all_variables_name_printer.py

class AllVariablesNamePrinter:
    def __init__(self):
        self.a = 10
        self.b = {
            "ba": 1,
            "bb": 2,
        }
        self.c = 20

    def __call__(self):
        print('> start')
        [(print(x) if(x!=None) else None) for x in [(attr if(attr.startswith('__')==False) else None) for attr in dir(self)]]
        print('> end')

if(__name__=='__main__'):
    AllVariablesNamePrinter()()

def all_variables_name_printer(cls: 'self') -> None:
    [(print(x) if(x!=None) else None) for x in [(attr if(attr.startswith('__')==False) else None) for attr in dir(cls)]]

def all_variables_name_printer(cls: 'self') -> None:
    print(cls.__dict__)

Thanks himako-san.