I face a program like following:

class A:
    def __init__(self) -> None:
        pass
        
    def check(self, element):
        if element == 'TypeA':
            self.__validate_TypeA(element)
        if element == 'TypeB':
            self.__validate_TypeB(element)
        if element == 'TypeC':
            self.__validate_TypeC(element)
    
    def __validate_TypeA(self, element):
        # implementation..
        if element.contains('TypeB'):
            self.check('TypeB')
        # implementation...
    def __validate_TypeB(self, element):
        if element.contains('TypeC'):
            self.check('TypeC')
    def __validate_TypeC(self, element):
        if element.contains('TypeA'):
            self.check('TypeA')

    # thousands of codes here...

In this class, methods are depend on each other; In my project, there are half hundreds of Types like ‘TypeA’, ‘TypeB’, and they are coorelated and might call check method in their own implementaion; now my class grows to 4 thousands of lines of code, the maintaining is becoming tricky.

I have tried using inheritence, it does not work out;
I have tried using exec(), built-in, but it will forcefully break the code into multi files, losing the possiblity of using IDE for code highlighting, etc…

So is there a way to do following? :

1. divide my class into multi files,might be one file for one Type implementation
2. do not influence the program strcuture

In C/C++, this could be easiliy accomplished using #include, i do not know how to do it in Python.