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Python Interview Questions

  • How would you describe Python?
    Python is a popular and widely used programming language that can be used for various applications such as web development, data analysis, machine learning, scripting, automation, and more. Python is designed to be easy to read, write, and learn, and has a large and active community of developers and users.
    How does Python execute its source code? Is it fully interpreted or partly compiled?
    Python is a hybrid language, meaning that it combines features of both compiled and interpreted languages. Python source code is first compiled into byte code, which is a low-level representation of the program, and then executed by a virtual machine. This gives Python some advantages of compiled languages, such as faster execution and error detection, as well as some advantages of interpreted languages, such as portability and flexibility.
    What are the main differences between lists and tuples as data types in Python?
    Lists and tuples are both ordered collections of items, but lists are enclosed in square brackets [ ], while tuples are enclosed in parentheses ( ). Lists support operations such as appending, inserting, deleting, and sorting, while tuples do not. Lists are more suitable for dynamic and variable data, while tuples are more suitable for fixed and constant data.
    What is pep 8?
    PEP 8 is the standard coding style for Python, which specifies the rules and recommendations for formatting, naming, spacing, indentation, comments, and other aspects of Python code. PEP 8 aims to improve the quality, readability, and maintainability of Python code, and to promote a common coding style among Python developers.
    What are some of the characteristics and advantages of Python as a programming language?
    Python has many features that make it a powerful and popular programming language, such as: easy to learn and use, supports multiple programming styles, such as object-oriented, functional, procedural, and imperative, dynamically typed, meaning variables do not need to be declared or have a fixed type, manages memory automatically, freeing the programmer from manual allocation and de - allocation, has a rich set of built-in data types and functions, as well as a vast collection of modules and packages that provide additional functionality, runs on various operating systems and platforms, such as Windows, Linux, Mac OS, and Android, has an interactive shell that allows the user to execute Python code and see the results immediately, and has a large and active community of developers and users that contribute to the development and improvement of the language.
    What are the techniques and mechanisms that Python uses to allocate and de-allocate memory for its objects?
    Python uses an automatic memory management system that frees the programmer from the burden of manual memory allocation and de-allocation. Python objects are stored in a private heap space that is managed by the Python Memory Manager. The Python Memory Manager allocates memory for new objects and releases memory for unused objects using various techniques, such as reference counting, which tracks the number of references to each object and deletes the object when the reference count reaches zero, garbage collection, which periodically scans the heap for objects that are not reachable from the root set and collects them, and memory pools, which divide the heap into fixed-size blocks and reuse them for similar-sized objects.
    What is the role and function of the PYTHONPATH environment variable in Python?
    PYTHONPATH is a system variable that tells the Python interpreter where to look for modules and packages that are not in the standard library. PYTHONPATH can be set by the user to include additional directories that contain custom or third-party modules and packages. PYTHONPATH is a colon-separated list of directories on Unix-like systems, and a semicolon-separated list of directories on Windows systems.
    How are modules and libraries related and different as code organization units in Python?
    Modules and libraries are both collections of reusable code in Python, but modules are single files that contain Python definitions and statements, while libraries are directories that contain multiple modules and subdirectories.
    How does Python store and manage the names and values of its objects using namespaces?
    Python namespaces are containers that hold the names and references of Python objects, such as identifiers, keywords, literals, etc. Namespaces provide a way to organize and manage the names and symbols used in a Python program, and to control their visibility and lifetime.
    What is the concept and purpose of inheritance in Python, and what are the different forms of inheritance that Python supports? Give an example for each form.

    Inheritance is a mechanism that allows a class to inherit the attributes and methods of another class, and to modify or extend them as needed. Inheritance enables code reuse and polymorphism, which means that the same method can behave differently depending on the class or object that calls it. In Python, there are different types of inheritance, such as single inheritance, where a class inherits from one parent class, multiple inheritance, where a class inherits from more than one parent class, multilevel inheritance, where a class inherits from a parent class that also inherits from another class, and hierarchical inheritance, where more than one class inherits from a common parent class. For example:


    ```python

    # Single inheritance

    class Animal: # Parent class

        def __init__(self, name):

            self.name = name

        def eat(self):

            print(self.name, "is eating")


    class Dog(Animal): # Child class

        def __init__(self, name, breed):

            super().__init__(name) # Calling the parent class constructor

            self.breed = breed

        def bark(self):

            print(self.name, "is barking")


    dog = Dog("Max", "Labrador")

    dog.eat() # Inherited method from Animal class

    dog.bark() # Method defined in Dog class


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