init_test.py

# Base Classes
class BaseAdapter(object):
    def __init__(self):
        super(BaseAdapter, self).__init__()

class BaseAdapter2(object):
    pass

class Second:
    def __init__(self):
        print("second")
        super().__init__()

# Test classes
class Other1(BaseAdapter, Second):
    def __init__(self):
        print("other1 init")
        super().__init__()

class Other2(BaseAdapter2, Second):
    def __init__(self):
        print("other2 init")
        super().__init__()

Other1()
Other2()

output.txt

other1 init
second
other2 init
second