I have a bunch of python classes that are responsible for validating files like so:

java file validator
html file validator
css file validator
javascript file validator

All of these classes define a validate_file(path) and validate_string(string) function.
In the client code of my application, I store all of these validators in an array and I iterate through all of them and call the methods on them in exactly the same way.
Is there a purpose in my case of defining a base "validator" class which defines these methods as abstract? How can I benefit from making these individual classes adhere to the base class? Or maybe in other words, what features would be unlocked if I had a base class with all of these validators implementing it?
Base classes in Python serve to share implementation details and document likenesses. We don't need to use a common base class for things that function similarly though, as we use protocols and duck typing. For these validation functions, we might not have a use for a class at all; Java is designed to force people to put everything inside classes, but if all you have in your class is one static method, the class is just noise. Having a common superclass would enable you to check dynamically for that using isinstance, but then I'd really wonder why you're handling them in a context where you don't know what they are. For a programmer, the common word in the function name is probably enough.
What is the purpose of base classes in Python if you're already referring to the implementation classes consistently