When you inherit from both parents but implement the interface as a Python class. The onesie is basically a programmer's birth certificate written in code. Love how the live() method is just an infinite loop of sleeping, yielding to Bardak (probably a parenting framework for diaper changes), and calling be_awesome() . The implementation of be_awesome() ? Just pass . Already awesome by default—no logic needed. That's some solid object-oriented parenting right there. The imports are chef's kiss: import ibtiSam as mom and import boaz as dad . Aliasing your parents like they're npm packages. The class constructor takes both parents' genes as parameters—multiple inheritance done right. And that __init__ printing "hello world!" is probably the most accurate representation of birth ever coded. Baby's first deployment was clearly a success. No exceptions raised, all tests passing, and already in production with that "Welcome home" comment. 10/10 would instantiate again.