Keyword Analysis & Research: python class set default values

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Frequently Asked Questions

Where does Python store default member variable values?

Python stores default member variable values in class attributes. Consider this example, not using dataclasses: Note that the two instances of class C share the same class variable x, as expected. This has the same issue as the original example using class C .

Is it possible to set default values for default fields in Python?

However, this is not valid Python. If a parameter has a default value, all following parameters must also have a default value. In other words, if a field in a base class has a default value, then all new fields added in a subclass must have default values as well. Another thing to be aware of is how fields are ordered in a subclass.

How to reset default values in a class?

In view of the context that "the real class has dozens of default values", another approach that you may consider, is to set up a configuration file containing the default values, and using this file to initialize, or reset the defaults. Here is a short example of the first approach using one class variable:

What are Python classes?

Classes ¶. Python classes provide all the standard features of Object Oriented Programming: the class inheritance mechanism allows multiple base classes, a derived class can override any methods of its base class or classes, and a method can call the method of a base class with the same name. Objects can contain arbitrary amounts and kinds of data.

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