class A:
    def __init__(self, somearg1: int):
        self.arg1 = somearg1

 class B(A):
    def __init__(self, somearg2: int):
        self.arg2 = somearg2

 >> b = B(20)  # only somearg2
Traceback ....
.......
__init__ takes 2 arguments, it was given only 1 (somearg1, somearg2)

 class A:
    def __init__(self, somearg1):
        self.arg1 = somearg1
        
class B(A):
    def __init__(self, somearg1, somearg2):
        super().__init__(somearg1)
        self.arg2 = somearg2
        
b = B(20,30)
print(b.arg1,b.arg2)

 20 30
>>>