Interview Q&A / Python
Python interview questions
Lists, dictionaries, generators, decorators and the Python questions asked in service-company and data roles.
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- What does super() do in Python, and why call super().__init__()?
super() returns a proxy that looks up methods on the next class in the MRO. Calling super().__init__() runs the parent's initialiser so the inherited setup is not skipped. If a child defines __init__ and does not call it, the parent's attributes are never created.
IntermediateQuick answer1 min read - What is the Method Resolution Order (MRO) in Python, and how does it work with multiple inheritance?
The MRO is the order in which Python searches a class and its parents for an attribute. It uses C3 linearization: children come before parents, and the order of bases you wrote is kept. You can see it with ClassName.__mro__ or mro().
AdvancedQuick answer1 min read