis, perform simple statistical analysis, create meaningful data visualizations, predict future trends from data, and more! Topics covered: 1) Importing Datasets 2) Cleaning the Data 3) Data frame.
Related Course:
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Inner class example
We create a class (Human) with one inner class (Head).
An instance is created that calls a method in the inner class:Slot Machine In Python
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Output:
In the program above we have the inner class Head() which has its own method. An inner class can have both methods and variables. In this example the constructor of the class Human (init) creates a new head object.
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Multiple inner classes
You are by no means limited to the number of inner classes, for example this code will work too:
By using inner classes you can make your code even more object orientated. A single object can hold several sub objects. We can use them to add more structure to our programs.
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