Advanced OOP And Performance

You are utilizing abstract base classes (ABCs). How do you enforce that a subclass implements a specific method?

You need to prevent an object's attribute from being modified after it is set. Which approach provides the most robust implementation?

You have an object that behaves like a function. Which magic method must be implemented to make this possible?

You need to ensure that a class can only be instantiated once throughout the application lifecycle. Which design pattern is most appropriate?

When managing resources like file handles, what is the best practice to ensure they are always closed?

When using inheritance, how can you explicitly call a method from a specific parent class that is not the immediate superclass?

You need to implement a custom class that behaves like a sequence, allowing indexing and length checking. Which magic methods are required?

In a multi-threaded application, you need to ensure that shared state is modified safely. Which tool is the most appropriate for this task?

When writing a metaclass, what is the 'cls' parameter in the __new__ method referring to?

Which THREE of the following are features of the 'threading' module in Python?

Which operator is used to perform bitwise AND operations?

You are handling large datasets and want to improve memory efficiency. Which Python feature allows you to iterate over a large sequence without loading it entirely into memory?

Which magic method is used to define how an object is displayed for developers (for debugging)?

Which keyword is used to raise an exception in Python?

You are designing a class hierarchy where a subclass needs to ensure it calls the constructor of its parent in a multiple inheritance scenario. Which mechanism is the standard Pythonic approach to handle this dynamically?

Which TWO of the following are valid ways to create a generator in Python?

You need to ensure that a method can be called on the class directly, without requiring an instance. Which decorator should be used?

Which TWO of the following are true about the 'descriptor protocol' in Python?

You need to compare two objects for equality based on a custom attribute. Which method should you override?

When writing a context manager using the @contextlib.contextmanager decorator, what should the function do to pass a value to the 'as' clause?

You are using 'slots' to save memory. What is a significant side effect of defining __slots__ in a class?

You want to store an object in a set. What must the object implement?

You are profiling your code and identify that a specific method is called millions of times. You decide to use a descriptor to optimize attribute access. What must the descriptor implement to intercept attribute assignment?

When optimizing Python code, which tool should you use to identify hot spots in the execution path?

Which TWO of the following are Python object-oriented concepts?

Which THREE of the following are true about Python metaclasses?

You have a performance-critical application using heavy objects. You want to reduce memory footprint by preventing the creation of __dict__ for every instance. How should you proceed?

You need to dynamically add methods to a class at runtime. Which mechanism allows you to modify the class object before it is fully constructed?

Which built-in function allows you to retrieve an attribute from an object by its string name?

Which THREE of the following can be used to improve the performance of a Python application?

Which TWO of the following statements about the Python Method Resolution Order (MRO) are true?

Which THREE of the following are benefits of using __slots__?