Python interview Questions - Oxino Technologies


 

  1. What is Python?

    • Python is a high-level, interpreted programming language known for its simplicity and readability. It emphasizes code readability and allows developers to express concepts in fewer lines of code than languages like C++ or Java.

  2. What are the key features of Python?

    • Some key features include simplicity and readability, easy integration with other languages, extensive standard libraries, and support for object-oriented, imperative, functional, and procedural programming styles.

  3. Explain Python's GIL (Global Interpreter Lock).

    • The Global Interpreter Lock is a mutex that protects access to Python objects, preventing multiple native threads from executing Python bytecodes simultaneously. This means Python threads cannot fully utilize multi-core processors.

  4. What are Python decorators?

    • Decorators in Python are a powerful way to modify or enhance the behavior of functions or methods without changing their source code. They allow functions to be passed as arguments to other functions and returned as values from other functions.

  5. What is the difference between a shallow copy and a deep copy?

    • A shallow copy creates a new object, but instead of copying the objects found in the original, it copies references to those objects. In contrast, a deep copy creates a new object and recursively adds copies of objects found in the original.

  6. Explain list comprehensions in Python.

    • List comprehensions provide a concise way to create lists. They consist of an expression followed by at least one for clause and zero or more if clauses. The expression is evaluated for each item in the sequence(s) specified in the for clause(s).

  7. What is the purpose of the __init__ method in Python classes?

    • The __init__ method is a special method in Python classes. It is called when an object of the class is instantiated. It initializes the object's attributes and performs any necessary setup for the object.

  8. Explain the difference between append() and extend() methods for lists.

    • The append() method adds its argument as a single element to the end of a list. The extend() method, on the other hand, iterates over its argument, adding each element to the list, extending the list.

  9. What is the purpose of the self keyword in Python?

    • self is a convention in object-oriented programming in Python that refers to the instance of the object itself. It is the first parameter of any method in a class and refers to the instance of the class, allowing you to access variables that belong to the class.

  10. How are exceptions handled in Python?

    • Exceptions in Python are handled using the try, except, else, and finally blocks. Code that might raise an exception is placed inside the try block. If an exception occurs, the code in the corresponding except block is executed. The else block is executed if no exceptions are raised, and the finally block is always executed regardless of whether an exception occurred or not.

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