1.5.4 Inheritance

Another important feature of object-oriented languages is inheritance. Classes are arranged in a hierarchical relationship, such that each class inherits its properties and methods from the class above it in the hierarchy (its parent class or superclass). A class also passes along its properties and methods to the class below it (its child class or subclass). A real-world analogy involves the classification of animal species. As a species, we have many characteristics that are unique to humans. However, we also inherit many characteristics from classes higher in the class hierarchy. We have some characteristics as a result of being vertebrates. We have other characteristics as a result of being mammals. To illustrate the point, think of the ability of humans to run. Our bodies respond to our command to run not because we belong to the "human" class, but because we inherit that trait from some class higher in the class hierarchy.

Back in the programming context, the lesson to be learned is that it pays to know where a class fits into the class hierarchy. Without that piece of information, you will be unaware of all of the operations available to you. This information about inheritance can often be found in documentation for the module or the applications API. For example, esri provides the classes for the arcpy Python module here: https://pro.arcgis.com/en/pro-app/latest/arcpy/classes/alphabetical-list-of-arcpy-classes.htm and ArcGIS Pro's SDK for C# here: https://pro.arcgis.com/en/pro-app/latest/sdk/api-reference.